Inclusive π0 production at the CERN p-p̄ collider
ABSTRACT Inclusive π0 production has been measured at the CERN pp̄ collider, , for 90° production angle and in a range of transverse momenta between 1.5 and 4.5 GeV/c. The invariant production cross section is larger than that measured at for p-p collisions. The production of μ mesons aand of direct photons is also investigated.
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ABSTRACT: We present the transverse momentum (pT) spectra for identified charged pions, protons and anti-protons from p+p and d+Au collisions at . The spectra are measured around midrapidity (|y|<0.5) over the range of 0.3<pT<10 GeV/c with particle identification from the ionization energy loss and its relativistic rise in the time projection chamber and time-of-flight in STAR. The charged pion and proton + anti-proton spectra at high pT in p+p and d+Au collisions are in good agreement with a phenomenological model (EPOS) and with next-to-leading order perturbative quantum chromodynamic (NLO pQCD) calculations with a specific fragmentation scheme and factorization scale. We found that all proton, anti-proton and charged pion spectra in p+p collisions follow xT-scaling for the momentum range where particle production is dominated by hard processes (pT≳2 GeV/c). The nuclear modification factor around midrapidity is found to be greater than unity for charged pions and to be even larger for protons at 2<pT<5 GeV/c.Physics Letters B 06/2006; 637(3-637):161-169. DOI:10.1016/j.physletb.2006.04.032 · 6.02 Impact Factor
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ABSTRACT: The distribution of total tranverse energy ΣET over the pseudorapidity interval −1 < η < 1 and an azimuthal range Δφ=300° has been measured in the UA2 experiment at the CERN p collider () using a highly segmented total absorption caloriter. In the events with very large most of the transverse energy is found to be contained in small angular regions as expected for high transverse momentum hadron jets. We discuss the properties of a sample of two-jet events with invariant two-jet masses up to and we measure the cross section for inclusive jet production in the range of jet transverse momenta between .Physics Letters B 12/1982; 118(1-3-118):203-210. DOI:10.1016/0370-2693(82)90629-3 · 6.02 Impact Factor