24 research outputs found
Estimation of saturation and coherence effects in the KGBJS equation - a non-linear CCFM equation
We solve the modified non-linear extension of the CCFM equation - KGBJS
equation - numerically for certain initial conditions and compare the resulting
gluon Green functions with those obtained from solving the original CCFM
equation and the BFKL and BK equations for the same initial conditions. We
improve the low transversal momentum behaviour of the KGBJS equation by a small
modification
Kinematical constraint effects in the evolution equations based on angular ordering
We study effects of imposing various forms of the kinematical constraints on
the full form of the CCFM equation and its non-linear extension. We find that
imposing the constraint in its complete form modifies significantly way the
shape of gluon density as compared to forms of the constraint used in the
numerical calculations and phenomenological applications. In particular the
resulting gluon density is suppressed for large values of hard scale related
parameter and kT of gluon. This result might be important in description
studies of jet correlations at Large Hadron Collider within CCFM approach.Comment: 11 pages, 11 figure
Single and double inclusive forward jet production at the LHC at = 7 and 13 TeV
We provide a description of the transverse momentum spectrum of single
inclusive forward jets produced at the LHC, at the center-of-mass energies of 7
and 13 TeV, using the high energy factorization (HEF) framework. We
subsequently study double inclusive forward jet production and, in particular,
we calculate contributions to azimuthal angle distributions coming from double
parton scattering. We also compare our results for double inclusive jet
production to those obtained with the Pythia Monte Carlo generator. This
comparison confirms that the HEF resummation acts like an initial state parton
shower. It also points towards the need to include final state radiation
effects in the HEF formalism.Comment: 14 pages, 5 figures, version accepted for PL
Matrix Elements with Vetoes in the CASCADE Monte Carlo Event Generator
We illustrate a study based on a veto technique to match parton showers and
matrix elements in the Cascade Monte Carlo event generator, and present a
numerical application to gluon matrix elements for jet production.Comment: Published in DIS 2012 proceeding
Heavy quark impact factor in kT-factorization
We present the calculation of the finite part of the heavy quark impact factor at next-to-leading logarithmic accuracy in a form suitable for phenomenological studies such as the calculation of the cross-section for single bottom quark production at the LHC within the kT-factorization scheme
Single bottom quark production in kT-factorisation
We present a study within the k T -factorisation scheme on single bottom quark production at the LHC. In particular, we calculate the rapidity and transverse momentum differential distributions for single bottom quark/anti-quark production. In our setup, the unintegrated gluon density is obtained from the NLx BFKL Green function whereas we included mass effects to the Lx heavy quark jet vertex. We compare our results to the corresponding distributions predicted by the usual collinear factorisation scheme. The latter were produced with Pythia 8.1