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Published April 25, 2013 | Supplemental Material + Published + Submitted
Journal Article Open

Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at √s = 7 TeV


The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at √s=7  TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0  fb^(-1), recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of tt Z events and a same-sign dilepton analysis of tt̅ V (V=W or Z) events. In the trilepton channel a direct measurement of the tt Z cross section σ_(ttZ)=0.28_(-0.11)^(+0.14) (stat)_(-0.03)^(+0.06) (syst)  pb is obtained. In the dilepton channel a measurement of the tt̅ V cross section yields σ_(ttV) =0.43_(-0.15)^(+0.17) (stat)_(-0.07)^(+0.09) (syst)  pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137_(-0.016)^(+0.012) and 0.306_(-0.053)^(+0.031)  pb.

Additional Information

© 2013 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Received 13 March 2013; published 25 April 2013. 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 centers 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: BMWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MEYS (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); MoER, SF0690030s09,and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF(Germany);GSRT (Greece);OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Republic of Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MSI (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MON, RosAtom, RAS, and RFBR (Russia); MSTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); ThEPCenter, IPST and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA).

Attached Files

Published - PhysRevLett.110.172002.pdf

Submitted - 1303.3239v2.pdf

Supplemental Material - README.TXT

Supplemental Material - TOP-12-014_supp-jnl.pdf


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