Open bottom states and the B¯-meson propagation in hadronic matter

Juan M. Torres-Rincon, Laura Tolos, and Olena Romanets
Phys. Rev. D 89, 074042 – Published 22 April 2014

Abstract

The interaction and propagation of B¯ mesons with light mesons, N and Δ, is studied within a unitarized approach based on effective models that are compatible with chiral and heavy-quark symmetries. We find several heavy-quark spin doublets in the open bottom sectors, where B¯ and B¯* mesons are present. In the meson sector we find several resonant states, among them a B0 and a B1 with masses 5530 MeV and 5579 MeV as well as Bs0* and Bs1* narrow states at 5748 MeV and 5799 MeV, respectively. They form two doublets with no experimental identification yet, the first one being the bottom counterpart of the D0(2400) and D1(2430) states, and the second bottom doublet associated to the ubiquitous Ds0*(2317) and the Ds1(2460). In the baryon sector, several Λb and Σb doublets are identified, among them the one given by the experimental Λb(5910) and Λb*(5921). Moreover, one of our states, the Σb*(5904), turns out to be the bottom counterpart of the experimental Σ*(1670) and predicted Σc*(2550), which is a case for discovery. We finally analyze different transport coefficients for the B¯ meson in hot matter, such as those formed in heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC). For RHIC/LHC energies, the main contribution to the coefficients comes from the interaction of B¯ mesons with pions. However, we also include the effects of baryonic density which might be sizable at temperatures T100MeV, as the chemical potential is expected to increase in the last stages of the expansion. We conclude that although the relaxation time decreases with larger baryonic densities, the B¯ meson does not thermalize at RHIC/LHC energies, representing an ideal probe for the initial bottom distribution.

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  • Received 11 March 2014

DOI:https://doi.org/10.1103/PhysRevD.89.074042

© 2014 American Physical Society

Authors & Affiliations

Juan M. Torres-Rincon

  • Institut de Ciències de l’Espai (IEEC/CSIC), Campus Universitat Autònoma de Barcelona, Facultat de Ciències, Torre C5, E-08193 Bellaterra, Spain and Subatech, UMR 6457, IN2P3/CNRS, Université de Nantes, École de Mines de Nantes, 4 rue Alfred Kastler 44307, Nantes, France

Laura Tolos

  • Institut de Ciències de l’Espai (IEEC/CSIC), Campus Universitat Autònoma de Barcelona, Facultat de Ciències, Torre C5, E-08193 Bellaterra, Spain and Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe University, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany

Olena Romanets

  • KVI, University of Groningen, Zernikelaan 25, 9747AA Groningen, The Netherlands

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Issue

Vol. 89, Iss. 7 — 1 April 2014

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