3,008 research outputs found
Quark recombination model for polarizations in inclusive hyperon productions at high energy
We investigate the transverse polarization of hyperons produced by the photon
induced reactions using the quark recombination model. This model reproduces
polarizations of hadrons produced by the hadron-hadron collisions and accounts
for the origin of the empirical rule by DeGrand and Miettinen. We find
significant polarizations in the hyperon photoproduction by applying this model
to the \gamma N \ra \Lam reaction.Comment: Latex, 6 page with 6 figures, to be published in proceedings of APCTP
Workshop on "Strangeness Nuclear Physics", Feb. 19-22, Seoul, Kore
Charmonium ground and excited states at finite temperature from complex Borel sum rules
Charmonium spectral functions in vector and pseudoscalar channels at finite
temperature are investigated through the complex Borel sum rules and the
maximum entropy method. Our approach enables us to extract the peaks
corresponding to the excited charmonia, and , as
well as those of the ground states, and , which has never been
achieved in usual QCD sum rule analyses. We show the spectral functions in
vacuum and their thermal modification around the critical temperature, which
leads to the almost simultaneous melting (or peak disappearance) of the ground
and excited states.Comment: 6 pages, 4 figures; published versio
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