Υ cross section in p + p collisions at s = 200 GeV Balewski, J.; Bellwied, R.; Betancourt, M. J. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
7/2010, Letnik:
82, Številka:
1
Journal Article
Transverse energy (E{sub T}) distributions have been measured for Au+Au collisions at {radical}s{sub NN} = 200 GeV by the STAR collaboration at RHIC. E{sub T} is constructed from its hadronic and ...electromagnetic components, which have been measured separately. E{sub T} production for the most central collisions is well described by several theoretical models whose common feature is large energy density achieved early in the fireball evolution. The magnitude and centrality dependence of E{sub T} per charged particle agrees well with measurements at lower collision energy, indicating that the growth in E{sub T} for larger collision energy results from the growth in particle production. The electromagnetic fraction of the total E{sub T} is consistent with a final state dominated by mesons and independent of centrality.
Single-spin asymmetries $A_N$ in reactions p+p(pol)->\pi^0 + X and
\pi^-+p(pol)->\pi^0 + X at 50 and 40 GeV/c respectively behave in drastically
different ways in function of transverse momentum in ...the central region. At the
same time $A_N$ in the polarized proton fragmentation region of these reactions
are practically coinciding. Our new data on the analyzing power at 50 GeV/c in
the polarized proton fragmentation region in reaction p+p(pol)->\pi^0 + X
confirm this conclusion with better statistics and coincide with our previous
data at 70 GeV/c for the same reaction.
Nucl.Instrum.Meth.A582:575-580,2007 The electromagnetic calorimeter of PANDA at the FAIR facility will rely on an
operation of lead tungstate (PWO) scintillation crystals at temperatures near
-25 ...deg.C to provide sufficient resolution for photons in the energy range from
8 GeV down to 10 MeV. Radiation hardness of PWO crystals was studied at the
IHEP (Protvino) irradiation facility in the temperature range from room
temperature down to -25 deg.C. These studies have indicated a significantly
different behaviour in the time evolution of the damaging processes well below
room temperature. Different signal loss levels at the same dose rate, but at
different temperatures were observed. The effect of a deep suppression of the
crystal recovery process at temperatures below
0 deg.C has been seen.
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