Double-spin asymmetry ofJ/ψproduction in polarizedppcollisions
نویسندگان
چکیده
منابع مشابه
Double-spin cosφ asymmetry in semi-inclusive electroproduction
We consider the double-spin cosφ asymmetry for pion electroproduction in semi-inclusive deep inelastic scattering of longitudinally polarized leptons off longitudinally polarized protons. We estimate the size of the asymmetry in the approximation where all twist-3 interaction-dependent distribution and fragmentation functions are set to zero. In that approximation at HERMES kinematics a sizable...
متن کاملMC-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...
متن کاملSpin and Isospin Asymmetry, Equation of State and Neutron Stars
In the present work, we have obtained the equation of state for neutron star matter considering the in uence of the ferromagnetic and antiferromagnetic spin state. We have also investigated the structure of neutron stars. According to our results, the spin asymmetry stiens the equation of state and leads to high mass for the neutron star.
متن کاملFirst Measurement of the Double Spin Asymmetry in e p ! e0p1n in the Resonance Region
R. De Vita,1 M. Anghinolfi,1 V. D. Burkert,2 G. E. Dodge,3 R. Minehart,4 M. Taiuti,1 H. Weller,5 G. Adams,31 M. J. Amaryan,38 E. Anciant,11 D. S. Armstrong,37 B. Asavapibhop,25 G. Asryan,38 G. Audit,11 T. Auger,11 H. Avakian,19 H. Bagdasaryan,38 J. P. Ball,7 S. Barrow,16 M. Battaglieri,1 K. Beard,22 M. Bektasoglu,3 N. Bianchi,19 A. S. Biselli,31 S. Boiarinov,21 B. E. Bonner,32 P. Bosted,25 S. B...
متن کاملDouble-spin asymmetry in the cross section for exclusive ρ0 production in lepton–proton scattering
Evidence for a positive longitudinal double-spin asymmetry 〈Aρ1 〉 = 0.24 ± 0.11stat ± 0.02syst in the cross section for exclusive diffractive ρ0(770) vector–meson production in polarised lepton–proton scattering was observed by the HERMES experiment. The longitudinally polarised 27.56 GeV HERA positron beam was scattered off a longitudinally polarised pure hydrogen gas target. The average invar...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 1997
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.56.7331