1,958 research outputs found
Beauty baryon production in pp collisions at LHC and b quark distribution in proton
The production of charmed and beauty hadrons in proton-proton collisions at
high energies are analyzed within the modified quark-gluon string model (QGSM)
including the internal motion of quarks in colliding hadrons. We present some
predictions for the future experiments on the beauty baryon production in
collisions at LHC energies. This analysis allows us to find interesting
information on the Regge trajectories of the heavy (b{\bar b}) mesons and the
sea beauty quark distributions in the proton.Comment: 7 pages, 7 figures. Talk given at EDS'09: 13th International
Conference on Elastic & Diffractive Scattering, CERN, Geneva, 29th June-3rd
July, 200
Polarization of Tau Leptons Produced in Quasielastic Neutrino--Nucleon Scattering
A numerical analysis of the polarization vector of tau leptons produced
through quasielastic neutrino and antineutrino interactions with free nucleons
is given with two models for vector electromagnetic form factors of proton and
neutron. The impact of G parity violating axial and vector second-class
currents is investigated by applying a simple heuristic model for the induced
scalar and tensor form factors.Comment: Thesis of a talk given at the 8th Scientific Conference (SCYSS-04),
Dubna, Russia, 2 - 6 Feb 2004. 11 pages, 6 figures; added references, figures
and discussion; conclusions unchange
Theoretical description of the decays
We calculate the invariant and helicity amplitudes for the transitions
where the
are -type ground and excited states with
quantum numbers . The calculations are
performed in the framework of a covariant confined quark model previously
developed by us. We find that the values of the helicity amplitudes for the
and the are
suppressed compared with those for the ground state
and the excited state . This analysis is
important for the identification of the hidden charm pentaquark states
and which were discovered in the decay chain
because the cascade decay chain
involves the same
final state.Comment: 15 pages, 4 figures. Minor corrections don
Extended Rein-Sehgal model for tau lepton production
The polarization density matrix formalism is employed to include the final
lepton mass and spin into the popular model by Rein and Sehgal for single pion
neutrinoproduction. We investigate the effect of the lepton mass on the
differential cross sections. The lepton polarization evaluated within the
extended RS model is compared against that follows from the single resonance
production model based upon the Rarita-Schwinger formalism with
phenomenological transition form factors.Comment: Contribution to the 3rd International Workshop on Neutrino-Nucleus
Interactions in the Few-GeV Region, 17-21 March, Gran Sasso (Italy
Forward production of beauty baryons in pp collisions at LHC
The production of charmed and beauty baryons in proton-proton collisions at
high energies is analyzed within the modified quark-gluon string model. We
present some predictions for the experiments on the forward beauty baryon
production in pp collisions at LHC energies. This analysis allows us to find
useful information on the Regge trajectories of the heavy (b barb) mesons and
the sea beauty quark distributions in the proton.Comment: 14 pages, 12 figure
Lepton Polarization in Neutrino-Nucleon Interactions
We derive generic formulas for the polarization density matrix of leptons
produced in neutrino and antineutrino collisions and briefly consider some
important particular cases. Next we employ the general formalism in order to
include the final lepton mass and spin into the popular model by Rein and
Sehgal for single pion neutrinoproduction.Comment: Talk given at 10th International Workshop on High-Energy Spin Physics
(SPIN 03), Dubna, Russia, 16-20 Sep 2003. 12 pages; extended version, typos
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