Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector
文献类型：期刊论文
| 作者 | Aaboud, M.197,198; Aad, G.127,128; Abbott, B.159; Abdallah, J.11; Abdinov, O.15; Abeloos, B.163; Abidi, S. H.229; AbouZeid, O. S.201; Abraham, N. L.218; Abramowicz, H.222 |
| 刊名 | Journal of high energy physics
 |
| 出版日期 | 2017-12-04 |
| 期号 | 12页码:60 |
| 关键词 | Electroweak interaction Hadron-hadron scattering (experiments) Top physics |
| ISSN号 | 1029-8479 |
| DOI | 10.1007/jhep12(2017)017 |
| 通讯作者 | Aaboud, m.(atlas.publications@cern.ch) |
| 英文摘要 | The electroweak production and subsequent decay of single top quarks in the t-channel is determined by the properties of the wtb vertex, which can be described by the complex parameters of an effective lagrangian. an analysis of a triple-differential decay rate in t-channel production is used to simultaneously determine five generalised helicity fractions and phases, as well as the polarisation of the produced top quark. the complex parameters are then constrained. this analysis is based on 20.2 fb(-1) of proton-proton collision data at a centre-of-mass energy of 8 tev collected with the atlas detector at the lhc. the fraction of decays containing transversely polarised w bosons is measured to be f(1) = 0.30 +/- 0.05. the phase between amplitudes for transversely and longitudinally polarised w bosons recoiling against left-handed b-quarks is measured to be delta = 0.002 pi(+0.016 pi)(+0.017 pi), giving no indication of cp violation. the fractions of longitudinal or transverse w bosons accompanied by right-handed b-quarks are also constrained. based on these measurements, limits are placed at 95% cl on the ratio of the complex coupling parameters re [g(r)/v-l is an element of [-0.12, 0.17] and im [g(r)/v-l is an element of [-0.07, 0.06]. constraints are also placed on the ratios vertical bar v-r/v-l vertical bar and vertical bar g(l)/v-l vertical bar. in addition, the polarisation of single top quarks in the t-channel is constrained to be p > 0.72 (95% cl). none of the above measurements make assumptions about the value of any of the other parameters or couplings and all of them are in agreement with the standard model. |
| WOS关键词 | HADRON COLLIDERS ; PARTON DISTRIBUTIONS ; PAIR PRODUCTION ; HEAVY QUARKS ; MONTE-CARLO ; SPIN ; LHC ; POLARIZATION ; QCD |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Particles & Fields |
| 语种 | 英语 |
| WOS记录号 | WOS:000417756900002 |
| 出版者 | SPRINGER |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2177845 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Aaboud, M. |
| 作者单位 | 1.Univ Adelaide, Dept Phys, Adelaide, SA, Australia 2.SUNY Albany, Phys Dept, Albany, NY USA 3.Univ Alberta, Dept Phys, Edmonton, AB, Canada 4.Ankara Univ, Dept Phys, Ankara, Turkey 5.Istanbul Aydin Univ, Istanbul, Turkey 6.TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey 7.CNRS, IN2P3, LAPP, Annecy Le Vieux, France 8.Univ Savoie Mt Blanc, Annecy Le Vieux, France 9.Argonne Natl Lab, High Energy Phys Div, Argonne, IL USA 10.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA |
| 推荐引用方式 GB/T 7714 | Aaboud, M.,Aad, G.,Abbott, B.,et al. Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector[J]. Journal of high energy physics,2017(12):60. |
| APA | Aaboud, M..,Aad, G..,Abbott, B..,Abdallah, J..,Abdinov, O..,...&Haleem, M..(2017).Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector.Journal of high energy physics(12),60. |
| MLA | Aaboud, M.,et al."Analysis of the wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at root s=8 tev with the atlas detector".Journal of high energy physics .12(2017):60. |
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