1,070 research outputs found
Search for the Higgs boson: theoretical perspectives
We present a short review of experimental and theoretical constraints on the
mass of the Standard Model Higgs boson. We briefly illustrate the
unsatisfactory aspects of the standard theory, and we present some general
considerations about possible non-standard scenarios.Comment: 13 pages latex, 6 PS figures. Talk given at Les Rencontres de la
Vallee d'Aoste, La Thuile, Italy, March 4-10, 200
Heavy quark production: recent developments
I discuss some aspects of the comparison between QCD predictions and
experimental data in charm and bottom production.Comment: 5 pages Latex, uses epsfig.sty,aipproc.sty, 7 eps figures included.
Talk given at the 5th International Workshop on Deep Inelastic Scattering and
QCD (DIS 97), Chicago, IL, 14-18 Apr 199
Heavy Flavour Production
We review the status of heavy flavour production in QCD. Comparison of
experimental and theoretical results for top and bottom production are given.
Selected topics in charm production are also discussed.Comment: 18 pages, Latex, epsfig, 12 tar-gzip-uuencoded figures. Invited talk
given at the XV International conference "Physics in Collisions", Cracow,
Poland, June 8-10, 199
Indication for Light Sneutrinos and Gauginos from Precision Electroweak Data
The present Standard Model fit of precision data has a low confidence level,
and is characterized by a few inconsistencies. We look for supersymmetric
effects that could improve the agreement among the electroweak precision
measurements and with the direct lower bound on the Higgs mass. We find that
this is the case particularly if the 3.6 sigma discrepancy between sin^2
theta_eff from leptonic and hadronic asymmetries is finally settled more on the
side of the leptonic ones. After the inclusion of all experimental constraints,
our analysis selects light sneutrinos, with masses in the range 55-80 GeV, and
charged sleptons with masses just above their experimental limit, possibly with
additional effects from light gauginos. The phenomenological implications of
this scenario are discussed.Comment: 17 pages LaTex, 9 figures, uses epsfi
Perturbative corrections to semileptonic b decay distributions
We compute O(alpha_s) and O(alpha_s^n beta_0^{n-1}) (BLM) corrections to the
five structure functions relevant for b->q l nu decays and apply the results to
the moments of a few distributions of phenomenological importance. We present
compact analytic one-loop formulae for the structure functions, with proper
subtraction of the soft divergence.Comment: 23 pages, LaTex. A number of textual changes are added for clarity, a
missing definition is provide
The gluon contribution to the polarized structure function
We compute the structure function for a gluon target in perturbative
QCD at order \as. We show that its first moment vanishes, as predicted by the
Burkhardt-Cottingham sum rule.Comment: 9 pages Latex, uses epsfig.sty, 1 eps figure include
Polarized parton distributions in perturbative QCD
We review the main results of next-to-leading order QCD analyses of polarized
deep-inelastic scattering data, with special attention to the assessment of
theoretical uncertainties.Comment: 4 pages Latex, 1 ps figure. Talk given at NUCLEON '99,
Frascati(Italy), June 7-9 199
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