A measurement of the energy asymmetry in jet-associated top-quark pair production is presented using 139 fb(-1) of data collected by the ATLAS detector at the Large Hadron Collider during pp collisions at root s = 13 TeV. The observable measures the different probability of top and antitop quarks to have the higher energy as a function of the jet scattering angle with respect to the beam axis. The energy asymmetry is measured in the semileptonic t (t) over bar decay channel, and the hadronically decaying top quark must have transverse momentum above 350 GeV. The results are corrected for detector effects to particle level in three bins of the scattering angle of the associated jet. The measurement agrees with the SM prediction at next-to-leading-order accuracy in quantum chromodynamics in all three bins. In the bin with the largest expected asymmetry, where the jet is emitted perpendicular to the beam, the energy asymmetry is measured to be -0.043 +/- 0.020, in agreement with the SM prediction of -0.037 +/- 0.003. Interpreting this result in the framework of the Standard Model effective field theory (SMEFT), it is shown that the energy asymmetry is sensitive to the top-quark chirality in four-quark operators and is therefore a valuable new observable in global SMEFT fits.
Measurement of the energy asymmetry in tt̅j production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework
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Maurer J; Macek B; Maximov DA; Mazini R; Maznas I; Mazza SM; McGinn C; McGowan JP; McKee SP; McCarthy TG; McCormack WP; McDonald EF; McDougall AE; Mcfayden JA; Mchedlidze G; McKay MA; Mclaughlin DJ; McLean KD; McMahon SJ; McNamara PC; McPherson RA; Mdhluli JE; Meadows ZA; Meehan S; Megy T; Mehlhase S; Mehta A; Meirose B; Melini D; Garcia BRM; Melo AH; Meloni F; Melzer A; Gouveia EDM; Da Costa AMMJ; Meng HY; Meng L; Menke S; Mentink M; Meoni E; Merlassino C; Mermod P; Merola L; Meroni C; Merz G; Meshkov O; Meshreki JKR; Metcalfe J; Mete AS; Meyer C; Meyer JP; Michetti M; Middleton RP; Mijovic L; Mikenberg G; Mikestikova M; Mikuz M; Mildner H; Milic A; Milke CD; Miller DW; Miller LS; Milov A; Milstead DA; Min T; Minaenko AA; Minashvili IA; Mince L; Mincer AI; Mindur B; Mineev M; Minegishi Y; Mino Y; Mir LM; Lopez MM; Mironova M; Mitani T; Mitsou VA; Mittal M; Miu O; Miyagawa PS; Miyazaki Y; Mizukami A; Mjornmark JU; Mkrtchyan T; Mlynarikova M; Moa T; Mobius S; Mochizuki K; Moder P; Mogg P; 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