MC-Simulation of the Transverse Double Spin Asymmetry for RHIC
نویسندگان
چکیده
منابع مشابه
MC-Simulation of the Transverse Double Spin Asymmetry for RHIC∗
Using Sphinx tt, a new MC simulation program for transverse polarized nucleon–nucleon scattering based on Pythia 5.6, we calculate the transverse double spin asymmetry ATT in the Drell-Yan process. If one assumes (quite arbitrarily) that the transversity parton distribution δq(x,Q2) equals the helicity distribution ∆q(x,Q2) at some low Q0 scale, the resulting asymmetry is of order 1%. In this c...
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The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory is the first accelerator facility that can accelerate, store and collide spin polarized proton beams. This development enables a physics program aimed at understanding how the spin of the proton results from its quark and gluon substructures. Spin states that are either parallel (longitudinal) or perpendicular (transve...
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STAR has observed sizable transverse single-spin asymmetries for inclusive π production at forward rapidity in p+p collisions at √ s = 200 GeV. These asymmetries may arise from either the Sivers or Collins effect. Studies are underway during the current RHIC run to elucidate the dynamics that underlie these single-spin asymmetries. Additional measurements are underway to search for the Sivers e...
متن کاملDouble transverse spin asymmetry in the pp̄ Drell-Yan process from Sivers functions
We show that the transverse double spin asymmetry (DSA) in the Drell-Yan process contributed only from the Sivers functions can be picked out by the weighting function QT M (cos(φ−φS1) cos(φ− φS2) + 3 sin(φ − φS1) sin(φ − φS2)). The asymmetry is proportional to the product of two Sivers functions from each hadron f ⊥(1) 1T × f ⊥(1) 1T . Using two sets of Sivers functions extracted from the semi...
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Hadroproductions of charmonium and bottomonium χJ in polarized pp collisions at RHIC energies are studied. Two–spin asymmetries AJ LL(pp) for these reactions are very good parameters for examining the polarized gluon distributions in a proton.
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ژورنال
عنوان ژورنال: Zeitschrift für Physik A Hadrons and Nuclei
سال: 1997
ISSN: 0939-7922,1431-5831
DOI: 10.1007/s002180050351