Prospects of measuring the CKM matrix element |Vts| at the LHC

被引：9

作者：

Ali, Ahmed ^{[1
]}

Barreiro, Fernando ^{[2
]}

Lagouri, Theodota ^{[2
]}

机构：

[1] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany

[2] Univ Autonoma Madrid, Fac Ciencias C11, Dept Fis, E-28049 Madrid, Spain

来源：

PHYSICS LETTERS B | 2010年 / 693卷 / 01期

关键词：

CKM matrix; unitarity; Top quark decays; Rare decay; Electroweak interaction; LHC physics; TOP-QUARK; RESUMMATION;

D O I：

10.1016/j.physletb.2010.08.014

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the prospects of measuring the CKM matrix element vertical bar V-ts vertical bar at the LHC with the top quarks produced in the processes pp -> t (t) over barX and pp -> t/(t) over barX, and the subsequent decays t -> W(+)s and (t) over bar -> W-(s) over bar To reduce the jet activity in top quark decays, we insist on tagging the W leptonically, W +/- -> l(+/-)vl (l = e, u, r), and analyse the anticipated jet profiles in the signal process t -> Ws and the dominant background from the decay t -> Wb. To that end, we analyse the V0 (K-0 and A) distributions in the s- and b-quark jets concentrating on the energy and transverse momentum distributions of these particles. The VOs emanating from the t Wb branch have displaced decay vertexes from the interaction point due to the weak decays b -> c -> s and the b-quark jets are rich in charged leptons. Hence, the absence of secondary vertexes and of the energetic charged leptons in the jet provide additional (b-jet vs. s-jet) discrimination in top quark decays. These distributions are used to train a boosted decision tree (BDT), a technique used successfully in measuring the CKM matrix element vertical bar V-tb vertical bar in single top production at the Tevatron. Using the BDT classifier, and a variant of it called BDTD, which makes use of decorrelated variables, we calculate the BDT(D)-response functions corresponding to the signal (t > Ws) and background (t Wb). Detailed simulations undertaken by us with the Monte Carlo generator PYTHIA are used to estimate the background rejection versus signal efficiency for three representative LHC energies root s = 7 TeV, 10 TeV and 14 TeV, of which only the analysis for the = 14 TeV case is shown in detail. We argue that a benchmark with 10% accuracy for the signal (t -> Ws) at a background (t Wb) rejection by a factor 103 (required due to the anticipated value of the ratio vertical bar V-ts vertical bar(2)/vertical bar V-tb vertical bar(2) similar or equal to 1.6 x 10(-3)) can be achieved at the LHC@14 TeV with an integrated luminosity of 10 fb(-1). (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：44 / 51

页数：8

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