26 research outputs found
Mass and CKM Matrices of Quarks and Leptons, the Leptonic CP-phase in neutrino oscillations
A general approach for construction of quark and lepton mass matrices is
formulated. The hierarchy of quarks and charged leptons ("electrons") is large,
it leads using the experimental values of mixing angles to the hierarchical
mass matrix slightly deviating from one's suggested earlier by Stech and
including naturally the CP-phase.
The same method based on the rotation of generation numbers in the diagonal
mass matrix is used in the electron-neutrino sector of theory, where neutrino
mass matrix is determined by the Majorano see-saw approach. The hierarchy of
neutrino masses, much smaller than for quarks, was used including all existing
(even preliminary) experimental data on neutrinos mixing.
The leptonic mass matrix found in this way includes not known value of the
leptonic CP-phase. It leads to a large oscillations and
suppresses the and also oscillations. The
explicit expressions for the probabilities of neutrino oscillation were
obtained in order to specify the role of leptonic CP-phase. The value of time
reversal effect (proportional to ) was found to be small . However, a dependence of the values of
transition probabilities, averaged over oscillations, on the leptonic CP-phase
has found to be not small - of order of tens percent.Comment: 21 pages, 2 figures, some correction
The general relation between the weak inclusive decays of bound and free heavy quarks
We derive a new parton formula for the inclusive B decays and briefly discuss
its applications to semileptonic and weak radiative decays of the B-meson.Comment: espcrc2.sty (included), 3 pages, Presented at the Third International
Conference on Hyperons, Charm and Beauty Hadrons, Genova, June 30 --July 3,
1998, to appear in proceeding
Charmed decays of the B-meson in the quark model
Exclusive and inclusive, semileptonic and non-leptonic, charmed decays of the
B-meson are investigated in the context of a phenomenological quark model.
Bound-state effects are taken care of by adopting a single (model-dependent)
non-perturbative wave function, describing the motion of the light spectator
quark in the B-meson. A nice reproduction of both exclusive and inclusive
semileptonic data is obtained. Our predictions for the electron spectrum are
presented and compared with those of the Isgur-Scora-Grinstein-Wise quark
model. Finally, our approach is applied to the calculation of inclusive
non-leptonic widths, obtaining a remarkable agreement with experimental
findings.Comment: to appear in the Proc. of the 2^{nd} Int. Conf. on Hyperons, Charm
and Beauty Hadrons, Montreal, Canada, 27-30 August 199
All-loop calculation of the Reggeon field theory amplitudes via stochastic model
The evolution equations for Green functions of the Reggeon Field Theory (RFT)
are equivalent to those of the inclusive distributions for the
reaction-diffusion system of classical particles. We use this equivalence to
obtain numerically Green functions and amplitudes of the RFT with all loop
contributions included. The numerical realization of the approach is described
and some important applications including total and elastic proton--proton
cross sections are studied. It is shown that the loop diagram contribution is
essential but can be imitated in the eikonal cross section description by
changing the Pomeron intercept. A role of the quartic Pomeron coupling which is
an inherent part of the stochastic model is shown to be negligible for
available energies.Comment: In v2: discussion extended and one new figure added within section 4.
References added in sections 1 and
On the role of longitudinal momenta in high energy hadron-hadron scattering
We demonstrate a new method for the calculation of inelastic scattering
cross-section, which in contrary to the Regge-based methods takes into account
the energy momentum conservation law. By virtue of this method it was shown
that the main contribution to integral expressing inelastic scattering
cross-sections comes not from the multi-Regge domain. In particular this leads
to the fact that accounting of longitudinal momenta contribution to
virtualities is sufficient and results in the new mechanism of cross-section
growth. The necessity of taking into account the large number of interference
contributions is shown and the approximate method for this purpose is
developed. By considering the interference contributions from a single fitting
constant achieved a qualitative agreement of the total and inelastic cross
sections with experimental data.Comment: 38 pages, 19 figures (A misspelled author's name corrected
Photon-Photon and Pomeron-Pomeron Processes in Peripheral Heavy Ion Collisions
We estimate the cross sections for the production of resonances, pion pairs
and a central cluster of hadrons in peripheral heavy-ion collisions through
two-photon and double-pomeron exchange, at energies that will be available at
RHIC and LHC. The effect of the impact parameter in the diffractive reactions
is introduced, and imposing the condition for realistic peripheral collisions
we verify that in the case of very heavy ions the pomeron-pomeron contribution
is indeed smaller than the electromagnetic one. However, they give a
non-negligible background in the collision of light ions. This diffractive
background will be more important at RHIC than at LHC.Comment: 22 pages, 1 Postscript figures, 4 tables, to appear in Phys. Rev.
The triple-pomeron regime and the structure function of the pomeron in the diffractive deep inelastic scattering at very small x
Misprints and numerical coefficients corrected, a bit of phenomenology and
one figure added. The case for the linear evolution of the unitarized structure
functions made stronger.Comment: KFA-IKP(Th)-1993-17, Landau-16/93, 46 pages, 14 figures upon request
from N.Nikolaev, [email protected]
The first dozen years of the history of ITEP Theoretical Physics Laboratory
The theoretical investigations at ITEP in the years 1945-1958 are reviewed.
There are exposed the most important theoretical results, obtained in the
following branches of physics: 1) the theory of nuclear reactors on thermal
neutrons; 2) the hydrogen bomb project ("Tube" in USSR and "Classical Super" in
USA); 3) radiation theory; ~4) low temperature physics; 5) quantum
electrodynamics and quantum field theories; 6) parity violation in weak
interactions, the theory of -decay and other weak processes; 7) strong
interaction and nuclear physics. To the review are added the English
translations of few papers, originally published in Russian, but unknown (or
almost unknown) to Western readers.Comment: 55 pages, 5 fig
Production of Secondaries in High Energy d+Au Collisions
In the framework of Quark-Gluon String Model we calculate the inclusive
spectra of secondaries produced in d+Au collisions at intermediate (CERN SPS)
and at much higher (RHIC) energies. The results of numerical calculations at
intermediate energies are in reasonable agreement with the data. At RHIC
energies numerically large inelastic screening corrections (percolation
effects) should be accounted for in calculations. We extract these effects from
the existing RHIC experimental data on minimum bias and central d+Au
collisions. The predictions for p+Au interactions at LHC energy are also given.Comment: 18 pages and 10 figure
Charged multiplicities in pp and AA collisions at LHC
The mid-rapidity charged particle multiplicities in pp and AA collisions at
LHC energies are described in the framework of a generalized eikonal model with
shadowing corrections incorporated in AA. We show that the pp data require a
Pomeron intercept close to 1.2, higher than the conventional one close to 1.1.
An energy dependence is obtained in the LHC range and beyond. The
size and centrality dependence of the AA multiplicity at TeV
is reproduced and its energy dependence is predicted.Comment: 12 pages, 4 figures, 2 tables To be published in EPJ