Short description
LxJet is a C++ Monte Carlo program devoted to calculation of jet
cross sections at small x at Leading Order (LO) in QCD perturbation theory. It can be also viewed as an event generator
as it allows to generate unweighted events. It uses high energy
factorization approach,
i.e. the cross section is calculated as a convolution of off-shell
gauge-invariant LO matrix elements and unintegrated gluon densities (the approach
originated in Catani, Ciafaloni, Hautmann).
The program uses ROOT
to provide some tools (notably FOAM) and
to store and analyze the generated
events. LxJet is a constantly developing project, but unfortunately I'm unable to prepare a release version for each update right away.
Email me if you have any
questions or comments (my contact info is in the main page).
Notice: LxJet is a discontinued project. At present we work on a completely new LxJetNLO Monte Carlo (see "Projects" in the main page).
Calculations using LxJet
-
Forward trijet production in p-p and p-Pb collisions at LHC,
JHEP 09 (2020) 175
-
Broadening and saturation effects in dijet azimuthal correlations in p-p and p-Pb collisions at \sqrt{s}=5.02 TeV,
Phys.Lett.B 795 (2019) 511-515
-
Estimating nonlinear effects in forward dijet production in ultra-peripheral heavy ion collisions at the LHC,
Eur.Phys.J.C 77 (2017) 5, 353
-
Forward di-jet production in p+Pb collisions in the small-x improved TMD factorization framework,
JHEP 12 (2016) 034, JHEP 02 (2019) 158 (erratum)
-
Resummation effects in forward Z0+jet production at the LHC
Phys. Rev. D92 (2015), 054007,
-
Unintegrated Gluon Distributions for Forward Jets at the LHC
Acta Phys. Polon. B46 (2015), 1527,
-
Small x dynamics in forward-central dijet decorrelations at the LHC
Phys. Lett. B737 (2014) 335-340,
-
Saturation effects in forward-forward dijet production in p+Pb collisions
arXiv:1403.4824
Phys. Rev. D89 (2014), 094014
-
Three jet production and gluon
saturation effects in p-p and p-Pb collisions within high-energy
factorization,
arXiv:1308.0452
, Phys.Rev. D88 (2013) 094001
Notice: some
of the above calculations use the "Sudakov resummation
model" [Phys. Lett. B737 (2014) 335-340] implemented in an external program which takes
LxJet events and "showers" them; email me if you need the plugin.
Source releases:
LxJet v2.0 (available upon request)
-
new processes added
-
implementation of Improved TMD factorization for dijets [JHEP 1509 (2015) 106]
-
support for three-scale unintegrated PDFs
-
some bugs fixed
LxJet v1.1 (
download 790 kB
)
-
a concept of user-modules was introduced; it allows for more transparent management of different runs
-
events with negative weights are now supported
-
other minor changes
-
WARNING: a bug that doesn't allow to run user modules in newer gcc. This was fixed in the newer version (contact me if you need a workaround).
LxJet v1.0 (
source no more available
)
-
hybrid
high energy factorization suitable for forward
jets, (unintegrated and collinear gluon densities)
-
implemented
helicity tree-level amplitudes for all
channels for dijets and three jets
-
implementation
of recursive relation for color
ordered tree-level amplitudes with single off-shell leg for arbitrary
number of gluons
-
currently
the native phase space generator is up to three
final state partons
-
requirements
Credits
The initial versions of the program has been developed during the realization of the grant LIDER/02/35/L-2/10/NCBiR/2011 of dr Krzysztof Kutak. The version 2.0 was developed during my stay at Penn State University.
Last modified: 09/2020
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