Measurement of the Spin Dependent Structure Function (2007)
At Hera Ball, R. Ball, A. Deshpande, V. W. Hughes, J. Lichtenstadt, G. Ridolfi
: We present estimates of possible data on spin-dependent asymmetries in inclusive scattering of high energy polarized electrons by high energy polarized protons at HERA, including statistical...
Higgs Boson Properties in the Standard Model and its Supersymmetric Extensions (2007)
Ellis, Jonathan Richard, Ridolfi, G, Zwirner, F
We review the realization of the Brout-Englert-Higgs mechanism in the electroweak theory and describe the experimental and theoretical constraints on the mass of the single Higgs boson expected in...
Perturbative corrections to semileptonic b decay distributions (2005)
Aquila, V., Gambino, P., Ridolfi, G., Uraltsev, N.
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...
QCD analysis of first b cross section data at 1.96 TeV (2003)
Cacciari, M, Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
The first data on bottom quark production in p-pbar collisions at 1.96 TeV have recently been obtained by the CDF collaboration. These data probe the region of pt~0, providing a new invaluable input...
Cacciari, M, Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
We update the theoretical predictions for the t-tbar production cross-section at the Tevatron, taking into account the most recent determinations of systematic uncertainties in the extraction of the...
Indication for Light Sneutrinos and Gauginos from Precision Electroweak Data (2001)
Altarelli, Guido, Caravaglios, F, Giudice, Gian Francesco, Gambino, Paolo, Ridolfi, G
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...
Physics at the front-end of a neutrino factory: a quantitative appraisal (2001)
Mangano, Michelangelo L, Alekhin, S I, Anselmino, M, Ball, R D, Boglione, M, D'Alesio, U, ...
We present a quantitative appraisal of the physics potential for neutrino experiments at the front-end of a muon storage ring. We estimate the forseeable accuracy in the determination of several...
On the metastability of the Standard Model vacuum (2001)
Isidori, Gino, Ridolfi, G, Strumia, A
If the Higgs mass $m_H$ is as low as suggested by present experimental information, the Standard Model ground state might not be absolutely stable. We present a detailed analysis of the lower bounds...
Forte, Stefano, Mangano, Michelangelo L, Ridolfi, G
We discuss the determination of polarized parton distributions from charged-current deep-inelastic scattering experiments. We summarize the next-to-leading order treatment of charged-current...
Nason, P, Ridolfi, G, Schneider, O, Tartarelli, F, Vikas, P, Baines, J T M, ...
We review the prospects for bottom production physics at the LHC. Members of the working group who has contributed to this document are: J. Baines, S.P. Baranov, P. Bartalini, A. Bay, E. Bouhova, M....
Third General Meeting of the LEP2 Workshop (2000)
Ridolfi, G, Felcini, Marta, Medcalf, T, Pokorski, Stefan, Verzegnassi, Claudio
New particles:Introduction SUSY. Non-SUSY. Rb anomaly. Z prime.
Photoproduction of heavy quarks at HERA (1999)
Present status and prospects of heavy quark photoproduction studies at HERA are reviewed.
Frixione, Stefano, Nason, P, Ridolfi, G
We consider the resummation of soft-gluon emission in the transverse-momentum distribution of vector mesons in hadronic collisions. We find that the resummed expression in the impact-parameter...
Are Parton Distributions Positive? (1998)
Forte, Stefano, Altarelli, Guido, Ridolfi, G
We show that the naive positivity conditions on polarized parton distributions which follow from their probabilistic interpretation in the naive parton model are reproduced in perturbative QCD at the...
On positivity of parton distributions (1998)
Altarelli, Guido, Forte, Stefano, Ridolfi, G
We discuss the bounds on polarized parton distributions which follow from their definition in terms of cross section asymmetries. We spell out how the bounds obtained in the naive parton model can be...
Theoretical Analysis of Polarized Structure Functions (1998)
Altarelli, Guido, Ball, R D, Forte, Stefano, Ridolfi, G
We review the analysis of polarized structure function data using perturbative QCD at next-to-leading order. We use the most recent experimental data to obtain updated results for polarized parton...
The gluon contribution to the polarized structure function $g_2$ (1997)
We compute the structure function $g_2$ 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.
Heavy quark production: recent developments (1997)
I discuss some aspects of the comparison between QCD predictions and experimental data in charm and bottom production.
What can we learn from polarized structure function data? (1997)
Ball, R D, Ridolfi, G, Altarelli, Guido, Forte, Stefano
We summarise the perturbative QCD analysis of the structure function data for g_1 from longitudinally polarized deep inelastic scattering from proton, deuteron and neutron targets, with particular...
Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
We review the present theoretical and experimental status of heavy quark production in high-energy collisions. In particular, we cover hadro- and photoproduction at fixed target experiments, at HERA...
Determination of the Bjorken Sum and Strong Coupling from Polarized Structure Functions (1997)
Altarelli, Guido, Ball, R D, Forte, Stefano, Ridolfi, G
We present a NLO perturbative analysis of all available data on the polarized structure function g_1(x,Q^2) with the aim of making a quantitative test of the validity of the Bjorken sum rule, of...
Searches for new physics (1996)
Giudice, Gian Francesco, Mangano, Michelangelo L, Ridolfi, G, Rückl, R, Ambrosanio, S, Asai, S, ...
Review of prospects for discovery of new physics signals at LEP2. The areas covered include SUSY, exotic fermions, BESS models, leptoquarks, virtual effects and CP violating observables.
Ball, R D, Forte, Stefano, Ridolfi, G
We perform a full next-to-leading analysis of the the available experimental data on the polarized structure function g_1 of the nucleon, and give a precise determination of its singlet axial charge...
Heavy Flavour Production (1995)
Nason, P, Ridolfi, G, Frixione, Stefano
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...
Differential Distributions for Heavy Flavour Production at HERA (1995)
Frixione, S., Nason, P., Ridolfi, G.
We compute pseudorapidity and transverse momentum distributions for charm and bottom production at HERA. We examine the effect of next-to-leading order QCD corrections, the effect of possible...
Top quark distributions in hadronic collisions (1995)
Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
We present kinematical distributions for top quark pairs produced at the Tevatron \ppbar\ Collider, as predicted within Next-to-Leading-Order QCD. We consider single and double-inclusive...
Scale dependence and small x behaviour of polarized parton distributions (1995)
Ball, R D, Forte, Stefano, Ridolfi, G
We discuss perturbative evolution of the polarized structure function g_1 in the (x,Q^2) plane, with special regard to the small-x region. We determine g_1 in terms of polarized quark and gluon...
Possible dynamical determination of m$_{t}$, m$_{b}$ and m$_{\tau}$ (1995)
Kounnas, Costas, Pavel, I, Ridolfi, G, Zwirner, Fabio
Motivated by four-dimensional superstring models, we consider the possibility of treating the Yukawa couplings of the Minimal Supersymmetric Standard Model (MSSM) as dynamical variables of the...
Altarelli, Guido, Nason, P, Ridolfi, G
The divergent large-order behaviour of the perturbative series relevant for the determination of \as from \tau decay is controlled by the leading ultraviolet (UV) renormalon. Even in the absence of...
Total cross sections for heavy flavour production at HERA (1995)
Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
We compute total cross sections for charm and bottom photoproduction at HERA energies, and discuss the relevant theoretical uncertainties. In particular we discuss the problems arising from the...
Total Cross Sections for Heavy Flavour Production at HERA (1994)
Frixione, S., Mangano, M. L., Nason, P., Ridolfi, G.
We compute total cross sections for charm and bottom photoproduction at HERA energies, and discuss the relevant theoretical uncertainties. In particular we discuss the problems arising from the...
Charm and bottom production: theoretical results versus experimental data (1994)
Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
Testing QCD in charm production (1994)
Ridolfi, G, Frixione, Stefano, Mangano, Michelangelo L, Nason, P
Heavy flavour production in perturbative QCD (1994)
Nason, P, Frixione, Stefano, Mangano, Michelangelo L, Ridolfi, G
Improving the Weizsäcker-Williams approximation in electron-proton collisions (1993)
Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
We critically examine the validity of the Weizs\"acker-Williams approximation in electron-hadron collisions. We show that in its commonly used form it can lead to large errors, and we show how to...
Heavy-quark correlations in photon-hadron collisions (1993)
Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
On the determination of the gluon density of the proton from heavy-flavour production at HERA (1993)
Frixione, Stefano, Mangano, Michelangelo L, Nason, P, Ridolfi, G
CMS: The Compact Muon Solenoid: Letter of intent for a general purpose detector at the LHC (1992)
CMS Collaboration, Della Negra, M, Markytan, M, Neumeister, N, Porth, P, Rohringer, H, ...
The supersymmetric charged Higgs boson mass and LEP phenomenology (1991)
Brignole, A, Ellis, Jonathan Richard, Ridolfi, G, Zwirner, Fabio