19 research outputs found
Structures in Multiplicity Distributions and Oscillations of Moments
The possibility to relate multiplicity distributions and their moments, as
measured in the hadronic final state in e(+)e(-) annihilation, to features of
the initial partonic state is analyzed from a theoretical and phenomenological
point of view. Recent developments on the subject are discussed.Comment: 13 pages, 3 figures (PS included); LaTeX 2e compatibility mode, uses
epsfig and amstex. Available also via
http://www.thep.lu.se/tf2/hep/article.hep.html . To be published in the
Proceedings of XXVI Multiparticle Dynamics (Faro, Portugal, Sept 96
Forward-Backward Multiplicity Correlations in Symmetric and Asymmetric High Energy Collisions
Forward-backward correlations are explored within the two-component clan
model of multiparticle production. It is found that existing data are well
described, and, in hh collisions, that clans must be allowed to leak particles
from one hemisphere to the other. General formulae given for the symmetric case
are then extended to the asymmetric one, which is relevant for pA and AB
collisions.Comment: 5 pages, no figures. Talk given at XXXII Int.l Symp. on Multiparticle
Dynamics (Alushta, Crimea, Ukraine, Sept. 7-13, 2002
Clan structure analysis and new physics signals in pp collisions at LHC
The study of possible new physics signals in global event properties in pp
collisions in full phase space and in rapidity intervals accessible at LHC is
presented. The main characteristic is the presence of an elbow structure in
final charged particle MD's in addition to the shoulder observed at lower c.m.
energies.Comment: 9 pages, talk given at Focus on Multiplicity (Bari, Italy, June 2004
Scenarios for multiplicity distributions in pp collisions in the TeV energy region
Possible scenarios based on available experimental data and phenomenological
knowledge of the GeV energy region are extended to the TeV energy region in the
framework of the weighted superposition mechanism of soft and semi-hard events.
KNO scaling violations, forward-backward multiplicity correlations, Hq vs. q
oscillations and shoulder structures are discussed.Comment: 10 pages, 10 figures, talk given at "Focus on Multiplicity" (Bari,
Italy, June 2004
Superposition effect and clan structure in forward-backward multiplicity correlations
The main purpose of this paper is to discuss the link between
forward-backward multiplicity correlations properties and the shape of the
corresponding final charged particle multiplicity distribution in various
classes of events in different collisions. It is shown that the same mechanism
which explains the shoulder effect and the H_n vs. n oscillations in charged
particle multiplicity distributions, i.e., the weighted superposition of
different classes of events with negative binomial properties, reproduces
within experimental errors also the forward-backward multiplicity correlation
strength in e+e- annihilation at LEP energy and allows interesting predictions
for pp collisions in the TeV energy region, to be tested at LHC, for instance
with the ALICE detector. We limit ourselves at present to study substructures
properties in hadron-hadron collisions and e+e- annihilation; they are examined
as ancillary examples in the conviction that their understanding might be
relevant also in other more complex cases.Comment: 16 page