Measurement of the t-channel single-top-quark production cross section and of the $\mid V_{tb} \mid$ CKM matrix element in pp collisions at $\sqrt{s}$= 8 TeV

Khachatryan, Vardan

doi:10.1007/JHEP06(2014)090

Title: Measurement of the t-channel single-top-quark production cross section and of the $$\mid V_{tb} \mid$$ CKM matrix element in pp collisions at $$\sqrt{s}$$= 8 TeV

Journal Article · Mon Jun 16 00:00:00 EDT 2014 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP06(2014)090· OSTI ID:1234825

Khachatryan, Vardan ^[1]

Yerevan Physics Inst. (YerPhI) (Armenia). et al.

Our measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at √s = 8 TeV. The results are based on a data sample corresponding to an integrated luminosity of 19.7 fb^-1 recorded with the CMS detector at the LHC. The cross section is measured inclusively, as well as separately for top (t) and antitop (t¯), in final states with a muon or an electron. The measured inclusive t-channel cross section is σ _t-ch. = 83.6 ± 2.3 (stat.) ± 7.4 (syst.) pb. The single t and t¯ cross sections are measured to be σ _t-ch.(t) = 53.8 ± 1.5 (stat.) ± 4.4 (syst.) pb and σ _t-ch. (t¯) = 27.6 ± 1.3 (stat.) ± 3.7 (syst.) pb, respectively. The measured ratio of cross sections is R_t-ch. = σ _t-ch.(t)/σ _t-ch. (t¯) = 1.95 ± 0.10 (stat.) ± 0.19 (syst.), in agreement with the standard model prediction. Finally, the modulus of the Cabibbo-Kobayashi-Maskawa matrix element V _tb is extracted and, in combination with a previous CMS result at √s = 7 TeV, a value |V_tb| = 0.998 ± 0.038 (exp.) ± 0.016 (theo.) is obtained.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: CMS Collaboration

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1234825

Report Number(s):: FERMILAB-PUB-14-073-CMS; CERN-PH-EP-2014-032; CMS-TOP-12-038; arXiv eprint number arXiv:1403.7366

Journal Information:: Journal of High Energy Physics (Online), Vol. 2014, Issue 6; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 96 works

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