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 View the MathML source 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 View the MathML source, 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 View the MathML source. If it is assumed that |Vtb|⩽1 a lower limit of |Vtb|>0.75 is obtained at the 95% confidence level.
Measurement of the t-channel single top-quark production cross section in pp collisions at √s=7 TeV with the ATLAS detector / Aad, G; Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; Cevenini, F.; Chiefari, Giovanni; DELLA VOLPE, Domenico; Merola, Leonardo; Sergio, Patricelli; Conventi, F.; DELLA PIETRA, Massimo; Giordano, Raffaele; Musto, E.; Rossi, E.; Sanchez, A.; Carlino, G.; de Asmundis, R.; Doria, A.; Izzo, V.; Sekhniaidze, G.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 717:(2012), pp. 330-350. [10.1016/j.physletb.2012.09.031]
Measurement of the t-channel single top-quark production cross section in pp collisions at √s=7 TeV with the ATLAS detector
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi E.;
2012
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 View the MathML source 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 View the MathML source, 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 View the MathML source. If it is assumed that |Vtb|⩽1 a lower limit of |Vtb|>0.75 is obtained at the 95% confidence level.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.