Publications by Gavin Salam


RECENT DEVELOPMENTS IN PERTURBATIVE QCD

Deep Inelastic Scattering DIS 2006 WORLD SCIENTIFIC (2007)

GP SALAM


INFRARED SAFE DEFINITION OF JET FLAVOUR

Deep Inelastic Scattering DIS 2006 WORLD SCIENTIFIC (2007)

GP SALAM


Dispelling the N-3 myth for the k(t) jet-finder

PHYSICS LETTERS B 641 (2006) 57-61

M Cacciari, GP Salam


Infrared-safe definition of jet flavour

EUROPEAN PHYSICAL JOURNAL C 47 (2006) 113-124

A Banfi, GP Salam, G Zanderighi


Automated resummation and hadron collider event shapes

NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS 157 (2006) 187-191

GP Salam


Minimal subtraction vs. physical factorisation schemes in small-x QCD

PHYSICS LETTERS B 635 (2006) 320-329

M Ciafaloni, D Colferai, GP Salam, AM Stasto


Developments in perturbative QCD

INTERNATIONAL JOURNAL OF MODERN PHYSICS A 21 (2006) 1778-1790

GP Salam


Revisiting parton evolution and the large-x limit

PHYSICS LETTERS B 634 (2006) 504-507

YL Dokshitzer, G Marchesini, GP Salam


Fall and rise of the gluon splitting function

INTERNATIONAL JOURNAL OF MODERN PHYSICS A 20 (2005) 4450-4455

GP Salam


Principles of general final-state resummation and automated implementation

JOURNAL OF HIGH ENERGY PHYSICS (2005) ARTN 073

A Banfi, GP Salam, G Zanderighi


Principles of general final-state resummation and automated implementation

Journal of High Energy Physics (2005) 1705-1806

A Banfi, GP Salam, G Zanderighi

Next-to-leading logarithmic final-state resummed predictions have traditionally been calculated, manually, separately for each observable. In this article we derive NLL resummed results for generic observables. We highlight and discuss the conditions that the observable should satisfy for the approach to be valid, in particular continuous globalness and recursive infrared and collinear safety. The resulting resummation formula is expressed in terms of certain well-defined characteristics of the observable. We have written a computer program, CAESAR, which, given a subroutine for an arbitrary observable, determines those characteristics, enabling full automation of a large class of final-state resummations, in a range of processes. © SISSA 2005.


Resummation

HERA and the LHC: A Workshop on the Implications of HERA for LHC Physics, HERA-LHC 2005 - Proceedings (2005) 274-287

A Banfi, G Corcella, M Dasgupta, Y Delenda, GP Salam, G Zanderighi

We review the work discussed and developed under the topic "Resummation" at Working Group 2 "Multijet final states and energy flow", of the HERA-LHC Workshop. We emphasise the role played by HERA observables in the development of resummation tools via, for instance, the discovery and resummation of non-global logarithms. We describe the event-shapes subsequently developed for hadron colliders and present resummed predictions for the same using the automated resummation program CAESAR. We also point to ongoing studies at HERA which can be of benefit for future measurements at hadron colliders such as the LHC, specifically dijet Et and angular spectra and the transverse momentum of the Breit current hemisphere.


Experimental determination of parton distributions

HERA and the LHC: A Workshop on the Implications of HERA for LHC Physics, HERA-LHC 2005 - Proceedings (2005) 78-118

T Carli, A Cooper-Sarkar, J Feltesse, A Glazov, C Gwenlan, M Klein, T Laštovička, G Laštovička-Medin, S Moch, B Reisert, G Salam, F Siegert


Introduction to parton distribution functions

HERA and the LHC: A Workshop on the Implications of HERA for LHC Physics, HERA-LHC 2005 - Proceedings (2005) 43-45

M Dittmar, S Forte, A Glazov, S Moch, S Alekhin, G Altarelli, J Andersen, RD Ball, J Blümlein, H Böttcher, T Carli, M Ciafaloni, D Colferai, A Cooper-Sarkar, G Corcella, L Del Debbio, G Dissertori, J Feltesse, A Guffanti, C Gwenlan, J Huston, G Ingelman, M Klein, T Laštovička, G Laštovička-Medin, JI Latorre, L Magnea, A Piccione, J Pumplin, V Ravindran, B Reisert, J Rojo, AS Vera, GP Salam, F Siegert, A Staśto, H Stenzel, C Targett-Adams, RS Thorne, A Tricoli, JAM Vermaseren, A Vogt

We provide an assessment of the impact of parton distributions on the determination of LHC processes, and of the accuracy with which parton distribution functions (PDFs) can be extracted from data, in particular from current and forthcoming HERA experiments. We give an overview of reference LHC processes and their associated PDF uncertainties, and study in detail W and Z production at the LHC. We discuss the precision which may be obtained from the analysis of existing HERA data, tests of consistency of HERA data from different experiments, and the combination of these data. We determine further improvements on PDFs which may be obtained from future HERA data (including measurements of FL), and from combining present and future HERA data with present and future hadron collider data. We review the current status of knowledge of higher (NNLO) QCD corrections to perturbative evolution and deep-inelastic scattering, and provide reference results for their impact on parton evolution, and we briefly examine non-perturbative models for parton distributions. We discuss the state-of-the art in global parton fits, we assess the impact on them of various kinds of data and of theoretical corrections, by providing benchmarks of Alekhin and MRST parton distributions and a CTEQ analysis of parton fit stability, and we briefly present proposals for alternative approaches to parton fitting. We summarize the status of large and small x resummation, by providing estimates of the impact of large x resummation on parton fits, and a comparison of different approaches to small x resummation, for which we also discuss numerical techniques.


Resummed event shapes at hadron-hadron colliders

JOURNAL OF HIGH ENERGY PHYSICS (2004) ARTN 062

A Banfi, GP Salam, G Zanderighi


Resummed event shapes at hadron-hadron colliders

Journal of High Energy Physics 8 (2004) 1633-1664

A Banfi, GP Salam, G Zanderighi

This article introduces definitions for a number of new event shapes and jet-rates in hadron-hadron dijet production. They are designed so as to be measurable in practice at the Tevatron and the LHC, and to be global so that they can be resummed with currently available techniques. We explain how to vary their sensitivity to beam fragmentation, limiting its impact for purely perturbative studies, or deliberately enhancing it so as to focus on non-perturbative effects. Explicit next-to-leading logarithmic resummed results are presented, as obtained with CAESAR. © SISSA/ISAS 2004.


The gluon splitting function at moderately small x

PHYSICS LETTERS B 587 (2004) 87-94

M Ciafaloni, D Colferai, GP Salam, AM Stasto


Event shapes in e(+)e(-) annihilation and deep inelastic scattering

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 30 (2004) PII S0954-3899(04)55941-8

M Dasgupta, GP Salam


Generalized resummation of QCD final-state observables

PHYSICS LETTERS B 584 (2004) 298-305

A Banfi, GP Salam, G Zanderighi


Extending QCD perturbation theory to higher energies

PHYSICS LETTERS B 576 (2003) 143-151

M Ciafaloni, D Colferai, GP Salam, AM Stasto

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