Measurement of the Lambda_b lifetime and mass in the ATLAS experiment
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Measurement of the Lambda_b lifetime and mass in the ATLAS experiment

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Measurement of the Lambda_b lifetime and mass in the ATLAS experiment

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ATLAS Collaboration; Cabrera Urbán, Susana Perfil; Castillo Giménez, María Victoria Perfil; Costa Mezquita, María José; Fassi, Farida; Ferrer Soria, Antonio Perfil; Fiorini, Luca; Fuster Verdú, Juan A. Perfil; García García, Carmen Perfil; García Navarro, José Enrique; González de la Hoz, Santiago Perfil; Hernández Jiménez, Yesenia; Higón Rodríguez, Emilio Perfil; Irles Quiles, Adrián; Kaci, Mohammed; Lacasta Llácer, Carlos; Lacuesta Miquel, Vicente; Martí García, Salvador; Miñano Moya, Mercedes; Mitsou, Vasiliki; Moles Valls, Regina; Moreno Llácer, María; Oliver García, Elena; Pedraza López, Sebastián; Pérez García-Estañ, María Teresa; Romero Adam, E.; Ros Martínez, Eduardo; Salt Cairols, José Perfil; Sánchez Martínez, Victoria; Solans Sánchez, Carlos Antonio; Soldevila, U.; Sánchez Martínez, Javier; Torró Pastor, Emma; Valero Biot, Alberto; Valladolid Gallego, E.; Valls Ferrer, Juan Antonio; Villaplana Pérez, Miguel; Vos, Marcel
Aquest document és un/a article, creat/da en: 2013
A measurement of the Lambda(0)(b) lifetime and mass in the decay channel Lambda(0)(b) -> J/psi (mu(+) mu(-))Lambda(0)(p pi(-)) is presented. The analysis uses a signal sample of about 2200 Lambda(0)(b) and (Lambda) over bar (0)(b) decays that are reconstructed in 4.9 fb(-1) of ATLAS pp collision data collected in 2011 at the LHC center-of-mass energy of 7 TeV. A simultaneous mass and decay time maximum likelihood fit is used to extract the Lambda(0)(b) lifetime and mass. They are measured to be tau(Lambda b) = 1.449 +/- 0.036(stat) +/- 0.017(syst) ps and m(Lambda b) = 5619.7 +/- 0.7(stat) +/- 1.1(syst) MeV.

    ATLAS Collaboration Cabrera Urbán, Susana Castillo Giménez, María Victoria Costa Mezquita, María José Fassi, Farida Ferrer Soria, Antonio Fiorini, Luca Fuster Verdú, Juan A. García García, Carmen García Navarro, José Enrique González de la Hoz, Santiago Hernández Jiménez, Yesenia Higón Rodríguez, Emilio Irles Quiles, Adrián Kaci, Mohammed Lacasta Llácer, Carlos Lacuesta Miquel, Vicente Martí García, Salvador Miñano, M. Mitsou, Vasiliki Moles Valls, Regina Moreno Llácer, María Oliver García, Elena Pedraza López, Sebastián Pérez García-Estañ, María Teresa Romero Adam, E. Ros Martínez, Eduardo Salt Cairols, José Sánchez Martínez, V. Solans Sánchez, Carlos Antonio Soldevila, U. Sánchez, J. Torró Pastor, Emma Valero, A. Valladolid Gallego, E. Valls Ferrer, Juan Antonio Villaplana Pérez, Miguel Vos, Marcel 2013 Measurement of the Lambda_b lifetime and mass in the ATLAS experiment Physical Review D 87 3 032002-1 032002-19
http://dx.doi.org/10.1103/PhysRevD.87.032002
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