Measuring $|V_{ts}|$ directly using strange-quark tagging at the LHC

Abstract

The Cabibbo-Kobayashi-Maskawa (CKM) element $V_{ts}$, representing the coupling between the top and strange quarks, is currently best determined through fits based on the unitarity of the CKM matrix, and measured indirectly through box-diagram oscillations, and loop-mediated rare decays of the $B$ or $K$ mesons. It has been previously proposed to use the tree level decay of the $t$ quark to the $s$ quark to determine $|V_{ts}|$ at the LHC, which has become a top factory. In this paper, we extend the proposal by performing a detailed analysis of measuring $t\to sW$ in dileptonic $t\bar{t}$ events. In particular, we perform detector response simulation, including the reconstruction of $K_S$, which are used for tagging jets produced by $s$ quarks against the dominant $t\to bW$ decay. We show that it should be possible to exclude $|V_{ts}|=0$ at 6.0$\sigma$ with the expected High Luminosity LHC luminosity of 3000 fb${}^{-1}$.

arXiv comment6 pages, 5 figures

References in corpus (23)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• TMVA - Toolkit for Multivariate Data Analysis
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Merging meets matching in MC@NLO
• FLAG Review 2019
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• The RooFit toolkit for data modeling
• Precision measurement of the $B_s^0$-${\bar{B}}_s^0$ oscillation frequency with the decay $B^{0}_{s}\rightarrowD^{-}_{s}π^{+}$
• Measurements of $\mathrm{t}\overline{\mathrm{t}}$ differential cross sections in proton-proton collisions at $\sqrt{s}=$ 13 TeV using events containing two leptons
• Measurement of normalized differential $\mathrm{t}\overline{\mathrm{t}}$ cross sections in the dilepton channel from pp collisions at $\sqrt{s}=$ 13 TeV
• Measurement of CKM matrix elements in single top quark $t$-channel production in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measurement of double-parton scattering in inclusive production of four jets with low transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Prospects of measuring the CKM matrix element $|V_{ts}|$ at the LHC
• $|V_{cb}|$ and $\gamma$ from $B$-mixing -- Addendum to "$B_s$ mixing observables and $|V_{td}/V_{ts}|$ from sum rules"
• Model-independent constraints on the CKM matrix elements $|V_{tb}|$, $|V_{ts}|$ and $|V_{td}|$

Cited by in corpus (2)

• Improving the Direct Determination of $|V_{ts}|$ using Deep Learning
• Probing $|V_{td}|$ in single-top production at $p{e}^{\mp }$ colliders