Abstract

We report a measurement of the cross section of single top-quark production in the t-channel using 1.04 fb−1 of pp collision data at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC. Selected events feature one electron or muon, missing transverse momentum, and two or three jets, exactly one of them identified as originating from a b quark. The cross section is measured by fitting the distribution of a multivariate discriminant constructed with a neural network, yielding σt = 83±4 (stat.)+20−19 (syst.) pb, which is in good agreement with the prediction of the Standard Model. Using the ratio of the measured to the theoretically predicted cross section and assuming that the top-quark-related CKM matrix elements obey the relation |Vtb|>>|Vts|, |Vtd|, the coupling strength at the W-t-b vertex is determined to be |Vtb| = 1.13+0.14−0.13. If it is assumed that |Vtb| <= 1 a lower limit of |Vtb| > 0.75 is obtained at the 95% confidence level.

Autore Pugliese

• Spagnolo Stefania Antonia , Gorini Edoardo , Ventura Andrea

Tutti gli autori

• G. AAD , M. BIANCO , G. CHIODINI , E. GORINI , M. PRIMAVERA , S. SPAGNOLO , A. VENTURA , ET AL.

Titolo volume/Rivista

PHYSICS LETTERS. SECTION B

Anno di pubblicazione

2012

ISSN

0370-2693

ISBN

Non Disponibile

Numero di citazioni Wos

93

Ultimo Aggiornamento Citazioni

25/04/2018

Numero di citazioni Scopus

214

Ultimo Aggiornamento Citazioni

24/04/2018

Settori ERC

Non Disponibile

Codici ASJC

Non Disponibile