Title
Inclusive and differential measurements of the tt¯ charge asymmetry in pp collisions at √s=8 TeV
Date Issued
10 June 2016
Access level
open access
Resource Type
journal article
Author(s)
Khachatryan V.
Sirunyan A.M.
Tumasyan A.
Adam W.
Asilar E.
Bergauer T.
Brandstetter J.
Brondolin E.
Dragicevic M.
Erö J.
Flechl M.
Friedl M.
Frühwirth R.
Ghete V.M.
Hartl C.
Hörmann N.
Hrubec J.
Jeitler M.
Knünz V.
König A.
Krammer M.
Krätschmer I.
Liko D.
Matsushita T.
Mikulec I.
Rabady D.
Rahbaran B.
Rohringer H.
Schieck J.
Schöfbeck R.
Strauss J.
Treberer-Treberspurg W.
Waltenberger W.
Wulz C.E.
Mossolov V.
Shumeiko N.
Suarez Gonzalez J.
Alderweireldt S.
Cornelis T.
De Wolf E.A.
Janssen X.
Knutsson A.
Lauwers J.
Luyckx S.
Ochesanu S.
Rougny R.
Van De Klundert M.
Van Haevermaet H.
Van Mechelen P.
Van Remortel N.
Van Spilbeeck A.
Abu Zeid S.
Blekman F.
D'Hondt J.
Daci N.
De Bruyn I.
Deroover K.
Heracleous N.
Keaveney J.
Lowette S.
Moreels L.
Olbrechts A.
Python Q.
Strom D.
Tavernier S.
Van Doninck W.
Van Mulders P.
Van Onsem G.P.
Van Parijs I.
Barria P.
Caillol C.
Clerbaux B.
De Lentdecker G.
Delannoy H.
Fasanella G.
Favart L.
Gay A.P.R.
Grebenyuk A.
Lenzi T.
Léonard A.
Maerschalk T.
Marinov A.
Perniè L.
Randle-conde A.
Reis T.
Seva T.
Vander Velde C.
Vanlaer P.
Yonamine R.
Zenoni F.
Zhang F.
Beernaert K.
Benucci L.
Cimmino A.
Crucy S.
Dobur D.
Fagot A.
Garcia G.
Gul M.
Mccartin J.
Publisher(s)
Elsevier B.V.
Abstract
The tt¯ charge asymmetry is measured in proton–proton collisions at a centre-of-mass energy of 8 TeV. The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb−1. Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010±0.0068 (stat)±0.0037 (syst). In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt¯ system are studied. For the first time at the LHC, the measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of −0.0035±0.0072 (stat)±0.0031 (syst). All measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.
Start page
154
End page
179
Volume
757
Language
English
OCDE Knowledge area
Física y Astronomía
Subjects
Scopus EID
2-s2.0-85040812909
Source
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ISSN of the container
03702693
Sponsor(s)
Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation ; the A.P. Sloan Foundation ; the Alexander von Humboldt Foundation ; the Belgian Federal Science Policy Office ; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research , India; the HOMING PLUS programme of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund ; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF ; the National Priorities Research Program by Qatar National Research Fund ; the Rachadapisek Sompot Fund for Postdoctoral Fellowship , Chulalongkorn University (Thailand); and the Welch Foundation .
We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq , CAPES , FAPERJ , and FAPESP (Brazil); MES (Bulgaria); CERN ; CAS , MoST , and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER , ERC IUT and ERDF (Estonia); Academy of Finland , MEC , and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF , DFG , and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV , CONACYT , SEP , and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON , RosAtom , RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter , IPST , STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA).
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