Two structures are observed close to the kinematic threshold in the Ξb0 π− mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb^−1, recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity JP=(1/2)+ and JP=(3/2)+ states, denoted Ξb′− and Ξb*−. Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(Ξb′−) − m(Ξb0) − m(π−) = 3.653 ± 0.018 ± 0.006 MeV/c2, m(Ξb*−) − m(Ξb0) − m(π−) = 23.96 ± 0.12 ± 0.06 MeV/c2, Γ(Ξb*−) = 1.65 ± 0.31 ± 0.10 MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Γ(Ξb′−) < 0.08 MeV at 95% confidence level. Relative production rates of these states are also reported.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2015). Observation of Two New Ξb− Baryon Resonances. PHYSICAL REVIEW LETTERS, 114(6), 1-9 [10.1103/PhysRevLett.114.062004].

Observation of Two New Ξb− Baryon Resonances

L. Capriotti;CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2015

Abstract

Two structures are observed close to the kinematic threshold in the Ξb0 π− mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb^−1, recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity JP=(1/2)+ and JP=(3/2)+ states, denoted Ξb′− and Ξb*−. Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(Ξb′−) − m(Ξb0) − m(π−) = 3.653 ± 0.018 ± 0.006 MeV/c2, m(Ξb*−) − m(Ξb0) − m(π−) = 23.96 ± 0.12 ± 0.06 MeV/c2, Γ(Ξb*−) = 1.65 ± 0.31 ± 0.10 MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Γ(Ξb′−) < 0.08 MeV at 95% confidence level. Relative production rates of these states are also reported.
2015
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, et al. (2015). Observation of Two New Ξb− Baryon Resonances. PHYSICAL REVIEW LETTERS, 114(6), 1-9 [10.1103/PhysRevLett.114.062004].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/425173
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