At the Large Hadron Collider, the $WbWb$ final state is expected to be dominated by $t\bar{t}$ production with a contribution from single-top processes. Differential cross-sections for $WbWb$ production in the dilepton decay channel are measured at the particle level as a function of various kinematic variables. The analysis is based on data from proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 13$ TeV, recorded by the ATLAS detector at the Large Hadron Collider over the period from 2015 to 2018, corresponding to an integrated luminosity of 140 fb$^{-1}$. Measurements are performed within the fiducial phase-space defined by the presence of two $b$-jets and one electron and one muon of opposite charges. The differential cross-sections are corrected for detector effects and unfolded to the particle level. Results are compared with predictions from Monte Carlo event generators at next-to-leading order in perturbative quantum chromodynamics. These measurements provide valuable constraints on the modelling of $WbWb$ production and the interference between doubly resonant and singly resonant $WbWb$ production.
- - - - - - - - Overview of HEPData Record - - - - - - - - <br/><br/> <b>Fiducial phase space definitions:</b><br/> <i>Exclusive:</i> <ul> <li> NLEP = 2, EMU, PT > 28 GeV, ABS ETA < 2.5 <li> NJETS >= 2, PT > 25 GeV, ABS ETA < 2.5 <li> NBJETS = 2 </ul><br/> <i>Inclusive:</i> <ul> <li> NLEP = 2, EMU, PT > 28 GeV, ABS ETA < 2.5 <li> NJETS >= 2, PT > 25 GeV, ABS ETA < 2.5 <li> NBJETS >= 2 </ul><br/> <b>Measurements:</b><br/> <i>Exclusive:</i><br/> Spectra: <ul> <li>DSIG/DM_BL_MINIMAX (<a href="159379?table=Table 1">Table 1</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (<a href="159379?table=Table 4">Table 4</a> ) <li>SIG (<a href="159379?table=Table 7">Table 7</a> ) </ul><br/> Data statistical covariances: <ul> <li>DSIG/DM_BL_MINIMAX (<a href="159379?table=Table 2">Table 2</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (<a href="159379?table=Table 5">Table 5</a> ) <li>SIG (<a href="159379?table=Table 8">Table 8</a> ) </ul><br/> MC statistical covariances: <ul> <li>DSIG/DM_BL_MINIMAX (<a href="159379?table=Table 3">Table 3</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (<a href="159379?table=Table 6">Table 6</a> ) <li>SIG (<a href="159379?table=Table 9">Table 9</a> ) </ul><br/> <b>Particle level:</b><br/> <i>Inclusive:</i><br/> Spectra: <ul> <li>DSIG/Dn_JETS (<a href="159379?table=Table 10">Table 10</a> ) <li>1/SIG*DSIG/Dn_JETS (<a href="159379?table=Table 13">Table 13</a> ) <li>DSIG/DM_BBLL (<a href="159379?table=Table 16">Table 16</a> ) <li>1/SIG*DSIG/DM_BBLL (<a href="159379?table=Table 19">Table 19</a> ) <li>DSIG/DMT_BB4L (<a href="159379?table=Table 22">Table 22</a> ) <li>1/SIG*DSIG/DMT_BB4L (<a href="159379?table=Table 25">Table 25</a> ) <li>DSIG/DPT_BB (<a href="159379?table=Table 28">Table 28</a> ) <li>1/SIG*DSIG/DPT_BB (<a href="159379?table=Table 31">Table 31</a> ) <li>DSIG/DPT_J1 (<a href="159379?table=Table 34">Table 34</a> ) <li>1/SIG*DSIG/DPT_J1 (<a href="159379?table=Table 37">Table 37</a> ) <li>DSIG/DPT_J2 (<a href="159379?table=Table 40">Table 40</a> ) <li>1/SIG*DSIG/DPT_J2 (<a href="159379?table=Table 43">Table 43</a> ) <li>DSIG/DPT_L1 (<a href="159379?table=Table 46">Table 46</a> ) <li>1/SIG*DSIG/DPT_L1 (<a href="159379?table=Table 49">Table 49</a> ) <li>DSIG/DPT_L2 (<a href="159379?table=Table 52">Table 52</a> ) <li>1/SIG*DSIG/DPT_L2 (<a href="159379?table=Table 55">Table 55</a> ) <li>DSIG/DPT_BB4L (<a href="159379?table=Table 58">Table 58</a> ) <li>1/SIG*DSIG/DPT_BB4L (<a href="159379?table=Table 61">Table 61</a> ) <li>DSIG/DPT_BBLL (<a href="159379?table=Table 64">Table 64</a> ) <li>1/SIG*DSIG/DPT_BBLL (<a href="159379?table=Table 67">Table 67</a> ) <li>SIG (<a href="159379?table=Table 70">Table 70</a> ) </ul><br/> Data statistical covariances: <ul> <li>DSIG/Dn_JETS (<a href="159379?table=Table 11">Table 11</a> ) <li>1/SIG*DSIG/Dn_JETS (<a href="159379?table=Table 14">Table 14</a> ) <li>DSIG/DM_BBLL (<a href="159379?table=Table 17">Table 17</a> ) <li>1/SIG*DSIG/DM_BBLL (<a href="159379?table=Table 20">Table 20</a> ) <li>DSIG/DMT_BB4L (<a href="159379?table=Table 23">Table 23</a> ) <li>1/SIG*DSIG/DMT_BB4L (<a href="159379?table=Table 26">Table 26</a> ) <li>DSIG/DPT_BB (<a href="159379?table=Table 29">Table 29</a> ) <li>1/SIG*DSIG/DPT_BB (<a href="159379?table=Table 32">Table 32</a> ) <li>DSIG/DPT_J1 (<a href="159379?table=Table 35">Table 35</a> ) <li>1/SIG*DSIG/DPT_J1 (<a href="159379?table=Table 38">Table 38</a> ) <li>DSIG/DPT_J2 (<a href="159379?table=Table 41">Table 41</a> ) <li>1/SIG*DSIG/DPT_J2 (<a href="159379?table=Table 44">Table 44</a> ) <li>DSIG/DPT_L1 (<a href="159379?table=Table 47">Table 47</a> ) <li>1/SIG*DSIG/DPT_L1 (<a href="159379?table=Table 50">Table 50</a> ) <li>DSIG/DPT_L2 (<a href="159379?table=Table 53">Table 53</a> ) <li>1/SIG*DSIG/DPT_L2 (<a href="159379?table=Table 56">Table 56</a> ) <li>DSIG/DPT_BB4L (<a href="159379?table=Table 59">Table 59</a> ) <li>1/SIG*DSIG/DPT_BB4L (<a href="159379?table=Table 62">Table 62</a> ) <li>DSIG/DPT_BBLL (<a href="159379?table=Table 65">Table 65</a> ) <li>1/SIG*DSIG/DPT_BBLL (<a href="159379?table=Table 68">Table 68</a> ) <li>SIG (<a href="159379?table=Table 71">Table 71</a> ) </ul><br/> MC statistical covariances: <ul> <li>DSIG/Dn_JETS (<a href="159379?table=Table 12">Table 12</a> ) <li>1/SIG*DSIG/Dn_JETS (<a href="159379?table=Table 15">Table 15</a> ) <li>DSIG/DM_BBLL (<a href="159379?table=Table 18">Table 18</a> ) <li>1/SIG*DSIG/DM_BBLL (<a href="159379?table=Table 21">Table 21</a> ) <li>DSIG/DMT_BB4L (<a href="159379?table=Table 24">Table 24</a> ) <li>1/SIG*DSIG/DMT_BB4L (<a href="159379?table=Table 27">Table 27</a> ) <li>DSIG/DPT_BB (<a href="159379?table=Table 30">Table 30</a> ) <li>1/SIG*DSIG/DPT_BB (<a href="159379?table=Table 33">Table 33</a> ) <li>DSIG/DPT_J1 (<a href="159379?table=Table 36">Table 36</a> ) <li>1/SIG*DSIG/DPT_J1 (<a href="159379?table=Table 39">Table 39</a> ) <li>DSIG/DPT_J2 (<a href="159379?table=Table 42">Table 42</a> ) <li>1/SIG*DSIG/DPT_J2 (<a href="159379?table=Table 45">Table 45</a> ) <li>DSIG/DPT_L1 (<a href="159379?table=Table 48">Table 48</a> ) <li>1/SIG*DSIG/DPT_L1 (<a href="159379?table=Table 51">Table 51</a> ) <li>DSIG/DPT_L2 (<a href="159379?table=Table 54">Table 54</a> ) <li>1/SIG*DSIG/DPT_L2 (<a href="159379?table=Table 57">Table 57</a> ) <li>DSIG/DPT_BB4L (<a href="159379?table=Table 60">Table 60</a> ) <li>1/SIG*DSIG/DPT_BB4L (<a href="159379?table=Table 63">Table 63</a> ) <li>DSIG/DPT_BBLL (<a href="159379?table=Table 66">Table 66</a> ) <li>1/SIG*DSIG/DPT_BBLL (<a href="159379?table=Table 69">Table 69</a> ) <li>SIG (<a href="159379?table=Table 72">Table 72</a> ) </ul><br/> Inter-spectra data statistical covariances: <ul> <li>SIG (exclusive) versus DSIG/DM_BL_MINIMAX (exclusive) (<a href="159379?table=Table 73">Table 73</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 74">Table 74</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 75">Table 75</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 76">Table 76</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 77">Table 77</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 78">Table 78</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 79">Table 79</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DPT_L1 (inclusive) (<a href="159379?table=Table 80">Table 80</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DPT_L2 (inclusive) (<a href="159379?table=Table 81">Table 81</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 82">Table 82</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 83">Table 83</a> ) <li>DSIG/DM_BL_MINIMAX (exclusive) versus SIG (inclusive) (<a href="159379?table=Table 84">Table 84</a> ) <li>SIG (exclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 85">Table 85</a> ) <li>SIG (exclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 86">Table 86</a> ) <li>SIG (exclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 87">Table 87</a> ) <li>SIG (exclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 88">Table 88</a> ) <li>SIG (exclusive) versus DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 89">Table 89</a> ) <li>SIG (exclusive) versus DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 90">Table 90</a> ) <li>SIG (exclusive) versus DSIG/DPT_L1 (inclusive) (<a href="159379?table=Table 91">Table 91</a> ) <li>SIG (exclusive) versus DSIG/DPT_L2 (inclusive) (<a href="159379?table=Table 92">Table 92</a> ) <li>SIG (exclusive) versus DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 93">Table 93</a> ) <li>SIG (exclusive) versus DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 94">Table 94</a> ) <li>SIG (exclusive) versus SIG (inclusive) (<a href="159379?table=Table 95">Table 95</a> ) <li>DSIG/DM_BBLL (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 96">Table 96</a> ) <li>DSIG/DM_BBLL (inclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 97">Table 97</a> ) <li>DSIG/DM_BBLL (inclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 98">Table 98</a> ) <li>DSIG/DPT_J1 (inclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 99">Table 99</a> ) <li>DSIG/DPT_J2 (inclusive) versus DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 100">Table 100</a> ) <li>DSIG/DPT_L1 (inclusive) versus DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 101">Table 101</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DPT_L1 (inclusive) (<a href="159379?table=Table 102">Table 102</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 103">Table 103</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 104">Table 104</a> ) <li>SIG (inclusive) versus DSIG/DPT_L2 (inclusive) (<a href="159379?table=Table 105">Table 105</a> ) <li>DSIG/DMT_BB4L (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 106">Table 106</a> ) <li>DSIG/DPT_BB (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 107">Table 107</a> ) <li>DSIG/DPT_J1 (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 108">Table 108</a> ) <li>DSIG/DPT_J1 (inclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 109">Table 109</a> ) <li>DSIG/DPT_J1 (inclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 110">Table 110</a> ) <li>DSIG/DPT_J2 (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 111">Table 111</a> ) <li>DSIG/DPT_J2 (inclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 112">Table 112</a> ) <li>DSIG/DPT_J2 (inclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 113">Table 113</a> ) <li>DSIG/DPT_J2 (inclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 114">Table 114</a> ) <li>DSIG/DPT_L1 (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 115">Table 115</a> ) <li>DSIG/DPT_L1 (inclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 116">Table 116</a> ) <li>DSIG/DPT_L1 (inclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 117">Table 117</a> ) <li>DSIG/DPT_L1 (inclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 118">Table 118</a> ) <li>DSIG/DPT_L1 (inclusive) versus DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 119">Table 119</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 120">Table 120</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 121">Table 121</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 122">Table 122</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 123">Table 123</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 124">Table 124</a> ) <li>DSIG/DPT_L2 (inclusive) versus DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 125">Table 125</a> ) <li>DSIG/Dn_JETS (inclusive) versus DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 126">Table 126</a> ) <li>DSIG/DPT_BBLL (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 127">Table 127</a> ) <li>DSIG/DPT_BBLL (inclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 128">Table 128</a> ) <li>DSIG/DPT_BBLL (inclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 129">Table 129</a> ) <li>DSIG/DPT_BBLL (inclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 130">Table 130</a> ) <li>DSIG/DPT_J1 (inclusive) versus DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 131">Table 131</a> ) <li>SIG (inclusive) versus DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 132">Table 132</a> ) <li>SIG (inclusive) versus DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 133">Table 133</a> ) <li>SIG (inclusive) versus DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 134">Table 134</a> ) <li>SIG (inclusive) versus DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 135">Table 135</a> ) <li>SIG (inclusive) versus DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 136">Table 136</a> ) <li>SIG (inclusive) versus DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 137">Table 137</a> ) <li>SIG (inclusive) versus DSIG/DPT_L1 (inclusive) (<a href="159379?table=Table 138">Table 138</a> ) <li>SIG (inclusive) versus DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 139">Table 139</a> ) <li>SIG (inclusive) versus DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 140">Table 140</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 141">Table 141</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 142">Table 142</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 143">Table 143</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 144">Table 144</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 145">Table 145</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 146">Table 146</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DPT_L1 (inclusive) (<a href="159379?table=Table 147">Table 147</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DPT_L2 (inclusive) (<a href="159379?table=Table 148">Table 148</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 149">Table 149</a> ) <li>1/SIG*DSIG/DM_BL_MINIMAX (exclusive) versus 1/SIG*DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 150">Table 150</a> ) <li>1/SIG*DSIG/DM_BBLL (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 151">Table 151</a> ) <li>1/SIG*DSIG/DM_BBLL (inclusive) versus 1/SIG*DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 152">Table 152</a> ) <li>1/SIG*DSIG/DM_BBLL (inclusive) versus 1/SIG*DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 153">Table 153</a> ) <li>1/SIG*DSIG/DPT_J1 (inclusive) versus 1/SIG*DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 154">Table 154</a> ) <li>1/SIG*DSIG/DPT_J2 (inclusive) versus 1/SIG*DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 155">Table 155</a> ) <li>1/SIG*DSIG/DPT_L1 (inclusive) versus 1/SIG*DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 156">Table 156</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DPT_L1 (inclusive) (<a href="159379?table=Table 157">Table 157</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 158">Table 158</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 159">Table 159</a> ) <li>1/SIG*DSIG/DMT_BB4L (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 160">Table 160</a> ) <li>1/SIG*DSIG/DPT_BB (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 161">Table 161</a> ) <li>1/SIG*DSIG/DPT_J1 (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 162">Table 162</a> ) <li>1/SIG*DSIG/DPT_J1 (inclusive) versus 1/SIG*DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 163">Table 163</a> ) <li>1/SIG*DSIG/DPT_J1 (inclusive) versus 1/SIG*DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 164">Table 164</a> ) <li>1/SIG*DSIG/DPT_J2 (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 165">Table 165</a> ) <li>1/SIG*DSIG/DPT_J2 (inclusive) versus 1/SIG*DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 166">Table 166</a> ) <li>1/SIG*DSIG/DPT_J2 (inclusive) versus 1/SIG*DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 167">Table 167</a> ) <li>1/SIG*DSIG/DPT_J2 (inclusive) versus 1/SIG*DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 168">Table 168</a> ) <li>1/SIG*DSIG/DPT_L1 (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 169">Table 169</a> ) <li>1/SIG*DSIG/DPT_L1 (inclusive) versus 1/SIG*DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 170">Table 170</a> ) <li>1/SIG*DSIG/DPT_L1 (inclusive) versus 1/SIG*DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 171">Table 171</a> ) <li>1/SIG*DSIG/DPT_L1 (inclusive) versus 1/SIG*DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 172">Table 172</a> ) <li>1/SIG*DSIG/DPT_L1 (inclusive) versus 1/SIG*DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 173">Table 173</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 174">Table 174</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 175">Table 175</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 176">Table 176</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 177">Table 177</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DPT_J1 (inclusive) (<a href="159379?table=Table 178">Table 178</a> ) <li>1/SIG*DSIG/DPT_L2 (inclusive) versus 1/SIG*DSIG/DPT_J2 (inclusive) (<a href="159379?table=Table 179">Table 179</a> ) <li>1/SIG*DSIG/Dn_JETS (inclusive) versus 1/SIG*DSIG/DPT_BB4L (inclusive) (<a href="159379?table=Table 180">Table 180</a> ) <li>1/SIG*DSIG/DPT_BBLL (inclusive) versus 1/SIG*DSIG/Dn_JETS (inclusive) (<a href="159379?table=Table 181">Table 181</a> ) <li>1/SIG*DSIG/DPT_BBLL (inclusive) versus 1/SIG*DSIG/DM_BBLL (inclusive) (<a href="159379?table=Table 182">Table 182</a> ) <li>1/SIG*DSIG/DPT_BBLL (inclusive) versus 1/SIG*DSIG/DMT_BB4L (inclusive) (<a href="159379?table=Table 183">Table 183</a> ) <li>1/SIG*DSIG/DPT_BBLL (inclusive) versus 1/SIG*DSIG/DPT_BB (inclusive) (<a href="159379?table=Table 184">Table 184</a> ) <li>1/SIG*DSIG/DPT_J1 (inclusive) versus 1/SIG*DSIG/DPT_BBLL (inclusive) (<a href="159379?table=Table 185">Table 185</a> ) </ul>
Absolute differential cross-section as a function of $m^{bl}_{minimax}$ at particle level in the exclusive topology. Note that the values shown here are obtained by propagating the individual uncertainties to the measured cross-sections. The covariance matrices are evaluated using pseudo-experiments for data and MC statistical uncertainties, and added to the individual covariance matrices for the remaining uncertainties, as described in the text. The measured differential cross-section is compared with the prediction obtained with the Powheg+Pythia8 Monte Carlo generator.
Covariance matrix of the absolute differential cross-section as function of $m^{bl}_{minimax}$ at particle level in the exclusive topology, accounting for the data statistical uncertainties.
Several new physics models including versions of supersymmetry (SUSY) characterized by $R$-parity violation (RPV) or with additional hidden sectors predict the production of events with top quarks, low missing transverse momentum, and many additional quarks or gluons. The results of a search for top squarks decaying to two top quarks and six additional light-flavor quarks or gluons are reported. The search employs a novel machine learning method for background estimation from control samples in data using decorrelated discriminators. The search is performed using events with 0, 1, or 2 electrons or muons in conjunction with at least six jets. No requirement is placed on the magnitude of the missing transverse momentum. The result is based on a sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV corresponding to 138 fb$^{-1}$ of integrated luminosity collected with the CMS detector at the LHC in 2016$-$2018. The data are used to determine upper limits on the top squark pair production cross section in the frameworks of RPV and stealth SUSY. Models with top squark masses less than 700 (930) GeV are excluded at 95% confidence level for RPV (stealth) SUSY scenarios.
Cutflows and signal efficiencies for the RPV SUSY model in the $0\ell$ channel corresponding to two values of $m_{\tilde{t}}$.
Cutflows and signal efficiencies for the Stealth SYY SUSY model in the $0\ell$ channel corresponding to two values of $m_{\tilde{t}}$.
Cutflows and signal efficiencies for the RPV SUSY model in the $1\ell$ channel corresponding to two values of $m_{\tilde{t}}$.
Measurements of $W^+W^-\rightarrow e^\pm νμ^\mp ν$ production cross-sections are presented, providing a test of the predictions of perturbative quantum chromodynamics and the electroweak theory. The measurements are based on data from $pp$ collisions at $\sqrt{s}=13$ TeV recorded by the ATLAS detector at the Large Hadron Collider in 2015-2018, corresponding to an integrated luminosity of 140 fb$^{-1}$. The number of events due to top-quark pair production, the largest background, is reduced by rejecting events containing jets with $b$-hadron decays. An improved methodology for estimating the remaining top-quark background enables a precise measurement of $W^+W^-$ cross-sections with no additional requirements on jets. The fiducial $W^+W^-$ cross-section is determined in a maximum-likelihood fit with an uncertainty of 3.1%. The measurement is extrapolated to the full phase space, resulting in a total $W^+W^-$ cross-section of $127\pm4$ pb. Differential cross-sections are measured as a function of twelve observables that comprehensively describe the kinematics of $W^+W^-$ events. The measurements are compared with state-of-the-art theory calculations and excellent agreement with predictions is observed. A charge asymmetry in the lepton rapidity is observed as a function of the dilepton invariant mass, in agreement with the Standard Model expectation. A CP-odd observable is measured to be consistent with no CP violation. Limits on Standard Model effective field theory Wilson coefficients in the Warsaw basis are obtained from the differential cross-sections.
Measured fiducial cross-section compared with theoretical predictions from MiNNLO+Pythia8, Geneva+Pythia8, Sherpa2.2.12, and MATRIX2.1. The predictions are based on the NNPDF3.0 (red squares) and NNPDF3.1 luxQED (blue dots) PDF sets. The nNNLO predictions include photon-induced contributions (always using NNPDF3.1 luxQED) and NLO QCD corrections to the gluon-gluon initial state. The $q\bar{q}\rightarrow WW$ predictions from MiNNLO, Geneva, and Sherpa2.2.12 are combined with a Sherpa2.2.2 prediction of gluon-induced production, scaled by an inclusive NLO K-factor of 1.7. Inner (outer) error bars on the theory predictions correspond to PDF (the combination of scale and PDF) uncertainties. The MATRIX nNNLO QCD $\otimes$ NLO EW prediction using NNPDF3.1 luxQED, the best available prediction of the integrated fiducial cross-section, is in good agreement with the measurement.
Fiducial differential cross-sections as a function of $p_{\mathrm{T}}^{\mathrm{lead.\,lep.}}$. The measured cross-section values are shown as points with error bars giving the statistical uncertainty and solid bands indicating the size of the total uncertainty. The right-hand-side axis indicates the integrated cross-section of the rightmost bin. The results are compared to fixed-order nNNLO QCD + NLO EW predictions of Matrix 2.1, with the NNLO + PS predictions from Powheg MiNNLO + Pythia8 and Geneva + Pythia8, as well as Sherpa2.2.12 NLO + PS predictions. The last three predictions are combined with Sherpa 2.2.2 for the $gg$ initial state and Sherpa 2.2.12 for electroweak $WWjj$ production. These contributions are modelled at LO but a NLO QCD $k$-factor of 1.7 is applied for gluon induced production. Theoretical predictions are indicated as markers with vertical lines denoting PDF, scale and parton shower uncertainties. Markers are staggered for better visibility.
Correlation matrix of the statistical uncertainties in the measured fiducial cross section for the observable $p_{\mathrm{T}}^{\mathrm{lead.\,lep.}}$.
The total cross section for Compton scattering off atomic electrons, $γ+e\rightarrowγ'+e'$, was measured using photons with energies between 6.5 and 11.1 GeV incident on a $^9$Be target as part of the PrimEx-eta experiment in Hall D at Jefferson Lab. This is the first measurement of this fundamental QED process within this energy range. The total uncertainties of the cross section, combining the statistical and systematic components in quadrature, averaged to 3.4% across all energy bins. This not only demonstrates the capability of this experimental setup to perform precision cross-section measurements at forward angles but also allows us to compare with state-of-the-art QED calculations.
$\gamma +e^- \rightarrow \gamma + e^-$ total cross section in bins of photon beam energy. The first uncertainties are statistical, and the second are systematic.
A search is performed for dark matter (DM) produced in association with a single top quark or a pair of top quarks using the data collected with the CMS detector at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to 138 fb$^{-1}$ of integrated luminosity. An excess of events with a large imbalance of transverse momentum is searched for across 0, 1 and 2 lepton final states. Novel multivariate techniques are used to take advantage of the differences in kinematic properties between the two DM production mechanisms. No significant deviations with respect to the standard model predictions are observed. The results are interpreted considering a simplified model in which the mediator is either a scalar or pseudoscalar particle and couples to top quarks and to DM fermions. Axion-like particles that are coupled to top quarks and DM fermions are also considered. Expected exclusion limits of 410 and 380 GeV for scalar and pseudoscalar mediator masses, respectively, are set at the 95% confidence level. A DM particle mass of 1 GeV is assumed, with mediator couplings to fermions and DM particles set to unity. A small signal-like excess is observed in data, with the largest local significance observed to be 1.9 standard deviations for the 150 GeV pseudoscalar mediator hypothesis. Because of this excess, mediator masses are only excluded below 310 (320) GeV for the scalar (pseudoscalar) mediator. The results are also translated into model-independent 95% confidence level upper limits on the visible cross section of DM production in association with top quarks, ranging from 1 pb to 0.02 pb.
The post-fit $p_{\mathrm{T}}^{\text{miss}}$ distribution of the 1 b jet, 0 forward jet signal region in the all hadronic channel. A representative signal model distribution is shown for the scalar mediator interaction with $(m_{\chi},m_{\phi})=(1,100)$GeV and couplings set to unity. The grey dashed area in the upper panel represents the total uncertainty in all of the backgrounds and the chosen signal model, while in the lower panel it represents only the total uncertainty in the backgrounds.
The post-fit $p_{\mathrm{T}}^{\text{miss}}$ distribution of the 1 b jet, $\geq 1$ forward jet signal region in the all hadronic channel. A representative signal model distribution is shown for the scalar mediator interaction with $(m_{\chi},m_{\phi})=(1,100)$GeV and couplings set to unity. The grey dashed area in the upper panel represents the total uncertainty in all of the backgrounds and the chosen signal model, while in the lower panel it represents only the total uncertainty in the backgrounds.
The post-fit $p_{\mathrm{T}}^{\text{miss}}$ distribution of the $\geq 2$ b jet signal region in the all hadronic channel. A representative signal model distribution is shown for the scalar mediator interaction with $(m_{\chi},m_{\phi})=(1,100)$GeV and couplings set to unity. The grey dashed area in the upper panel represents the total uncertainty in all of the backgrounds and the chosen signal model, while in the lower panel it represents only the total uncertainty in the backgrounds.
A search is presented for hadronic signatures of beyond the Standard Model (BSM) physics, with an emphasis on signatures of a strongly-coupled hidden dark sector accessed via resonant production of a $Z'$ mediator. The ATLAS experiment dataset collected at the Large Hadron Collider from 2015 to 2018 is used, consisting of proton-proton collisions at $\sqrt{s}$ = 13 TeV and corresponding to an integrated luminosity of 140 fb$^{-1}$. The $Z'$ mediator is considered to decay to two dark quarks, which each hadronize and decay to showers containing both dark and Standard Model particles, producing a topology of interacting and non-interacting particles within a jet known as ``semi-visible". Machine learning methods are used to select these dark showers and reject the dominant background of mismeasured multijet events, including an anomaly detection approach to preserve broad sensitivity to a variety of BSM topologies. A resonance search is performed by fitting the transverse mass spectrum based on a functional form background estimation. No significant excess over the expected background is observed. Results are presented as limits on the production cross section of semi-visible jet signals, parameterized by the fraction of invisible particles in the decay and the $Z'$ mass, and by quantifying the significance of any generic Gaussian-shaped mass peak in the anomaly region.
Acceptance times efficiency weighted yields across the signal grid.
The 95% CL limits on the cross-section $\sigma(pp \rightarrow Z' \rightarrow \chi \chi$) times branching ratio B in fb with all statistical and systematic uncertainties, for the $R_{\text{inv}}=$0.2 signal points.
The 95% CL limits on the cross-section $\sigma(pp \rightarrow Z' \rightarrow \chi \chi$) times branching ratio B in fb with all statistical and systematic uncertainties, for the $R_{\text{inv}}=$0.4 signal points.
A search for resonances in top quark pair ($\text{t}\bar{\text{t}}$) production in final states with two charged leptons and multiple jets is presented, based on proton-proton collision data collected by the CMS experiment at the CERN LHC at $\sqrt{s}$ = 13 TeV, corresponding to 138 fb$^{-1}$. The analysis explores the invariant mass of the $\text{t}\bar{\text{t}}$ system and two angular observables that provide direct access to the correlation of top quark and antiquark spins. A significant excess of events is observed near the kinematic $\text{t}\bar{\text{t}}$ threshold compared to the nonresonant production predicted by fixed-order perturbative quantum chromodynamics (pQCD). The observed enhancement is consistent with the production of a color-singlet pseudoscalar ($^1$S$^{[1]}_0$) quasi-bound toponium state, as predicted by nonrelativistic quantum chromodynamics. Using a simplified model for $^1$S$^{[1]}_0$ toponium, the cross section of the excess above the pQCD prediction is measured to be 8.8 $^{+1.2}_{-1.4}$ pb.
Observed cross section of $\eta_t$
Observed values of twice the negative log-likelihood with respect to the best-fit point (2dNLL) as a function of the cross sections of $\eta_t$ and $\chi_t$.
Measurements of the total and differential Higgs boson production cross-sections, via $WH$ and $ZH$ associated production using $H\rightarrow WW^\ast\rightarrow\ellν\ellν$ and $H\rightarrow WW^\ast\rightarrow\ellνjj$ decays, are presented. The analysis uses proton-proton events delivered by the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector between 2015 and 2018. The data correspond to an integrated luminosity of 140 fb$^{-1}$. The sum of the $WH$ and $ZH$ cross-sections times the $H\rightarrow WW^\ast$ branching fraction is measured to be $0.44^{+0.10}_{-0.09}$ (stat.) $^{+0.06}_{-0.05}$ (syst.) pb, in agreement with the Standard Model prediction. Higgs boson production is further characterised through measurements of the differential cross-section as a function of the transverse momentum of the vector boson and in the framework of Simplified Template Cross-Sections.
Post-fit distribution of $ANN_{Zdom}$ in the Z-dominated SR. The post-fit result is obtained from the combined 2-POI fit described in section 9.1 of the paper.
Best-fit values of the total $WH$, $ZH$, and $VH$ cross sections times the $H\rightarrow WW^{*}$ branching ratio.
Observed profile likelihood as a function of $\sigma\times\mathcal{B}_{H\rightarrow WW^{*}}$ normalised by the SM expectation for the $VH$ and $WH/ZH$ measurements from the combined 1- and 2-POI fits, respectively
The production cross-section of high-mass $τ$-lepton pairs is measured as a function of the dilepton visible invariant mass, using 140 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collision data recorded with the ATLAS detector at the Large Hadron Collider. The measurement agrees with the predictions of the Standard Model. A fit to the invariant mass distribution is performed as a function of $b$-jet multiplicity, to constrain the non-resonant production of new particles described by an effective field theory or in models containing leptoquarks or $Z'$ bosons that couple preferentially to third-generation fermions. The constraints on new particles improve on previous results, and the constraints on effective operators include those affecting the anomalous magnetic moment of the $τ$-lepton.
The measured unfolded differential cross sections.
The measured unfolded differential cross sections.
The combined covariance matrix for the differential cross-section distribution.
A search for cascade decays of charged sleptons and sneutrinos using final states characterized by three leptons (electrons or muons) and missing transverse momentum is presented. The analysis is based on a dataset with 140 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of $\sqrt{s}$=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. This paper focuses on a supersymmetric scenario that is motivated by the muon anomalous magnetic moment observation, dark mattter relic density abundance, and electroweak naturalness. A mass spectrum involving light higgsinos and heavier sleptons with a bino at intermediate mass is targeted. No significant deviation from the Standard Model expectation is observed. This search enables to place stringent constraints on this model, excluding at the 95% confidence level charged slepton and sneutrino masses up to 450 GeV when assuming a lightest neutralino mass of 100 GeV and mass-degenerate selectrons, smuons and sneutrinos.
Distribution of $m_{3\ell}$ in SROS-on-$eee$. The SR selections are applied for each distribution, except for the variable shown, for which the selection is indicated by a black arrow. The last bin includes the overflow. The `Others' category contains the production of Higgs boson, 3-top, 4-top, and single-top processes. Distributions for SBH signals are overlaid. The bottom panels show the ratio of the observed data to the predicted total background yields. The hatched band includes all statistical and systematic uncertainties.
Distribution of $m_{3\ell}$ in SROS-on-$e\mu\mu$. The SR selections are applied for each distribution, except for the variable shown, for which the selection is indicated by a black arrow. The last bin includes the overflow. The `Others' category contains the production of Higgs boson, 3-top, 4-top, and single-top processes. Distributions for SBH signals are overlaid. The bottom panels show the ratio of the observed data to the predicted total background yields. The hatched band includes all statistical and systematic uncertainties.
Distribution of $E_{\text{T}}^{\text{miss}}$ in SROS-on-b-$eee$. The SR selections are applied for each distribution, except for the variable shown, for which the selection is indicated by a black arrow. The last bin includes the overflow. The `Others' category contains the production of Higgs boson, 3-top, 4-top, and single-top processes. Distributions for SBH signals are overlaid. The bottom panels show the ratio of the observed data to the predicted total background yields. The hatched band includes all statistical and systematic uncertainties.