Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS experiment - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue Physics Letters B Année : 2016

Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS experiment

G. Aad (1) , S. Albrand (2) , S. Berlendis (2) , C. Camincher (2) , J. Collot (2) , S. Crépé-Renaudin (2) , P.A. Delsart (2) , C. Gabaldon (2) , M.H. Genest (2) , J.Y. Hostachy (2) , F. Ledroit-Guillon (2) , A. Lleres (2) , A. Lucotte (2) , F. Malek (2) , E. Petit (2) , J. Stark (2) , B. Trocmé (2) , M. Wu (2) , G. Rahal (3) , L. Alio (1) , M. Barbero (1) , A. Calandri (1) , T.P. Calvet (1) , Y. Coadou (1) , C. Diaconu (1) , Sara Diglio (1) , F. Djama (1) , V. Ellajosyula (1) , L. Feligioni (1) , J. Gao (1) , A. Hadef (1) , G.D. Hallewell (1) , F. Hubaut (1) , S.J. Kahn (1) , E. B. F. G. Knoops (1) , E. Le Guirriec (1) , J. Liu (1) , K. Liu (1) , D. Madaffari (1) , K. Mochizuki (1) , E. Monnier (1) , S. Muanza (1) , Y. Nagai (1) , E. Nagy (1) , P. Pralavorio (1) , Y. Rodina (1) , A. Rozanov (1) , T. Theveneaux-Pelzer (1) , M. Talby (1) , R.E. Ticse Torres (1) , E. Tiouchichine (1) , S. Tisserant (1) , J. Toth (1) , F. Touchard (1) , L. Vacavant (1) , Chen Wang (1) , M.K. Ayoub (4) , A. Bassalat (4) , C. Bécot (4) , S. Binet (4) , C. Bourdarios (4) , D. Delgove (4) , J-B. de Vivie De Regie (4) , L. Duflot (4) , M. Escalier (4) , L. Fayard (4) , D. Fournier (4) , E.L. Gkougkousis (4) , J-F. Grivaz (4) , T. Guillemin (4) , F. Hariri (4) , S. Henrot-Versille (4) , J. Hrivnac (4) , L. Iconomidou-Fayard (4) , M. Kado (4) , A. Lounis (4) , N. Makovec (4) , N. Morange (4) , C. Nellist (4) , P. Petroff (4) , L. Poggioli (4) , P. Puzo (4) , A. Renaud (4) , D. Rousseau (4) , G. Rybkin (4) , A.C. Schaffer (4) , E. Scifo (4) , L. Serin (4) , S. Simion (4) , R. Tanaka (4) , D. Zerwas (4) , Zhongkai Zhang (4) , Y. Zhao (4) , Z. Barnovska (5) , N. Berger (5) , M. Delmastro (5) , L. Di Ciaccio (5) , S. Elles (5) , C. Goy (5) , T. Hryn’ova (5) , S. Jézéquel (5) , I. Koletsou (5) , R. Lafaye (5) , Jérémy Lévêque (5) , N. Massol (5) , P. Mastrandea (5) , G. Sauvage (5) , E. Sauvan (5) , O. Simard (5) , T. Todorov (5) , I. Wingerter-Seez (5) , E. Yatsenko (5) , D. Boumediene (6) , E. Busato (6) , D. Calvet (6) , S. Calvet (6) , A.R. Chomont (6) , J. Donini (6) , Ph. Gris (6) , H. Liao (6) , R. Madar (6) , D. Pallin (6) , S.M. Romano Saez (6) , C. Santoni (6) , D. Simon (6) , F. Vazeille (6) , T. Beau (7) , M. Bomben (7) , G. Calderini (7) , F. Crescioli (7) , S. de Cecco (7) , A. Demilly (7) , F. Derue (7) , P. Francavilla (7) , M.W. Krasny (7) , D. Lacour (7) , B. Laforge (7) , S. Laplace (7) , O. Le Dortz (7) , G. Lefebvre (7) , A. Lopez Solis (7) , B. Malaescu (7) , G. Marchiori (7) , J. Ocariz (7) , C.E. Pandini (7) , S. Pires (7) , M. Ridel (7) , L. Roos (7) , S. Trincaz-Duvoid (7) , D. Varouchas (7) , Y.C. Yap (7)
G. Aad
Y. Coadou
Chen Wang
  • Fonction : Auteur
  • PersonId : 829307
D. Rousseau
N. Berger
C. Goy
T. Hryn’ova
S. Calvet

Résumé

In the $pp \rightarrow t\bar{t}$ process the angular distributions of top and anti-top quarks are expected to present a subtle difference, which could be enhanced by processes not included in the Standard Model. This Letter presents a measurement of the charge asymmetry in events where the top-quark pair is produced with a large invariant mass. The analysis is performed on 20.3 fb$^{-1}$ of $pp$ collision data at $\sqrt{s} =$ 8 TeV collected by the ATLAS experiment at the LHC, using reconstruction techniques specifically designed for the decay topology of highly boosted top quarks. The charge asymmetry in a fiducial region with large invariant mass of the top-quark pair ($m_{t\bar{t}} > $ 0.75 TeV) and an absolute rapidity difference of the top and anti-top quark candidates within $-$2 $ < |y_t| - |y_{\bar{t}}| <$ 2 is measured to be 4.2 $\pm$ 3.2%, in agreement with the Standard Model prediction at next-to-leading order. A differential measurement in three $t\bar{t}$ mass bins is also presented.

Dates et versions

in2p3-01247039 , version 1 (21-12-2015)

Identifiants

Citer

G. Aad, S. Albrand, S. Berlendis, C. Camincher, J. Collot, et al.. Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s} =$ 8 TeV $pp$ collision data collected by the ATLAS experiment. Physics Letters B, 2016, 756, pp.52-71. ⟨10.1016/j.physletb.2016.02.055⟩. ⟨in2p3-01247039⟩
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