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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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24 papers · 2 filters
Open Problems in Heavy Quarkonium Physics
Antonio Vairo
Some recent progress and a personal selection of open problems in heavy quarkonium physics (spectroscopy, decay and production) inspired by the activity of the Quarkonium Working G…
The FLUKA Monte Carlo, non-perturbative QCD and Cosmic Ray cascades
G. Battistoni, A. Fassò, A. Ferrari +2
The FLUKA Monte Carlo code, presently used in cosmic ray physics, contains packages to sample soft hadronic processes which are built according to the Dual Parton Model. This is a…
Transversity and Drell-Yan -Factors
Philip G. Ratcliffe
The Drell-Yan -factors for transversely polarised hadrons are examined. Since transverse spin is peculiar in having no DIS reference point, the effects of higher-order correctio…
Transversity K Factors for Drell-Yan
Philip G. Ratcliffe
The question of the K factor in transversely polarised Drell-Yan (DY) processes is examined. The transverse-spin case is peculiar for the absence of a reference point in deeply ine…
Pion Corrections in Gribov's Approach to the Dyson-Schwinger Equation
Carlo Ewerz
Chiral symmetry breaking in QCD leads to the emergence of pions as Goldstone bosons. Their existence in turn affects the Green functions of the theory. Here we study the effect of…
The 1P quarkonium fine splittings at NLO
Nora Brambilla, Antonio Vairo
We calculate the 1P heavy quarkonium fine splittings at NLO and discuss the impact of the calculation on the chi_b(1P) splittings.
Jet-shape observables
Giuseppe Marchesini
Studies of jet-shape observables in hard processes are summarized together with future developments
Semi-Inclusive DIS and Transversity
Philip G. Ratcliffe
A review is presented of some aspects of semi-inclusive deeply inelastic scattering and transversity. In particular, the role of -dependent and higher-twist (or multi-parton)…
Ultraviolet cascade in the thermalization of the classical phi^4 theory in 3+1 dimensions
C. Destri, H. J. de Vega
We investigate the dynamics of thermalization and the approach to equilibrium in the classical phi^4 theory in 3+1 spacetime dimensions. The non-equilibrium dynamics is studied by…
On the photon energy moments and their `bias' corrections in B -> X_s+γ
D. Benson, I. I. Bigi, N. Uraltsev
Photon energy moments in B -> X_s+γand the impact of experimental cuts are analyzed, including the biases exponential in the effective hardness missed in the conventional OPE. We i…
Effective field theories for heavy quarkonium
Nora Brambilla, Antonio Pineda, Joan Soto +1
We review recent theoretical developments in heavy quarkonium physics from the point of view of Effective Field Theories of QCD. We discuss Non-Relativistic QCD and concentrate on…
A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
Paolo Nason
I show that with simple extensions of the shower algorithms in Monte Carlo programs, one can implement NLO corrections to the hardest emission that overcome the problems of negativ…
Heavy quark expansion in beauty: recent successes and problems
Nikolai Uraltsev
The status of the QCD-based heavy quark expansion is briefly reviewed. A good agreement between properly applied theory and new precision data is observed. Critical remarks on cert…
On the strong-coupling effects in jet bremsstrahlung in the heavy flavor decays
Nikolai Uraltsev
We address the strong-coupling regime effects in the light-like quark jets where the radiated gluons are hard but highly collinear. These may lead to additional contributions in th…
Charm decays
Daniele Pedrini
To write a review on charm decays is not an easy task because of the large amount (fortunately!) of experimental results in the recent years. I was forced to make a selection of to…
Master integrals for the two-loop light fermion contributions to and
U. Aglietti, R. Bonciani, G. Degrassi +1
We give the analytic expressions of the eight master integrals entering our previous computation of two-loop light fermion contributions to and . The results a…
Progress in the small x resummation of the singlet anomalous dimension
Guido Altarelli, Richard D. Ball, Stefano Forte
We summarize our recent results on the small x resummation of the singlet anomalous dimension. We recall the main features of our approach, and briefly describe some work in progre…
The Higgs Working Group: Summary Report 2003
K. A. Assamagan, M. Narain, A. Nikitenko +81
Theoretical progress in Higgs boson production and background processes is discussed with particular emphasis on QCD corrections at and beyond next-to-leading order as well as next…
Two-loop light fermion contribution to Higgs production and decays
U. Aglietti, R. Bonciani, G. Degrassi +1
We compute the electroweak corrections due to the light fermions to the production cross section and to the partial decay widths and . We…
Towards a Nonperturbative Foundation of the Dipole Picture: I. Functional Methods
Carlo Ewerz, Otto Nachtmann
This is the first of two papers in which we study real and virtual photon-proton scattering in a nonperturbative framework. We classify different contributions to this process and…
Exact solution of BFKL equation in jet-physics
G. Marchesini, E. Onofri
It has been recently found that the heavy quark-antiquark QQbar pair multiplicity, in certain phase space region (QQbar at short distance, soft and with small velocity), satisfies…
Perturbative corrections to the semileptonic b-decay moments: E^\ell_{cut} dependence and running-α_s effects in the OPE approach
Nikolai Uraltsev
We have calculated the perturbative corrections to all the structure functions in the semileptonic decays of a heavy quark. Assuming an arbitrary gluon mass as a technical tool all…
The running of the electromagnetic coupling alpha in small-angle Bhabha scattering
A. B. Arbuzov, D. Haidt, C. Matteuzzi +2
A method to determine the running of alpha from a measurement of small-angle Bhabha scattering is proposed and worked out. The method is suited to high statistics experiments at e+…
Moments of semileptonic B decay distributions in the 1/m_b expansion
Paolo Gambino, Nikolai Uraltsev
We report the OPE-based predictions for a number of lepton energy and hadronic mass moments in the inclusive semileptonic B -> X_c \ellνdecays with a lower cut on the charged lepto…