Open and Hidden Charm Production in 920 GeV Proton-Nucleus Collisions
نویسندگان
چکیده
منابع مشابه
Measurement of the Υ production cross section in 920 GeV fixed-target proton–nucleus collisions
The cross section ratio RJ/ψ = Br(Υ → l+l−) · dσ(Υ )/dy|y=0/σ(J/ψ) has been measured with the HERA-B spectrometer in fixed-target proton–nucleus collisions at 920 GeV proton beam energy corresponding to a proton–nucleon c.m.s. energy of √ s = 41.6 GeV. The combined results for the decay channels Υ → e+e− and Υ → μ+μ− yield a ratio RJ/ψ = (9.0 ± 2.1)× 10−6. The corresponding Υ production cross s...
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A measurement of the polarization of Λ and Λ̄ baryons produced in pC and pW collisions at √ s = 41.6 GeV has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV/c < p⊥ < 1.2 GeV/c in transverse momentum and −0.15 < xF < 0.01 in Feynman-x. The polarization results from the two different targets agree within the statistical error. In the combined data...
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We discuss production of charmed mesons and J/Ψ in p(d)A collisions at high energies. We argue that when the saturation scale Qs characterizing the parton density in a nucleus exceeds the quark mass m the naive perturbation theory breaks down. Consequently, we calculate a process of heavy quark production in both open and hidden channels in the framework of the parton saturation model (Color Gl...
متن کاملAngular distributions of leptons from J/ψ’s produced in 920 GeV fixed-target proton-nucleus collisions
A study of the angular distributions of leptons from decays of J/ψ’s produced in p-C and p-W collisions at √ s = 41.6 GeV has been performed in the J/ψ Feynman-x region −0.34 < xF < 0.14 and for J/ψ transverse momenta up to 5.4 GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a clean selection of 2.3 · 10 J/ψ’s reconst...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2005
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2005.01.018