123624321
J/ψ PRODUCTION IN A GLAUBER MONTE CARLO FRAMEWORK
By means of a Glauber Monte Carlo framework, the J/ψ production at RHIC energies is studied with the EKS98, EPS09 and HKN07 shadowing parameters. With a χ2 analysis of the experimental data given by PHENIX, a significant dependence of the absorption cross-section, σabs, on the J/ψ-nucleon center-of-mass energy, , is revealed with the HKN07 shadowing, but an unconspicuous dependence is shown with the EKS98 and EPS09 shadowing. In this paper, the nuclear modification factor Rd Au vs y, pT and Ncoll are also calculated and the theoretical results are in good agreement with the experimental data.
120643390
D-meson production in an AdS/CFT inspired model at the LHeC
By means of an AdS/CFT inspired model given by Kovchegov Lu and Rezaeian, the D-meson production in e + p (A) collisions at Large Hadron-electron Collider (LHeC) energies is investigated in the color-dipole formalism. The theoretical results indicate that the x-independence phenomena at very small x and Q2, which are predicted by the AdS/CFT inspired model, can be tested by the charmed quark meson production in e + p scattering at LHeC energies. Comparing with the results of the models motivated by pQCD, we also find that the theoretical results predicted by the AdS/CFT inspired model are much larger than those of the GBW and b-CGC models but smaller than that of the KT model at LHeC energies.
120404554
J/ψ-N center of mass energy dependence of nuclear absorption effect on J/ψ production
In this paper, the J/psi nuclear absorption effect is studied at RHIC and LHC energies with the EKS98 shadowing parameterizations. By assuming that the J/psi absorption cross section, sigma(abs), increases with the charmonium-nucleon (J/psi-N) center of mass energy, root(s)J/psi N, it is found that sigma(abs) should depend on x(F) (or y) at a certain center of mass energy per nucleon pair, root s especially at LHC energies. The theoretical results with the x(F) (or y)-dependence of the absorption effect are in good agreement with the experiment data from PHENIX in d-Au collisions and the predicted results will be examined by the forthcoming experimental data from LHC in d-Pb collisions. Finally, we also present baseline calculations of cold nuclear matter effects on J/psi production in nucleus-nucleus (A-A) collisions and find that the x(F) (or y)-dependence of absorption effect is very small at both RHIC and LHC energies in A-A collisions.
122606637
High-energy Drell-Yan dimuon process in a Glauber model
In the framework of the Glauber model, taking into account the K'-factor, we analyse the Drell-Yan dimuon production cross sections for an absolute measurement of continuum dimuon (Drell-Yan) cross section in 800 GeV/c pp collisions. The calculated results of the leading order agree only poorly with the new experimental data, but there is a general agreement between the next-to-leading-order QCD correction results and the experimental data. It is shown that the QCD corrections to the Drell-Yan process cannot be omitted. Then, by means of the nuclear parton distribution obtained from the DGLAP equation, taking into account the energy loss of the beam proton through the nucleus, we analyse the QCD corrections to the measured Drell-Yan production cross sections for an 800 GeV proton beam incident on Be, Fe and W nuclear targets in the Glauber model. It is shown that the theoretical results are in good agreement with the FNAL E866. Finally, we compare the calculated results from the DGLAP equation with those from the latest nuclear effect models.
118934485
Charm structure functions and gluon shadowing effects with the AdS/CFT model
By means of the UGD function extracted from an AdS/CFT inspired saturation model, the charm and bottom structure functions are studied in fixed-order perturbation theory. It is shown that the theoretical results are in good agreement with the recent HERA data. Then, this UGD function is also used to investigate net-kaon rapidity distribution in Au+Au collisions at RHIC energies and the theoretical results fit well to the BRAHMS data. In the end of this paper, we give the predicted results for nuclear charm structure function at very small x where the popular shadowing parameterizations are invalid.
40767145
Rotating Coil Magnetic Measurement System and Measurement Results of Quadrupole Prototype for BEPCII Storage Ring
A normal quadrupole prototype magnet with 266-mm long, 105-mm aperture has been designed and fabricated by IHEP. Total of 88 quadrupole magnets are under fabrication. The multipole components, magnetic field gradient and transfer function of the quadrupole magnets were measured in September 2004, using an updated measurement system, which includes a rotating coil measurement system and a Hall Probe measurement system. This paper mainly describes the updated harmonic coil magnetic field measurement system and provides the measurement results for BEPC II quadrupole magnets
118983836
Quantum subgroups and quantum co-set spaces and differential calculi on them
121347479
De Rham complexes of q‐analog of general linear group GLq(N)
In this paper, a set of De Rham complexes of quantum group GLq(N) determined by one parameter r is given, and it is proven that the differential calculi on the quantum group GLq(N) given in this paper are bicovariant. The noncommutative differential calculi on the quantum groups SLq(N) and SUq(N) are also discussed.
121870295
Yang-Baxter matrix and *-calculi on quantum groups of A-series
The authors prove that the differential calculi on quantum groups of A-series given in this letter and in previous papers are *-calculi.
115613624
Six vertex type solutions of Yang-Baxter equation with color parameters