Measurement of the mass difference between top and antitop quarks

A measurement of the mass difference between the top quark and the antitop quark (Δmt = mt − mt̄) is performed using events with a muon or an electron and at least four jets in the final state. Data collected in 2011 with the CMS detector at the LHC and corresponding to an integrated luminosity of 4.96 ± 0.11 fb−1 are analyzed. The measured value of Δmt = −0.44 ± 0.46 (stat.) ± 0.27 (syst.) GeV is consistent with the expectation of CPT invariance, and provides a significantly improved precision relative to existing measurements.

R. E. Hall | R. K. Shivpuri | T. J. Kim | S. Malik | R. Moore | R. Lipton | J. Bartlett | K. Herner | H. Diehl | G. Wilson | A. Tanasijczuk | M. Lokajicek | A. Heinson | D. Mackin | T. Scanlon | D. Claes | M. Cousinou | M. Buehler | M. Abolins | B. Acharya | M. Ahsan | L. Ancu | T. Andeen | B. Åsman | S. Beale | M. Begel | C. Bélanger-Champagne | R. Bernhard | G. Borissov | A. Brandt | R. Brock | G. Brooijmans | S. Burdin | C. Buszello | P. Calfayan | S. Calvet | D. Chakraborty | K. Chan | E. Cheu | M. Cooke | S. Crépé-Renaudin | K. De | L. Duflot | M. Escalier | H. Evans | F. Fiedler | F. Filthaut | H. Fox | T. Gadfort | C. Galea | C. García | D. Gillberg | A. Goussiou | Z. Greenwood | P. Gris | J. Grivaz | J. Guo | P. Gutierrez | A. Haas | P. Haefner | C. Hensel | G. Hesketh | J. Hobbs | M. Hohlfeld | Z. Hubacek | K. Jakobs | D. Jamin | K. Johns | V. Kaushik | R. Kehoe | A. Khanov | T. Kuhl | A. Kupco | J. Kvita | J. Linnemann | Y. Liu | P. Love | H. Lubatti | P. Mättig | P. Mal | V. Malyshev | B. Martin | R. Mccarthy | J. Mitrevski | H. Nilsen | T. Nunnemann | J. Parsons | B. Penning | K. Peters | R. Piegaia | M. Pleier | S. Protopopescu | J. Qian | A. Quadt | M. Rijssenbeek | F. Rizatdinova | C. Royon | M. Sanders | L. Sawyer | D. Schaile | R. Schamberger | C. Schwanenberger | R. Schwienhorst | H. Severini | E. Shabalina | M. Shamim | V. Šimák | P. Skubic | J. Snow | M. Sosebee | B. Spurlock | J. Stark | J. Strandberg | M. Strang | E. Strauss | M. Strauss | R. Ströhmer | D. Strom | W. Taylor | I. Torchiani | D. Tsybychev | P. Tuts | P. Vokac | G. Watts | D. Wicke | C. Xu | S. Yacoob | C. Zeitnitz | B. Zhou | J. Zhu | D. Zieminska | L. Živković | V. Zutshi | Y. Enari | M. Aoki | S. Banerjee | M. Begalli | P. Ratoff | G. Sajot | L. Vertogradov | D. Vilanova | M. Voutilainen | M. Wayne | S. Denisov | G. Facini | A. Grohsjean | M. Owen | T. Wyatt | J. Lellouch | G. Alves | W. Carvalho | L. Mundim | H. Nogima | E. Gregores | P. Mercadante | S. Novaes | M. Besançon | M. Titov | C. Ochando | T. Kurca | P. Verdier | T. Hebbeker | A. Meyer | L. Sonnenschein | S. Beri | V. Bhatnagar | J. Kohli | B. Choudhary | M. Naimuddin | K. Ranjan | N. Mondal | S. Choi | S. Park | H. Castilla-Valdez | A. Sanchez-Hernandez | M. Ćwiok | P. Bargassa | L. Uvarov | V. Gavrilov | G. Safronov | V. Stolin | L. Dudko | M. Perfilov | E. Aguiló | K. Harder | R. Beuselinck | G. Davies | J. Hays | T. Bose | D. Cutts | A. Ferapontov | U. Heintz | S. Jabeen | G. Landsberg | M. Narain | J. Ellison | S. Sumowidagdo | S. Wimpenny | P. Bhat | S. Cihangir | W. Cooper | V. Elvira | M. Johnson | B. Klima | D. Lincoln | T. Adams | A. Askew | S. Hagopian | M. Adams | C. Gerber | F. Lacroix | N. Varelas | P. Baringer | A. Bean | A. Barfuss | T. Bolton | Y. Maravin | S. Eno | K. Bloom | M. Eads | H. Malbouisson | G. Snow | I. Iashvili | A. Kharchilava | G. Alverson | E. Barberis | M. Hildreth | R. Ruchti | J. Hegeman | C. Tully | H. Yoo | N. Parashar | R. Demina | A. Garcia-Bellido | A. Harel | O. Atramentov | D. Duggan | Y. Gershtein | R. Hirosky | V. Abazov | B. Abbott | G. Alexeev | A. Alton | C. Avila | F. Badaud | L. Bagby | B. Baldin | D. Bandurin | L. Bellantoni | G. Bernardi | I. Bertram | G. Blazey | S. Blessing | A. Boehnlein | D. Boline | A. Bross | D. Brown | X. Bu | V. Buescher | V. Bunichev | B. Casey | S. Chakrabarti | A. Chandra | D. Cho | J. Clutter | M. Corcoran | F. Couderc | A. Das | S. de Jong | E. De La Cruz-Burelo | D. Denisov | S. Desai | K. Devaughan | M. Diesburg | A. Dominguez | A. Dubey | A. Duperrin | S. Dutt | A. Dyshkant | D. Edmunds | A. Evdokimov | V. Evdokimov | T. Ferbel | W. Fisher | H. Fisk | M. Fortner | S. Fuess | P. Gay | W. Geng | G. Ginther | P. Grannis | S. Greder | H. Greenlee | G. Grenier | S. Grünendahl | M. Grünewald | G. Gutiérrez | J. Haley | L. Han | J. Hauptman | D. Hedin | I. Heredia-De La Cruz | T. Hoang | B. Hoeneisen | V. Hynek | R. Illingworth | A. Ito | M. Jaffré | R. Jesik | A. Jonckheere | P. Jonsson | A. Juste | E. Kajfasz | D. Karmanov | P. Kasper | I. Katsanos | S. Kermiche | N. Khalatyan | Y. Kharzheev | M. Kirby | A. Kozelov | J. Kraus | A. Kumar | V. Kuzmin | S. Lammers | L. Li | Q. Li | J. Lim | V. Lipaev | A. Lobodenko | R. Luna-García | A. Lyon | A. Maciel | R. Magaña-Villalba | B. Calpas | T. Dorland | D. Wood | J. Meyer | A. Sopczak | M. Weber | S. Park | M. Takahashi | S. Jain | G. Alkhazov | E. Boos | C. McGivern | M. M. Meijer | A. Melnitchouk | D. Menezes | M. Merkin | M. Mulhearn | E. Nagy | H. Neal | J. Negret | P. Neustroev | J. Orduna | N. Osman | J. Osta | M. Padilla | R. Partridge | N. Parua | A. Patwa | Y. Peters | P. Pétroff | P. Podesta-Lerma | V. Podstavkov | A. Popov | B. Quinn | M. Rangel | P. Renkel | I. Ripp-Baudot | M. Rominsky | P. Rubinov | G. Savage | Y. Scheglov | H. Schellman | J. Sekaric | V. Shary | A. Shchukin | P. Slattery | S. Söldner-Rembold | K. Soustruznik | D. Stoyanova | P. Svoisky | V. Tokmenin | B. Tuchming | S. Uvarov | S. Uzunyan | I. Vasilyev | M. Verzocchi | H. Wahl | M. Wang | J. Warchoł | L. Welty-Rieger | A. White | M. Williams | M. Wobisch | R. Yamada | T. Yasuda | Y. Yatsunenko | Z. Ye | H. Yin | K. Yip | T. Zhao | G. Muanza | Y. Xie | M. Demarteau | D. Onoprienko | Y. Hu | T. Moulik | A. Rakitine | P. Polozov | J. Li | G. Weber | W. Prado Da Silva | Z. Liu | M. Arov | J. Backusmayes | J. Barreto | V. Bezzubov | T. Burnett | M. Carrasco-Lizarraga | N. Huske | S. Lietti | G. Obrant | B. Sanghi | T. Schliephake | S. Schlobohm | V. Sirotenko | S. Snyder | L. Stutte | S. Zelitch | P. Lebrun | D. Smirnov | M. Anzelc | Y. Arnoud | M. Arthaud | D. Bauer | A. Bellavance | J. Benitez | D. Buchholz | J. Cammin | E. Carrera | T. Christoudias | S. Fu | W. Geist | B. Gomez | F. Guo | I. Hall | S. Hossain | P. Houben | C. Johnson | D. Johnston | D. Khatidze | M. Kirsch | J. Konrath | D. Lam | A. Leflat | A. Magerkurth | L. Mendoza | K. Merritt | O. Mundal | N. Oshima | R. Otec | G. Otero y Garzon | P. Padley | M. Pangilinan | G. Pawloski | J. Piper | Y. Pogorelov | P. Rich | S. Robinson | V. Siccardi | B. Tiller | R. Unalan | P. J. van den Berg | R. Van Kooten | P. Vint | R. Wagner | A. Wenger | M. Wetstein | W. Yang | S. Youn | J. Yu | E. Varnes | E. Zverev | I. Nikolaev | M. Pol | W. M. V. van Leeuwen | M. Zielinski | U. Bassler | W. Lee | F. Déliot | Y. Xie

[1]  G. Bruno,et al.  Measurement of the tt̄ production cross section in pp collisions at 7 TeV in lepton+jets events using b-quark jet identification , 2011 .

[2]  V. M. Ghete,et al.  Determination of jet energy calibration and transverse momentum resolution in CMS , 2011 .

[3]  T. Tuuva,et al.  Measurement of the inclusive W and Z production cross sections in pp collisions at $ \sqrt {s} = 7 $ TeV with the CMS experiment , 2011 .

[4]  The Cms Collaboration,et al.  Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions at sqrt(s) = 7 TeV , 2011, 1107.4789.

[5]  C. Collaboration,et al.  Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS , 2011, 1107.4277.

[6]  D. Collaboration.  Direct measurement of the mass difference between top and antitop quarks , 2011, 1204.2807.

[7]  R. Frühwirth,et al.  Measurement of the $\mathrm{{t\bar{t}}}$ production cross section in pp collisions at $\sqrt{s}=7$ TeV using the kinematic properties of events with leptons and jets , 2011, 1106.0902.

[8]  F. Maltoni,et al.  MadGraph 5: going beyond , 2011, 1106.0522.

[9]  A. A. Ocampo Rios,et al.  Measurement of the t t-bar production cross section and the top quark mass in the dilepton channel in pp collisions at sqrt(s) = 7 TeV , 2011, 1105.5661.

[10]  E. al.,et al.  Precise measurement of the top-quark mass fromlepton+jetsevents at D0 , 2011, 1105.6287.

[11]  Serguei Chatrchyan,et al.  Measurement of the lepton charge asymmetry ininclusive W production in pp collisions at √s = 7TeV , 2011 .

[12]  T. Tuuva,et al.  Measurement of the lepton charge asymmetry in inclusive W production in pp collisions at $ \sqrt {s} = 7\;{\text{TeV}} $ , 2011 .

[13]  M. Dorigo,et al.  Measurement of the mass difference between t and t quarks. , 2011, Physical review letters.

[14]  Chiochia,et al.  Measurement of the t¯t production cross section in pp collisions at √s = 7 TeV using the kinematic properties of events with leptons and jets , 2011 .

[15]  D. Newbold,et al.  Measurement of the tt̄ production cross section in pp collisions at √ s = 7 TeV using the kinematic properties of events with leptons and jets , 2011 .

[16]  V. M. Ghete,et al.  Performance of CMS muon reconstruction in cosmic-ray events , 2010 .

[17]  D. Whiteson,et al.  Top quark mass measurement in the lepton + jets channel using a matrix element method and in situ jet energy calibration. , 2010, Physical review letters.

[18]  J. Campbell,et al.  MCFM for the Tevatron and the LHC , 2010, 1007.3492.

[19]  T. Ferbel.  Direct Measurement of the Mass Difference Between Top and Antitop Quarks , 2010 .

[20]  CMS Collaboration.  Performance of CMS muon reconstruction in cosmic-ray events , 2010 .

[21]  Electron reconstruction and identification at √ s = 7 TeV The CMS Collaboration , 2010 .

[22]  N. Remortel,et al.  Calibration of the jet energy scale using top quark events at the LHC , 2010 .

[23]  C. Collaboration,et al.  Performance of CMS Muon Reconstruction in Cosmic-Ray Events , 2009, 0911.4994.

[24]  João Paulo Teixeira,et al.  The CMS experiment at the CERN LHC , 2008 .

[25]  R. E. Hall,et al.  Precise measurement of the top-quark mass from lepton + jets events. , 2008, Physical review letters.

[26]  M. Cacciari,et al.  The anti-$k_t$ jet clustering algorithm , 2008, 0802.1189.

[27]  J. Huston,et al.  Implications of CTEQ global analysis for collider observables , 2008, 0802.0007.

[28]  Lyndon Evans,et al.  LHC Machine , 2008 .

[29]  P. Nason,et al.  Matching NLO QCD computations with Parton Shower simulations: the POWHEG method , 2007, 0709.2092.

[30]  E. al.,et al.  Measurement of the top quark mass in the lepton+jets channel using the Ideogram Method , 2007, hep-ex/0702018.

[31]  M. Feindt,et al.  Measurement of the top-quark mass in all-hadronic decays in pp collisions at CDF II. , 2006, Physical review letters.

[32]  M. Mangano,et al.  Matching matrix elements and shower evolution for top-pair production in hadronic collisions , 2006, hep-ph/0611129.

[33]  M. Feindt,et al.  Measurements of inclusive W and Z cross sections in pp collisions at √ s = 1.96TeV , 2007 .

[34]  Johannes Weber,et al.  The D0 Collaboration , 2022 .

[35]  K. Melnikov,et al.  Electroweak gauge boson production at hadron colliders through O(alpha(s)**2) , 2006, hep-ph/0609070.

[36]  S. Incerti,et al.  Geant4 developments and applications , 2006, IEEE Transactions on Nuclear Science.

[37]  Jorgen D'Hondt,et al.  Fitting of Event Topologies with External Kinematic Constraints in CMS , 2006 .

[38]  M. Snir,et al.  Report No , 2005 .

[39]  R. Barlow.  Systematic Errors: facts and fictions , 2002, hep-ex/0207026.

[40]  S. Mrenna,et al.  Pythia 6.3 physics and manual , 2003, hep-ph/0308153.

[41]  ...................................................  MINOS COLLABORATION , 2001 .

[42]  D. J. Miller,et al.  (Submitted to Physics Letters B) The OPAL Collaboration , 2000 .

[43]  Gerald C. Blazey et al..  Run II jet physics: Proceedings of the Run II QCD and weak boson physics workshop , 2000 .

[44]  Hayes,et al.  Review of Particle Physics. , 1996, Physical review. D, Particles and fields.

[45]  Cross Sections.  For the CDF Collaboration , 1994 .

[46]  A. Pais.  Niels Bohr and the Development of Physics , 1988 .

[47]  Rupert G. Miller.  The jackknife-a review , 1974 .

[48]  Commissioning of the Particle-Flow Reconstruction in Minimum-Bias and Jet Events from pp Collisions at 7 TeV The CMS Collaboration , 2022 .