Bottomonium spectrum at finite temperature

We investigate the modification of S and P wave states in the bottomonium spectrum above and below the deconfinement crossover temperature through their spectral functions obtained from the maximum entropy method. Anisotropic ensembles with \(N_f=2+1\) Wilson clover fermions with tadpole-improvement...

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Bibliographic Details
Published in:arXiv.org 2013-11
Main Authors: Harris, Tim, Ryan, Sinéad M, Aarts, Gert, Allton, Chris, Kim, Seyong, Lombardo, Maria Paola, Jon-Ivar Skullerud
Format: Article
Language:English
Subjects:
Crossovers
Fermions
Ground state
Maximum entropy method
P waves
S waves
Temperature
Online Access:Get full text
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Summary:We investigate the modification of S and P wave states in the bottomonium spectrum above and below the deconfinement crossover temperature through their spectral functions obtained from the maximum entropy method. Anisotropic ensembles with \(N_f=2+1\) Wilson clover fermions with tadpole-improvement are used while the bottom quark is treated with an improved non-relativistic action. We observe significant modifications of the P wave \(\chi_{b1}\) ground state directly above the crossover temperature, \(T_c\), while the S wave \(\Upsilon\) ground state remains relatively unchanged up to temperatures of almost \(2T_c\). This evidence supports earlier conclusions from our FASTSUM collaboration of the immediate dissociation of the P wave states above \(T_c\) and the survival of the S wave ground states up to \(2T_c\).
ISSN:2331-8422