Search for a CP-odd Higgs boson decaying into a heavy CP-even Higgs boson and a $Z$ boson in the $\ell^+\ell^- t\bar{t}$ and $\nu\bar{\nu}b\bar{b}$ final states using 140 fb$^{-1}$ of data collected with the ATLAS detector

The ATLAS collaboration
JHEP 02 (2024) 197, 2024.

Abstract (data abstract)
A search for a heavy CP-odd Higgs boson, $A$, decaying into a $Z$ boson and a heavy CP-even Higgs boson, $H$, is presented using the full LHC Run 2 dataset of $pp$ collisions at $\sqrt{s}=13$ TeV collected with the ATLAS detector, corresponding to an integrated luminosity of $140$ fb$^{-1}$. The search for $A\to ZH$ is performed in the $\ell^+\ell^- t\bar{t}$ and $\nu\bar{\nu}b\bar{b}$ final states and extends the reach of previous searches into different final states in the region with $m_H>350$ GeV and $m_A>800$ GeV. No significant deviation from the Standard Model expectation is found. Upper limits on the production cross-section times the decay branching ratios are set. Limits with a reduced model dependence are also presented as functions of the reconstructed $m(t\bar{t})$ and $m(b\bar{b})$ distributions in the $\ell^+\ell^- t\bar{t}$ and $\nu\bar{\nu}b\bar{b}$ channel, respectively. In addition, an interpretation of the results in the context of two-Higgs-doublet models is given.

  • Overview

    10.17182/hepdata.144335.v1/t1

    Overview of HEPData Record Upper limits on cross-sections: 95% CL upper limit on ggF A->ZH(tt) production for tanb=0.5...

  • m(lltt)-m(tt),L3hi_Zin_Hin450,ggF-production

    Data from Figure 3(a)

    10.17182/hepdata.144335.v1/t2

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=450 GeV hypothesis....

  • mTVH,2tag,0L_Hin300,ggF-production

    Data from Figure 3(b)

    10.17182/hepdata.144335.v1/t3

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=300...

  • mTVH,3ptag,0L_Hin300,bbA-production

    Data from Figure 3(c)

    10.17182/hepdata.144335.v1/t4

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=300...

  • m(tt),L3hi_Zin,ggF-production

    Data from Figure 4(a)

    10.17182/hepdata.144335.v1/t5

    The m(tt) distribution in the Lhi3_Zin region of the lltt channel. return to overview

  • m(bb),2tag,0L,ggF-production

    Data from Figure 4(b)

    10.17182/hepdata.144335.v1/t6

    The m(bb) distribution in the 2 b-tag 0L region of the vvbb channel. return to overview

  • m(bb),3ptag,0L,bbA-production

    Data from Figure 4(c)

    10.17182/hepdata.144335.v1/t7

    The m(bb) distribution in the 3+ b-tag 0L region of the vvbb channel. return to overview

  • Cross-section limits for lltt, ggF, tanbeta=1

    Data from Figures 5(a-b)

    10.17182/hepdata.144335.v1/t8

    Expected and observed upper limits at 95% CL on sigma(gg->A)*B(A->ZH)*B(H->tt) in the (mA,mH) plane. The limits are shown for tanbeta=1....

  • Cross-section limits for lltt, bbA, tanbeta=10

    Data from Figures 5(c-d)

    10.17182/hepdata.144335.v1/t9

    Expected and observed upper limits at 95% CL on sigma(bbA)*B(A->ZH)*B(H->tt)$ in the (mA,mH) plane. The limits are shown for tanbeta=10....

  • Cross-section limits for vvbb, ggF, tanbeta=1

    Data from Figures 6(a-b)

    10.17182/hepdata.144335.v1/t10

    Expected and observed upper limits at 95% CL on sigma(gg->A)*B(A->ZH)*B(H->bb) in the (mA,mH) plane. The limits are shown for tanbeta=1....

  • Cross-section limits for vvbb, bbA, tanbeta=10

    Data from Figures 6(c-d)

    10.17182/hepdata.144335.v1/t11

    Expected and observed upper limits at 95% CL on sigma(bbA)*B(A->ZH)*B(H->bb) in the (mA,mH) plane. The limits are shown for tanbeta=10....

  • Cross-section limits for lltt, ggF, tanbeta=0.5

    Data from Figures 9(a-b) from the Appendix

    10.17182/hepdata.144335.v1/t12

    Expected and observed upper limits at 95% CL on sigma(gg->A)*B(A->ZH)*B(H->tt) in he (mA,mH) plane. The limits are shown for tanbeta=0.5....

  • Cross-section limits for lltt, ggF, tanbeta=5

    Data from Figures 9(c-d) from the Appendix

    10.17182/hepdata.144335.v1/t13

    Expected and observed upper limits at 95% CL on sigma(gg->A)*B(A->ZH)*B(H->tt) in the (mA,mH) plane. The limits are shown for tanbeta=5....

  • Cross-section limits for lltt, bbA, tanbeta=1

    Data from Figures 10(a-b) from the Appendix

    10.17182/hepdata.144335.v1/t14

    Expected and observed upper limits at 95% CL on sigma(bbA)*B(A->ZH)*B(H->tt) in the (mA,mH) plane. The limits are shown for tanbeta=1....

  • Cross-section limits for lltt, bbA, tanbeta=5

    Data from Figures 10(c-d)

    10.17182/hepdata.144335.v1/t15

    Expected and observed upper limits at 95% CL on sigma(bbA)*B(A->ZH)*B(H->tt)$ in the (mA,mH) plane. The limits are shown for tanbeta=5....

  • Cross-section limits for vvbb, ggF, tanbeta=0.5

    Data from Figures 11(a-b) from the Appendix

    10.17182/hepdata.144335.v1/t16

    Expected and observed upper limits at 95% CL on sigma(gg->A)*B(A->ZH)*B(H->bb) in the (mA,mH) plane. The limits are shown for tanbeta=0.5....

  • Cross-section limits for vvbb, ggF, tanbeta=5

    Data from Figures 11(c-d) from the Appendix

    10.17182/hepdata.144335.v1/t17

    Expected and observed upper limits at 95% CL on sigma(gg->A)*B(A->ZH)*B(H->bb) in the (mA,mH) plane. The limits are shown for tanbeta=5....

  • Cross-section limits for vvbb, bbA, tanbeta=1

    Data from Figures 12(a-b) from the Appendix

    10.17182/hepdata.144335.v1/t18

    Expected and observed upper limits at 95% CL on sigma(bbA)*B(A->ZH)*B(H->bb) in the (mA,mH) plane. The limits are shown for tanbeta=1....

  • Cross-section limits for vvbb, bbA, tanbeta=5

    Data from Figures 12(c-d) from the Appendix

    10.17182/hepdata.144335.v1/t19

    Expected and observed upper limits at 95% CL on sigma(bbA)*B(A->ZH)*B(H->bb) in the (mA,mH) plane. The limits are shown for tanbeta=5....

  • Cross-section limits for vvbb, bbA, tanbeta=20

    Data from Figures 12(e-f) from the Appendix

    10.17182/hepdata.144335.v1/t20

    Expected and observed upper limits at 95% CL on sigma(bbA)*B(A->ZH)*B(H->bb) in the (mA,mH) plane. The limits are shown for tanbeta=20....

  • m(lltt)-m(tt),L3hi_Zin_Hin450,bbA-production

    Data from Auxiliary Figure 1(a)

    10.17182/hepdata.144335.v1/t21

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=450 GeV hypothesis...

  • m(tt),L3hi_Zin,bbA-production

    Data from Auxiliary Figure 1(b)

    10.17182/hepdata.144335.v1/t22

    The m(tt) distribution in the L3hi_Zin region of the lltt channel for the mH=450 GeV hypothesis with the bbA signal...

  • m(lltt)-m(tt),L3hi_Zin_Hin350,ggF-production

    Data from Auxiliary Figure 2(a)

    10.17182/hepdata.144335.v1/t23

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=350 GeV hypothesis....

  • m(lltt)-m(tt),L3hi_Zin_Hin400,ggF-production

    Data from Auxiliary Figure 2(b)

    10.17182/hepdata.144335.v1/t24

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=400 GeV hypothesis....

  • m(lltt)-m(tt),L3hi_Zin_Hin500,ggF-production

    Data from Auxiliary Figure 2(d)

    10.17182/hepdata.144335.v1/t25

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=500 GeV hypothesis....

  • m(lltt)-m(tt),L3hi_Zin_Hin550,ggF-production

    Data from Auxiliary Figure 2(e)

    10.17182/hepdata.144335.v1/t26

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=550 GeV hypothesis....

  • m(lltt)-m(tt),L3hi_Zin_Hin600,ggF-production

    Data from Auxiliary Figure 2(f)

    10.17182/hepdata.144335.v1/t27

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=600 GeV hypothesis....

  • m(lltt)-m(tt),L3hi_Zin_Hin700,ggF-production

    Data from Auxiliary Figure 2(g)

    10.17182/hepdata.144335.v1/t28

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=700 GeV hypothesis....

  • m(lltt)-m(tt),L3hi_Zin_Hin800,ggF-production

    Data from Auxiliary Figure 2(h)

    10.17182/hepdata.144335.v1/t29

    The distribution of the fit discriminant m(lltt)-m(tt) in the signal region of the lltt channel for the mH=800 GeV hypothesis....

  • mTVH,2tag,0L_Hin130,ggF-production

    Data from Auxiliary Figure 3(a)

    10.17182/hepdata.144335.v1/t30

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=130...

  • mTVH,2tag,0L_Hin150,ggF-production

    Data from Auxiliary Figure 3(b)

    10.17182/hepdata.144335.v1/t31

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=150...

  • mTVH,2tag,0L_Hin200,ggF-production

    Data from Auxiliary Figure 3(c)

    10.17182/hepdata.144335.v1/t32

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=200...

  • mTVH,2tag,0L_Hin250,ggF-production

    Data from Auxiliary Figure 3(d)

    10.17182/hepdata.144335.v1/t33

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=250...

  • mTVH,2tag,0L_Hin350,ggF-production

    Data from Auxiliary Figure 3(f)

    10.17182/hepdata.144335.v1/t34

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=350...

  • mTVH,2tag,0L_Hin400,ggF-production

    Data from Auxiliary Figure 3(g)

    10.17182/hepdata.144335.v1/t35

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=400...

  • mTVH,2tag,0L_Hin450,ggF-production

    Data from Auxiliary Figure 3(h)

    10.17182/hepdata.144335.v1/t36

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=450...

  • mTVH,2tag,0L_Hin500,ggF-production

    Data from Auxiliary Figure 3(i)

    10.17182/hepdata.144335.v1/t37

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=500...

  • mTVH,2tag,0L_Hin600,ggF-production

    Data from Auxiliary Figure 3(j)

    10.17182/hepdata.144335.v1/t38

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=600...

  • mTVH,2tag,0L_Hin700,ggF-production

    Data from Auxiliary Figure 3(k)

    10.17182/hepdata.144335.v1/t39

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=700...

  • mTVH,2tag,0L_Hin800,ggF-production

    Data from Auxiliary Figure 3(l)

    10.17182/hepdata.144335.v1/t40

    The distribution of the fit discriminant mTVH in the 2 b-tag signal region of the vvbb channel for the mH=800...

  • mTVH,3ptag,0L_Hin130,bbA-production

    Data from Auxiliary Figure 4(a)

    10.17182/hepdata.144335.v1/t41

    The distribution of the fit discriminant mTVH i+ the 3p b-tag signal region of the vvbb channel for the mH=130...

  • mTVH,3ptag,0L_Hin150,bbA-production

    Data from Auxiliary Figure 4(b)

    10.17182/hepdata.144335.v1/t42

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=150...

  • mTVH,3ptag,0L_Hin200,bbA-production

    Data from Auxiliary Figure 4(c)

    10.17182/hepdata.144335.v1/t43

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=200...

  • mTVH,3ptag,0L_Hin250,bbA-production

    Data from Auxiliary Figure 4(d)

    10.17182/hepdata.144335.v1/t44

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=250...

  • mTVH,3ptag,0L_Hin350,bbA-production

    Data from Auxiliary Figure 4(f)

    10.17182/hepdata.144335.v1/t45

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=350...

  • mTVH,3ptag,0L_Hin400,bbA-production

    Data from Auxiliary Figure 4(g)

    10.17182/hepdata.144335.v1/t46

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=400...

  • mTVH,3ptag,0L_Hin450,bbA-production

    Data from Auxiliary Figure 4(h)

    10.17182/hepdata.144335.v1/t47

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=450...

  • mTVH,3ptag,0L_Hin500,bbA-production

    Data from Auxiliary Figure 4(i)

    10.17182/hepdata.144335.v1/t48

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=500...

  • mTVH,3ptag,0L_Hin600,bbA-production

    Data from Auxiliary Figure 4(j)

    10.17182/hepdata.144335.v1/t49

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=600...

  • mTVH,3ptag,0L_Hin700,bbA-production

    Data from Auxiliary Figure 4(k)

    10.17182/hepdata.144335.v1/t50

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=700...

  • mTVH,3ptag,0L_Hin800,bbA-production

    Data from Auxiliary Figure 4(l)

    10.17182/hepdata.144335.v1/t51

    The distribution of the fit discriminant mTVH in the 3+ b-tag signal region of the vvbb channel for the mH=800...

  • mTVH,2tag,2L

    Data from Auxiliary Figure 5(a)

    10.17182/hepdata.144335.v1/t52

    The distribution of the fit discriminant mTVH in the 2 b-tag 2L region of the vvbb channel. return to...

  • mTVH,2tag,em

    Data from Auxiliary Figure 5(b)

    10.17182/hepdata.144335.v1/t53

    The distribution of the fit discriminant mTVH in the 2 b-tag em region of the vvbb channel. return to...

  • mTVH,3ptag,2L

    Data from Auxiliary Figure 5(c)

    10.17182/hepdata.144335.v1/t54

    The distribution of the fit discriminant mTVH in the 3+ b-tag 2L region of the vvbb channel. return to...

  • mTVH,3ptag,em

    Data from Auxiliary Figure 5(d)

    10.17182/hepdata.144335.v1/t55

    The distribution of the fit discriminant mTVH in the 3+ b-tag em region of the vvbb channel. return to...

  • Local significance, lltt, ggF production

    Data from Auxiliary Figure 6(a)

    10.17182/hepdata.144335.v1/t56

    Local significance for lltt ggF signals for tanbeta=1. return to overview

  • Local significance, lltt, bbA production

    Data from Auxiliary Figure 6(b)

    10.17182/hepdata.144335.v1/t57

    Local significance for lltt bbA signals for tanbeta=20. return to overview

  • Local significance, vvbb, ggF production

    Data from Auxiliary Figure 6(c)

    10.17182/hepdata.144335.v1/t58

    Local significance for vvbb ggF signals for tanbeta=1. return to overview

  • Local significance, vvbb, bbA production

    Data from Auxiliary Figure 6(d)

    10.17182/hepdata.144335.v1/t59

    Local significance for vvbb bbA signals for tanbeta=20. return to overview

  • Acceptance*efficiency, lltt, ggF production

    Data from Auxiliary Figure 8(a)

    10.17182/hepdata.144335.v1/t60

    Signal acceptance times efficiency for lltt ggF signals. return to overview

  • Acceptance*efficiency, lltt, bbA production

    Data from Auxiliary Figure 8(b)

    10.17182/hepdata.144335.v1/t61

    Signal acceptance times efficiency for lltt bbA signals. return to overview

  • Acceptance*efficiency, vvbb, ggF production

    Data from Auxiliary Figure 8(c)

    10.17182/hepdata.144335.v1/t62

    Signal acceptance times efficiency for vvbb ggF signals. return to overview

  • Acceptance*efficiency, vvbb, bbA production

    Data from Auxiliary Figure 8(d)

    10.17182/hepdata.144335.v1/t63

    Signal acceptance times efficiency for vvbb bbA signals. return to overview

  • lep3pt,L3hi_Zin

    Data from Auxiliary Figure 10(a)

    10.17182/hepdata.144335.v1/t64

    The pT distribution of the third lepton in the L3hi_Zin region of the lltt channel. return to overview

  • etaHrestVH,L3hi_Zin

    Data from Auxiliary Figure 10(b)

    10.17182/hepdata.144335.v1/t65

    The eta distribution of the H boson candidate in the rest frame of the A boson candidate in the L3hi_Zin...

  • ETmiss,2tag,0L

    Data from Auxiliary Figure 10(c)

    10.17182/hepdata.144335.v1/t66

    The ETmiss distribution in the 2 b-tag 0L region of the vvbb channel. return to overview

  • mtopnear,2tag,0L

    Data from Auxiliary Figure 10(d)

    10.17182/hepdata.144335.v1/t67

    The m_top_near distribution in the 2 b-tag 0L region of the vvbb channel. return to overview

  • ETmiss,3ptag,0L

    Data from Auxiliary Figure 10(e)

    10.17182/hepdata.144335.v1/t68

    The ETmiss distribution in the 3+ b-tag 0L region of the vvbb channel. return to overview

  • mtopnear,3ptag,0L

    Data from Auxiliary Figure 10(f)

    10.17182/hepdata.144335.v1/t69

    The m_top_near distribution in the 3+ b-tag 0L region of the vvbb channel. return to overview

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