Bottomonium spectroscopy in the quark–gluon plasma

UPSILON SPECTROSCOPY: Transitions in the Bottomonium System

Bottomonium dissociation in a finite density plasma

Nelson R. F. Braga∗ and Luiz F. Ferreira† Instituto de F́ısica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, RJ 21941-972 – Brazil Abstract We present a holographic description of the thermal behavior of bb̄ heavy vector mesons inside a plasma at finite temperature and density. The meson dissociation in the medium is represented by the decrease in the height of the spectral functio...

Prospects of Probing New Physics in Bottomonium Decays and Spectroscopy *

A non-standard light CP-odd Higgs boson could induce a slight (but observable) lepton universality breaking in Upsilon leptonic decays. Moreover, mixing between such a pseu-doscalar Higgs boson and η b states might shift their mass levels, thereby modifying the values of the M Υ(nS) − M η b (nS) hyperfine splittings predicted in the standard model. Besides, η b resonances could be broader than ...

Belle II early physics program of bottomonium spectroscopy

The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK "B factory" facility in Tsukuba, Japan. Phase 1 commissioning of the main ring of SuperKEKB has started in February 2016 and first physics data will be recorded in 2017 during the so-called Phase 2 commissioning, when the partial Belle II detector will be operated still without its vertex detector. In 2018, the full...

On viscous flow and azimuthal anisotropy of the quarkgluon plasma in a strong magnetic field

We calculate the viscous pressure tensor of the quarkgluon plasma in a strong magnetic field. It is azimuthally anisotropic and is characterized by five shear viscosity coefficients, four of which vanish when the field strength eB is much larger than the plasma temperature squared. We argue that the azimuthally anisotropic viscous pressure tensor generates the asymmetric transverse flow. As an ...