Search for anomalous wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 tev | |
Khachatryan, V.1; Sirunyan, A. M.1; Tumasyan, A.1; Adam, W.2; Asilar, E.2; Bergauer, T.2; Brandstetter, J.2; Brondolin, E.2; Dragicevic, M.2; Eroe, J.2 | |
刊名 | Journal of high energy physics |
2017-02-07 | |
期号 | 2页码:45 |
关键词 | Flavour changing neutral currents Hadron-hadron scattering (experiments) Top physics |
ISSN号 | 1029-8479 |
DOI | 10.1007/jhep02(2017)028 |
通讯作者 | Khachatryan, v.() |
英文摘要 | Single top quark events produced in the t channel are used to set limits on anomalous wtb couplings and to search for top quark flavour-changing neutral current (fcnc) interactions. the data taken with the cms detector at the lhc in proton-proton collisions at and 8 tev correspond to integrated luminosities of 5.0 and 19.7 fb(-1), respectively. the analysis is performed using events with one muon and two or three jets. a bayesian neural network technique is used to discriminate between the signal and backgrounds, which are observed to be consistent with the standard model prediction. the 95% confidence level (cl) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor wtb couplings are measured to be vertical bar f (v) (r) vertical bar < 0.16,aeuro,vertical bar f (t) (l) vertical bar < 0.057, and - 0.049 < f (t) (r) < 0.048, respectively. for the fcnc couplings kappa (tug) and kappa (tcg), the 95% cl upper limits on coupling strengths are vertical bar kappa (tug)vertical bar/i > < 4.1 x 10(- 3) tev-1 and vertical bar kappa (tcg)vertical bar/lambda < 1.8 x 10(- 2) tev-1, where i > is the scale for new physics, and correspond to upper limits on the branching fractions of 2.0 x 10(-5) and 4.1 x 10(-4) for the decays t -> ug and t -> cg, respectively. |
WOS关键词 | P(P)OVER-BAR COLLISIONS ; STANDARD-MODEL ; HIGGS ; POLARIZATION ; TEVATRON ; EVENTS |
WOS研究方向 | Physics |
WOS类目 | Physics, Particles & Fields |
语种 | 英语 |
出版者 | SPRINGER |
WOS记录号 | WOS:000394750000001 |
内容类型 | 期刊论文 |
URI标识 | http://www.corc.org.cn/handle/1471x/2176778 |
专题 | 高能物理研究所 |
通讯作者 | Khachatryan, V. |
作者单位 | 1.Yerevan Phys Inst, Yerevan 375036, Armenia 2.Inst Hochenergiephys, Vienna, Austria 3.Natl Ctr Particle & High Energy Phys, Minsk, Byelarus 4.Univ Antwerp, Antwerp, Belgium 5.Vrije Univ Brussel, Brussels, Belgium 6.Univ Libre Bruxelles, Brussels, Belgium 7.Univ Ghent, Ghent, Belgium 8.Catholic Univ Louvain, Louvain La Neuve, Belgium 9.Univ Mons, Mons, Belgium 10.Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil |
推荐引用方式 GB/T 7714 | Khachatryan, V.,Sirunyan, A. M.,Tumasyan, A.,et al. Search for anomalous wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 tev[J]. Journal of high energy physics,2017(2):45. |
APA | Khachatryan, V..,Sirunyan, A. M..,Tumasyan, A..,Adam, W..,Asilar, E..,...&Oropeza Barrera, C..(2017).Search for anomalous wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 tev.Journal of high energy physics(2),45. |
MLA | Khachatryan, V.,et al."Search for anomalous wtb couplings and flavour-changing neutral currents in t-channel single top quark production in pp collisions at root s=7 and 8 tev".Journal of high energy physics .2(2017):45. |
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