A sample of 114±11 Bs0→J/ψK -π + signal events obtained with 0.37fb -1 of pp collisions at √s=7TeV collected by the LHCb experiment is used to measure the branching fraction ; polarization amplitudes of the Bs0→J/ψK ̄*0 decay, with K ̄ *0→K -π +. The K -π + mass spectrum of the candidates in the Bs0 peak is dominated by the K ̄*0 contribution. Subtracting the nonresonant K -π + component, the branching fraction of Bs0→J/ψK ̄*0 is (4.4-0.4+0.5±0.8)×10 -5, where the first uncertainty is statistical ; the second is systematic. A fit to the angular distribution of the decay products yields the K *0 polarization fractions f L=0.50±0.08±0.02 ; f=0.19-0.08+0.10±0.02. © 2012 CERN.

Measurement of the Bs0→J/ψK ̄*0 branching fraction ; angular amplitudes

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2012

Abstract

A sample of 114±11 Bs0→J/ψK -π + signal events obtained with 0.37fb -1 of pp collisions at √s=7TeV collected by the LHCb experiment is used to measure the branching fraction ; polarization amplitudes of the Bs0→J/ψK ̄*0 decay, with K ̄ *0→K -π +. The K -π + mass spectrum of the candidates in the Bs0 peak is dominated by the K ̄*0 contribution. Subtracting the nonresonant K -π + component, the branching fraction of Bs0→J/ψK ̄*0 is (4.4-0.4+0.5±0.8)×10 -5, where the first uncertainty is statistical ; the second is systematic. A fit to the angular distribution of the decay products yields the K *0 polarization fractions f L=0.50±0.08±0.02 ; f=0.19-0.08+0.10±0.02. © 2012 CERN.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/179798
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