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Article overview
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Gluodissociation and Screening of Upsilon States in PbPb Collisions at sqrt (s_NN) = 2.76 TeV | Felix Brezinski
; Georg Wolschin
; | Date: |
1 Sep 2011 | Abstract: | We suggest that gluon-induced dissociation and screening of the Y(nS) states
explain the suppression of the Y(2S+3S) states relative to the Y(1S) ground
state that has been observed by CMS in PbPb collisions at sqrt(s_NN)= 2.76 TeV
at the CERN LHC. The minimum-bias gluodissociation cross sections of the 1S-3S
states are calculated using a screened Cornell potential and a thermal gluon
distribution. The 3S state dissolves due to screening before sizeable
gluodissociation occurs, but for the 2S and 1S states there is an interplay
between screening, gluodissociation, and feed-down from the chi_b(2P) and
chi_b(1P) states. The calculated suppression of the Y(2S) and Y(3S) states
relative to Y(1S) is consistent with the CMS result, but allows for additional
suppression mechanisms. The Y(1S) suppression through gluodissociation is in
excellent agreement with the CMS data. | Source: | arXiv, 1109.0211 | Services: | Forum | Review | PDF | Favorites |
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