A sample of 114±11 B0s → J/ψ K− π+ signal events obtained with 0.37 fb^−1 of pp collisions at √s = 7 TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the B0s → J/ψ anti-K*0 decay, with anti-K*0 → K− π+. The K− π+ mass spectrum of the candidates in the B0s peak is dominated by the anti-K*0 contribution. Subtracting the nonresonant K− π+ component, the branching fraction of B0s → J/ψ anti-K*0 is (4.4 (−0.4)(+0.5) ± 0.8) x 10^−5, where the first uncertainty is statistical and the second is systematic. A fit to the angular distribution of the decay products yields the K*0 polarization fractions fL = 0.50 ± 0.08 ± 0.02 and f∥ = 0.19 (−0.08)(+0.10) ± 0.02.

R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, et al. (2012). Measurement of the B0s → J/ψ anti-K*0 Branching Fraction and Angular Amplitudes. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(7), 1-9 [10.1103/PhysRevD.86.071102].

Measurement of the B0s → J/ψ anti-K*0 Branching Fraction and Angular Amplitudes

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2012

Abstract

A sample of 114±11 B0s → J/ψ K− π+ signal events obtained with 0.37 fb^−1 of pp collisions at √s = 7 TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the B0s → J/ψ anti-K*0 decay, with anti-K*0 → K− π+. The K− π+ mass spectrum of the candidates in the B0s peak is dominated by the anti-K*0 contribution. Subtracting the nonresonant K− π+ component, the branching fraction of B0s → J/ψ anti-K*0 is (4.4 (−0.4)(+0.5) ± 0.8) x 10^−5, where the first uncertainty is statistical and the second is systematic. A fit to the angular distribution of the decay products yields the K*0 polarization fractions fL = 0.50 ± 0.08 ± 0.02 and f∥ = 0.19 (−0.08)(+0.10) ± 0.02.
2012
R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, et al. (2012). Measurement of the B0s → J/ψ anti-K*0 Branching Fraction and Angular Amplitudes. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(7), 1-9 [10.1103/PhysRevD.86.071102].
R. Aaij; C. Abellan Beteta; A. Adametz; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/127556
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