Model-independent extraction of $|V_{tq}|$ matrix elements from top-quark measurements at hadron colliders

Abstract

Current methods to extract the quark-mixing matrix element $|V_{tb}|$ from single-top production measurements assume that $|V_{tb}|\gg |V_{td}|,|V_{ts}|$: top quarks decay into $b$ quarks with 100% branching fraction, s-channel single-top production is always accompanied by a $b$ quark and initial-state contributions from $d$ and $s$ quarks in the $t$-channel production of single top quarks are neglected. Triggered by a recent measurement of the ratio $R=\frac{|V_{tb}{|}^2}{|V_{td}{|}^2+|V_{ts}{|}^2+|V_{tb}{|}^2}=0.90\pm 0.04$ performed by the D0 collaboration, we consider a $|V_{tb}|$ extraction method that takes into account non zero d- and s-quark contributions both in production and decay. We propose a strategy that allows to extract consistently and in a model-independent way the quark mixing matrix elements $|V_{td}|$, $|V_{ts}|$, and $|V_{tb}|$ from the measurement of $R$ and from single-top measured event yields. As an illustration, we apply our method to the Tevatron data using a CDF analysis of the measured single-top event yield with two jets in the final state one of which is identified as a $b$-quark jet. We constrain the $|V_{tq}|$ matrix elements within a four-generation scenario by combining the results with those obtained from direct measurements in flavor physics and determine the preferred range for the top-quark decay width within different scenarios.

36 pages, 17 figures

References in corpus (21)

• Parton distributions for the LHC
• NNLL resummation for s-channel single top quark production
• Superallowed 0+ to 0+ nuclear beta decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model
• Parton Distributions for LHC
• Averages of b-hadron and c-hadron Properties at the End of 2007
• Anatomy of New Physics in B-Bbar mixing
• Next-to-leading-order predictions for t-channel single-top production at hadron colliders
• Predictions of selected flavour observables within the Standard Model
• Less space for a new family of fermions
• Observation of Single Top Quark Production and Measurement of |Vtb| with CDF
• An improved determination of the width of the top quark
• Inclusive search for same-sign dilepton signatures in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Search for heavy bottom-like quarks decaying to an electron or muon and jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Precision measurement of the ratio B(t -> Wb)/B(t -> Wq)
• Constraints on the Four-Generation Quark Mixing Matrix from a Fit to Flavor-Physics Data
• Search for pair-produced heavy quarks decaying to Wq in the two-lepton channel at sqrt(s) = 7 TeV with the ATLAS detector
• Measurements of single top quark production cross sections and |Vtb| in ppbar collisions at sqrt{s}=1.96 TeV
• Search for pair production of a heavy up-type quark decaying to a W boson and a b quark in the lepton+jets channel with the ATLAS detector
• Simultaneous measurement of the ratio B(t->Wb)/B(t->Wq) and the top quark pair production cross section with the D0 detector at sqrt(s)=1.96 TeV
• Using single top rapidity to measure V_td, V_ts, V_tb at hadron colliders
• Bounding CKM Mixing with a Fourth Family

Cited by in corpus (15)

• Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO
• Measurement of the inclusive cross-sections of single top-quark and top-antiquark $t$-channel production in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• The CKM Parameters
• Single top-quark production at the Tevatron and the LHC
• Single-top $t$-channel production with off-shell and non-resonant effects
• Single top quark production at the LHC
• Measurement of CKM matrix elements in single top quark $t$-channel production in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Precise predictions for single-top production: the impact of EW corrections and QCD shower on the t-channel signature
• Measuring $|V_{td}|$ at LHC
• Determination of the CKM matrix elements |V(xb)|
• Limits on the anomalous $Wtq$ couplings
• MINLO t-channel single-top plus jet
• Model-independent constraints on the CKM matrix elements $|V_{tb}|$, $|V_{ts}|$ and $|V_{td}|$
• Prospects of Direct Determination of |V_tq| CKM Matrix Elements at the LHC
• Probing $|V_{td}|$ in single-top production at $p{e}^{\mp }$ colliders