8,686 research outputs found
Central production of lepton-antilepton pairs and heavy quark composite states in hadron diffractive collisions at ultrahigh energies
Central production of lepton-lepton pairs ( and ) and
heavy quark composite states (charmonia and bottomonia) in diffractive proton
collisions (proton momenta transferred ) are
studied at ultrahigh energies (), where
with 1\la N\la 2. The -rescattering
corrections, which are not small, are calculated in terms of the -matrix
approach modified for ultrahigh energies. Two versions of hadron interactions
are considered in detail: the growth (i) ,
within the black disk mode and (ii)
, within the
resonant disk mode. The energy behavior of the diffractive production processes
differs strongly for these modes, thus giving a possibility to distinguish
between the versions of the ultrahigh energy interactions.Comment: 10 pages. arXiv admin note: substantial text overlap with
arXiv:1408.069
Prospects of detecting massive isosinglet neutrino at LHC in the CMS detector
A possibility to search for a heavy isosinglet (sterile) neutrino using its
decay mode in the - channel production in the CMS experiment is studied. The only
assumption about the heavy neutrino is its nonzero mixing with or
. The corresponding CMS discovery potential expressed in terms of
the heavy neutrino mass and the mixing parameter between the heavy and light
neutrino is determined. It is shown that the heavy neutrino with a mass up to
800 could be detected in CMS. We also investigate the production of the
heavy neutrino mixed with and/or in the model through the reaction with the same heavy neutrino decay channel as
above. We find that for it is possible to discover the heavy
neutrino with a mass up to .Comment: 14 pages, 13 figure
Zeros of the Partition Function for Higher--Spin 2D Ising Models
We present calculations of the complex-temperature zeros of the partition
functions for 2D Ising models on the square lattice with spin , 3/2, and
2. These give insight into complex-temperature phase diagrams of these models
in the thermodynamic limit. Support is adduced for a conjecture that all
divergences of the magnetisation occur at endpoints of arcs of zeros protruding
into the FM phase. We conjecture that there are such arcs for , where denotes the integral part of .Comment: 8 pages, latex, 3 uuencoded figure
- …