621 research outputs found
Introduction to the Physics of Saturation
We present a brief introduction to the physics of parton saturation/Color
Glass Condensate (CGC).Comment: 10 pages, 5 figures, based on the talk given at the RIKEN BNL
Research Center Workshop on "Saturation, the Color Glass Condensate and
Glasma: What Have we Learned from RHIC?" on May 10, 201
Diffractive dissociation including pomeron loops in zero transverse dimensions
We have recently studied the QCD pomeron loop evolution equations in zero
transverse dimensions [Shoshi:2005pf]. Using the techniques developed in
[Shoshi:2005pf] together with the AGK cutting rules, we present a calculation
of single, double and central diffractive cross sections (for large diffractive
masses and large rapidity gaps) in zero transverse dimensions in which all
dominant pomeron loop graphs are consistently summed. We find that the
diffractive cross sections unitarise at asymptotic energies and that they are
suppressed by powers of alpha_s. Our calculation is expected to expose some of
the diffractive physics in hadron-hadron collisions at high energy.Comment: 14 pages, 5 figures; numerous explanations added, matches the
published versio
Color Glass Condensate and BFKL dynamics in deep inelastic scattering at small x
The proton structure function F_2(x,Q^2) for x < 0.01 and 0.045< Q^2 < 45
GeV^2, measured in the deep inelastic scattering at HERA, can be well described
within the framework of the Color Glass Condensate.Comment: 4 pages, 1 figure, incl. IOP style files. Talk given at the 17th
International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions
(Quark Matter 2004), Oakland, CA USA, 11-17 Jan 200
Kluang cooperation loan application
Currently, Kluang Cooperation Society still has manual system using log book to manage and apply loan. Kluang Cooperative Society does not have any system to manage and record all data that related and to apply the loan. In manually, all the information about members and activities is on the log book or paper sheet. The
applicant also must fill up the loan form using handwriting. This situation makes the staff of Kluang Cooperation difficult to find the information in the file at the rack in shortest time. So, the new system will develop due to this situation that performs the online function for registration as member, apply the three types of loans; personal loan, emergency loan and road tax loan, check loan's status, view loan record and print
agreement meanwhile the admin can approve or reject loan status, search member and loan detail and generate loan. Kluang Cooperation Loan Application (KCLA) help and
make easier to all member of Kluang Cooperation in the management of applying loan and also very suitable for the member of this cooperation to apply the loan in
everywhere via online application
The BFKL Pomeron Calculus in zero transverse dimensions: diffractive processes and survival probability for central diffractive production
In this paper we discuss the processes of diffractive production in the
framework of the BFKL Pomeron calculus in zero transverse dimension.
Considering the diffractive production of a bunch of particles with not very
large masses, namely,
\ln\Lb M^2/m^2 \Rb \ll \frac{1}{\bas} \ln\Lb \frac{N^2_c}{\bas^2}\Rb, we
found explicit formulae for calculation of the cross sections for the single
and double diffractive production as well as for the value of the survival
probability for the diffractive central production. These formulae include the
influence of the correlations due to so called Pomeron loops on the values of
all discussed observables. The comparison with the other approaches on the
market is given. The main conclusion of this comparison: the
Mueller-Patel-Salam-Iancu approximation gives sufficiently good descriptions
and close to the exact result for elastic and diffractive cross section but
considerable overshoot the value of the survival probability.Comment: 25 page
Elliptic flow in nuclear collisions at the Large Hadron Collider
We use perfect-fluid hydrodynamical model to predict the elliptic flow
coefficients in Pb + Pb collisions at the Large Hadron Collider (LHC). The
initial state for the hydrodynamical calculation for central collisions
is obtained from the perturbative QCD + saturation (EKRT) model. The centrality
dependence of the initial state is modeled by the optical Glauber model. We
show that the baseline results obtained from the framework are in good
agreement with the data from the Relativistic Heavy Ion Collider (RHIC), and
show predictions for the spectra and elliptic flow of pions in Pb + Pb
collisions at the LHC. Also mass and multiplicity effects are discussed.Comment: 11 pages, 10 figure
Survival probability in diffractive Higgs production in high density QCD
In this paper, the contribution of hard processes described by the BFKL
pomeron exchange, is taken into account by calculating the first enhanced
diagram. The survival probability is estimated, using the ratio of the first
enhanced diagram and the single pomeron amplitude, taking into account all
essential pomeron loop diagrams in the toy model of Mueller. The triple pomeron
vertex is calculated explicitly in the momentum representation. This
calculation is used for estimating the survival probability, It turns out that
the survival probability is small, at . Hard pomeron re-scattering
processes contribute substantially to the survival probability.Comment: 28 pages, 7 figure
About possible contribution of intrinsic charm component to inclusive spectra of charmed mesons
We calculate differential energy spectra (-distributions) of charmed
particles produced in proton-nucleus collisions, assuming the existence of
intrinsic heavy quark components in the proton wave function. For the
calculation, the recently proposed factorization scheme is used, based on the
Color Glass Condensate theory and specially suited for predictions of a
production of particles with large rapidities. It is argued that the intrinsic
charm component can, if it exists, dominate in a sum of two components,
intrinsic + extrinsic, of the inclusive spectrum of charmed particles produced
in proton-nucleus collisions at high energies, in the region of medium ,
, and can give noticeable contribution to atmospheric fluxes
of prompt muons and neutrinos.Comment: 10 pages, 4 figures. Version published in J. Phys. G
Inclusive Gluon Production In High Energy Onium-Onium Scattering
We calculate the inclusive single-gluon production cross section in high
energy onium-onium scattering including pomeron loop effects. The resulting
inclusive cross section is given by the k_T-factorization formula with one of
the unintegrated gluon distribution functions depending on the total
onium-onium scattering cross section, which includes all pomeron loops and has
to be found independently. We discuss the limits of applicability of our result
and argue that they are given by the limits of applicability of pomeron loop
resummation approach. Since the obtained k_T-factorization formula is infrared
divergent we conclude that, in order to consistently calculate the
(infrared-finite) gluon production cross section in onium-onium scattering, one
has to include corrections going beyond the pomeron loop approximation.Comment: 20 pages, 6 figures; v2: version accepted to Phys. Rev. D, minor
corrections include
Nuclear Modification Factor in d+Au Collisions: Onset of Suppression in the Color Glass Condensate
We perform a quantitative analysis of the nuclear modification factor in
deuteron--gold collisions R(dAu) within the Color Glass Condensate approach,
and compare our results with the recent data from RHIC experiments. Our model
leads to Cronin enhancement at mid-rapidity, while at forward rapidities it
predicts strong suppression of R(dAu) at all pT due to low-x evolution. We
demonstrate that our results are consistent with the data for dAu charged
hadron spectra, R(dAu) and R(CP) recently reported for rapidities in the
interval eta=0--3.2 by the BRAHMS experiment at RHIC. We also make a prediction
for R(pA) at mid-rapidity in pA collisions at the LHC.Comment: 8 pages, 4 figures; results for negatively charged hadrons at forward
rapidities are adde
- …