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Evidence for the charge asymmetry in $pp \rightarrow t\bar{t}$ production at $\sqrt{s}= 13$ TeV with the ATLAS detector

The ATLAS collaboration Aad, G. ; Abbott, B. ; Abbott, D.C. ; et al.
JHEP 08 (2023) 077, 2023.
Inspire Record 2141752 DOI 10.17182/hepdata.132116

Inclusive and differential measurements of the top-antitop ($t\bar{t}$) charge asymmetry $A_\text{C}^{t\bar{t}}$ and the leptonic asymmetry $A_\text{C}^{\ell\bar{\ell}}$ are presented in proton-proton collisions at $\sqrt{s} = 13$ TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb$^{-1}$, combines data in the single-lepton and dilepton channels, and employs reconstruction techniques adapted to both the resolved and boosted topologies. A Bayesian unfolding procedure is performed to correct for detector resolution and acceptance effects. The combined inclusive $t\bar{t}$ charge asymmetry is measured to be $A_\text{C}^{t\bar{t}} = 0.0068 \pm 0.0015$, which differs from zero by 4.7 standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the $t\bar{t}$ system. Both the inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum chromodynamics perturbation theory with next-to-leading-order electroweak corrections. The measurements are interpreted in the framework of the Standard Model effective field theory, placing competitive bounds on several Wilson coefficients.

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The unfolded inclusive charge asymmetry. The measured values are given with statistical and systematic uncertainties. The SM theory predictions calculated at NNLO in QCD and NLO in EW theory are listed, and the impact of the linear term of the Wilson coefficient on the $A_C^{t\bar{t}}$ prediction is shown for two different values. The scale uncertainty is obtained by varying renormalisation and factorisation scales independently by a factor of 2 or 0.5 around $\mu_0$ to calculate the maximum and minimum value of the asymmetry, respectively. The nominal value $\mu_0$ is chosen as $H_T/4$. The variations in which one scale is multiplied by 2 while the other scale is divided by 2 are excluded. Finally, the scale and MC integration uncertainties are added in quadrature.

The unfolded differential charge asymmetry as a function of the invariant mass of the top pair system. The measured values are given with statistical and systematic uncertainties. The SM theory predictions calculated at NNLO in QCD and NLO in EW theory are listed, and the impact of the linear term of the Wilson coefficient on the $A_C^{t\bar{t}}$ prediction is shown for two different values. The scale uncertainty is obtained by varying renormalisation and factorisation scales independently by a factor of 2 or 0.5 around $\mu_0$ to calculate the maximum and minimum value of the asymmetry, respectively. The nominal value $\mu_0$ is chosen as $H_T/4$. The variations in which one scale is multiplied by 2 while the other scale is divided by 2 are excluded. Finally, the scale and MC integration uncertainties are added in quadrature.

The unfolded differential charge asymmetry as a function of the transverse momentum of the top pair system. The measured values are given with statistical and systematic uncertainties. The SM theory predictions calculated at NNLO in QCD and NLO in EW theory are listed. The scale uncertainty is obtained by varying renormalisation and factorisation scales independently by a factor of 2 or 0.5 around $\mu_0$ to calculate the maximum and minimum value of the asymmetry, respectively. The nominal value $\mu_0$ is chosen as $H_T/4$. The variations in which one scale is multiplied by 2 while the other scale is divided by 2 are excluded. Finally, the scale and MC integration uncertainties are added in quadrature.

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Measurement of Neutrino - Proton and anti-neutrino - Proton Elastic Scattering

Ahrens, L.A. ; Aronson, S.H. ; Connolly, P.L. ; et al.
Phys.Rev.D 35 (1987) 785, 1987.
Inspire Record 18763 DOI 10.17182/hepdata.23350

Measurements of the semileptonic weak-neutral-current reactions νμp→νμp and ν¯μp→ν¯μp are presented. The experiment was performed using a 170-metric-ton high-resolution target detector in the BNL wide-band neutrino beam. High-statistics samples yield the absolute differential cross sections dσ(νμp)/dQ2 and dσ(ν¯μp)/dQ2. A measurement of the axial-vector form factor GA(Q2) is also presented. The results are in good agreement with the standard model SU(2)×U(1). The weak-neutral-current parameter sin2thetaW is determined to be sin2θW=0.220±0.016(stat)−0.031+0.023(syst).

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Errors contain both statistics and systematics, except for additional overall normalisation error given above. Neutrino energy is 0 to 5 GeV with peak at 0.8 Gev.


Determination of electroweak parameters from the elastic scattering of muon-neutrinos and anti-neutrinos on electrons

Ahrens, L.A. ; Aronson, S.H. ; Connolly, P.L. ; et al.
Phys.Rev.D 41 (1990) 3297-3316, 1990.
Inspire Record 306084 DOI 10.17182/hepdata.22936

Total and differential cross sections for νμe→νμe and ν¯μe→ν¯μe are measured. Values for the model-independent neutral-current couplings of the electron are found to be gV=−0.107±0.035(stat)±0.028(syst) and gA=−0.514±0.023(stat)±0.028(syst). The electroweak mixing parameter sin2θW is determined to be 0.195±0.018(stat)±0.013(syst). Limits are set for the charge radius and magnetic moment of the neutrino as (〈r2〉)<0.24×10−32 cm2 and fμ<0.85×10−9 Bohr magnetons, respectively.

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Vector analyzing power iT11 in pi d elastic scattering at 49 MeV

Kohler, M. ; King, B.E. ; Stevenson, N.R. ; et al.
Phys.Rev.C 49 (1994) 1715-1717, 1994.
Inspire Record 389448 DOI 10.17182/hepdata.25990

Measurements of the vector analyzing power iT11 in πd elastic scattering at 49 MeV have been performed using a dynamically polarized target and a magnetic spectrometer. Data at seven π+ laboratory scattering angles between 50° and 130° were taken together with a complementary measurement at 60° for π−d elastic scattering. In general, we find agreement with models that include the πN P11 amplitude and disagreement with models that exclude or suppress it.

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SOFT PI+ MESONS IN P A AND PI- A INTERACTIONS. (IN RUSSIAN)

Vorobev, L.S. ; Gavrilov, V.B. ; Goryainov, N.A. ; et al.
MOSCOW INST. THEOR. EXP. PHYS. - ITEF-88-072 (88,REC.JAN.89) 25p, 1988.
Inspire Record 270427 DOI 10.17182/hepdata.40033

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SEARCH FOR EXOTIC BARYON RESONANCES WITH ISOSPIN I = 5/2 IN pi+ p REACTIONS AT 3.94-GeV/c pi+ MESON MOMENTA

Arefev, A.V. ; Bayukov, Yu.D. ; Grishuk, Yu.G. ; et al.
ITEP-86-150, 1986.
Inspire Record 234870 DOI 10.17182/hepdata.40112

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STUDY OF THE BARYON EXCHANGE REACTION pi+ p ---> DELTA++ rho0 AT MOMENTUM 3.94-GeV/c

Arefev, A.V. ; Bayukov, Yu.D. ; Grishuk, Yu.G. ; et al.
ITEP-86-76, 1986.
Inspire Record 230667 DOI 10.17182/hepdata.40119

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MEASUREMENT OF pi- d BACKWARD ELASTIC SCATTERING CROSS-SECTIONS IN THE pi- MESON MOMENTUM INTERVALS FROM 0.74-GeV/c TO 1.3-GeV/c

Arefev, A.V. ; Bayukov, Yu.D. ; Buklei, A.E. ; et al.
ITEP-49-1978, 1978.
Inspire Record 131151 DOI 10.17182/hepdata.40259

None

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RESULTS OF ELECTRONIC EXPERIMENTS IN STUDYING THE REACTION alpha (pi+-, p) + A (C, Al, Cu, Cd, Pb) ---> LAMBDA0 + X

Vorobev, L.S. ; Gavrilov, V.B. ; Goryainov, N.A. ; et al.
ITEP-89-27, 1989.
Inspire Record 278858 DOI 10.17182/hepdata.40114

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Alpha particle emission in the interaction of $^{12}$C with $^{59}$Co and $^{93}$Nb at incident energies of 300 and 400 MeV

Gadioli, E. ; Cavinato, M. ; Fabrici, E. ; et al.
Nucl.Phys.A 654 (1999) 523-540, 1999.
Inspire Record 1389772 DOI 10.17182/hepdata.36165

The results of measured inclusive double differential cross section of α particles emitted in the interaction of 12C ions with 59Co and 93Nb at incident energies of 300 and 400 MeV are presented. The analysis of these data allows us to isolate the contributions of the different reaction mechanisms, thereby confirming previous conclusions of a comprehensive analysis of a large number of excitation function, forward recoil ranges and angular distributions of residues produced in the interaction of 12C with a target nucleus in the same mass range. In particular, the probabilities associated with α-particle reemission following incomplete fussion processes have been reaffirmed. Several refinements to the theoretical model proposed in earlier studies of the interaction of 12C with nuclei are presented.

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