945 research outputs found
Moments of Wigner function and Renyi entropies at freeze-out
Relation between Renyi entropies and moments of the Wigner function,
representing the quantum mechanical description of the M-particle
semi-inclusive distribution at freeze-out, is investigated. It is shown that in
the limit of infinite volume of the system, the classical and quantum
descriptions are equivalent. Finite volume corrections are derived and shown to
be small for systems encountered in relativistic heavy ion collisions.Comment: 15 pages, one figur
Sensitivity to the Standard Model Higgs Boson in Exclusive Double Diffraction
We use a Monte Carlo implementation of recently developed models of double
diffraction to assess the sensitivity of the LHC experiments to Standard Model
Higgs bosons produced in exclusive double diffraction. The signal is difficult
to extract, due to experimental limitations related to the first level trigger,
and to contamination by inclusive double diffractive background. Assuming the
above difficulties can be overcome, the expected signal-to-background ratio is
presented as a function of the experimental resolution on the missing mass.
Injecting a missing mass resolution of 2 GeV, a signal-to-background ratio of
about 0.5 is obtained; a resolution of 1 GeV brings a signal to background
ratio of 1. This result is lower than previous estimates, and the discrepancy
is explained.Comment: Revised versio
Decisive test for the Pomeron at Tevatron
We propose a new measurement to be performed at the Tevatron which can be
decisive to distinguish between Pomeron-based and soft color interaction models
of hard diffractive scattering.Comment: 5 pages, 3 figures, 1 tabel revtex forma
Diffractive Production at the Tevatron and the LHC
We present predictions for the diffractive production of mesons in the
central rapidity region usually covered by collider detectors. The predicted
cross sections are based on the Bialas-Landshoff formalism for both exclusive
and inclusive production and makes use of the DPEMC Monte-Carlo simulation
adapted with kinematics appropriate for small-mass diffractive production. We
compare generator-level results with a CDF measurement for exclusive
production, and study background and other scenarios including the contribution
of inclusive production. The results agree with the Tevatron data and
are extrapolated, highlighting the exclusive \chic production at LHC
energies. A possible new measurement at the Tevatron using the D{\O}forward
detectors is investigated, taking advantage of the dominance of exclusive
production for high enough diffractive mass fraction.Comment: 9 pages, 2 figures, added akcnowledgment
Inclusive Higgs boson and dijet production via Double Pomeron exchange
We evaluate Higgs boson and dijet cross-sections at the Tevatron collider via
Double Pomeron exchange when accompanying particles in the central region are
taken into account. Such {\it inclusive} processes, normalized to the observed
dijet rate observed at run I, noticeably increase the predictions for tagged
(anti)protons in the run II with respect to {\it exclusive} ones, with the
potentiality of Higgs boson detection.Comment: 6pages, 4 figure
Replica analysis of a preferential urn model
We analyse a preferential urn model with randomness using the replica method.
The preferential urn model is a stochastic model based on the concept "the rich
get richer." The replica analysis clarifies that the preferential urn model
with randomness shows a fat-tailed occupation distribution. The analytical
treatments and results would be useful for various research fields such as
complex networks, stochastic models, and econophysics.Comment: 6 pages, 2 figure
Higgs boson production via Double Pomeron Exchange at the LHC
We study Higgs boson production via Double Pomeron Exchange allowing for the
presence of Pomeron remnants. We estimate the number of events produced at the
LHC collider, as a function of the Higgs boson mass and its decay channel. The
model which successfully describes the high mass dijet spectrum observed at
Tevatron (run I) is used to predict rates of events with tagged protons for the
acceptance range of the CMS/Totem experiments. Sizeable cross-sections and
encouraging event selection signals are found, demonstrating especially for
smaller Higgs boson masses the importance to study the diffractive channels.
Tagging of the Pomeron remnants can be exploited to achieve a good resolution
on the Higgs boson mass for inclusive diffractive events, by optimizing an
intermediary analysis between higher cross-sections of the fully {\it
inclusive} mode (all Pomeron remnants) and cleaner signals of the {\it
exclusive} mode (without Pomeron remnants).Comment: 6 pages, 4 eps.figure
Threshold scans in diffractive W pair production via QED processes at the LHC
We propose a new set of measurements which can be performed at the LHC using
roman pot detectors. This new method is based on exploiting excitation curves
to measure kinematical properties of produced particles. We illustrate it in
the case of central diffractive W pair production.Comment: Accepted by Phys. Lett. B - 1 reference adde
Unifying approach to hard diffraction
We find a consistency between two different approaches of hard diffraction,
namely the QCD dipole model and the Soft Colour Interaction approach. A
theoretical interpretation in terms of S-Matrix and perturbative QCD properties
in the small regime is proposed.Comment: 4pages, 1 figure, letter submitted for publicatio
Balance Functions, Correlations, Charge Fluctuations and Interferometry
Connections between charge balance functions, charge fluctuations and
correlations are presented. It is shown that charge fluctuations can be
directly expressed in terms of a balance functions under certain assumptions.
The distortion of charge balance functions due to experimental acceptance is
discussed and the effects of identical boson interference is illustrated with a
simple model.Comment: 1 eps figure included. 5 pages in revtex
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