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Soft gluons and superleading logarithms in QCD

After a brief introduction to the physics of soft gluons in QCD we present a surprising prediction. Dijet production in hadron-hadron collisions provides the paradigm, i.e. h_1 +h_2 \to jj+X. In particular, we look at the case where there is a restriction placed on the emission of any further jets i...

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Detalles Bibliográficos
Autores principales: Forshaw, J.R., Seymour, M.H.
Lenguaje:eng
Publicado: 2009
Materias:
Acceso en línea:https://dx.doi.org/10.1016/j.nuclphysbps.2009.03.133
http://cds.cern.ch/record/1156761
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author Forshaw, J.R.
Seymour, M.H.
author_facet Forshaw, J.R.
Seymour, M.H.
author_sort Forshaw, J.R.
collection CERN
description After a brief introduction to the physics of soft gluons in QCD we present a surprising prediction. Dijet production in hadron-hadron collisions provides the paradigm, i.e. h_1 +h_2 \to jj+X. In particular, we look at the case where there is a restriction placed on the emission of any further jets in the region in between the primary (highest p_T) dijets. Logarithms in the ratio of the jet scale to the veto scale can be summed to all orders in the strong coupling. Surprisingly, factorization of collinear emissions fails at scales above the veto scale and triggers the appearance of double logarithms in the hard sub-process. The effect appears first at fourth order relative to the leading order prediction and is subleading in the number of colours.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-11567612023-03-14T19:01:04Zdoi:10.1016/j.nuclphysbps.2009.03.133http://cds.cern.ch/record/1156761engForshaw, J.R.Seymour, M.H.Soft gluons and superleading logarithms in QCDParticle Physics - PhenomenologyAfter a brief introduction to the physics of soft gluons in QCD we present a surprising prediction. Dijet production in hadron-hadron collisions provides the paradigm, i.e. h_1 +h_2 \to jj+X. In particular, we look at the case where there is a restriction placed on the emission of any further jets in the region in between the primary (highest p_T) dijets. Logarithms in the ratio of the jet scale to the veto scale can be summed to all orders in the strong coupling. Surprisingly, factorization of collinear emissions fails at scales above the veto scale and triggers the appearance of double logarithms in the hard sub-process. The effect appears first at fourth order relative to the leading order prediction and is subleading in the number of colours.After a brief introduction to the physics of soft gluons in QCD we present a surprising prediction. Dijet production in hadron-hadron collisions provides the paradigm, i.e. h_1 +h_2 \to jj+X. In particular, we look at the case where there is a restriction placed on the emission of any further jets in the region in between the primary (highest p_T) dijets. Logarithms in the ratio of the jet scale to the veto scale can be summed to all orders in the strong coupling. Surprisingly, factorization of collinear emissions fails at scales above the veto scale and triggers the appearance of double logarithms in the hard sub-process. The effect appears first at fourth order relative to the leading order prediction and is subleading in the number of colours.arXiv:0901.3037MAN-HEP-2009-3CERN-TH-2009-012MAN-HEP-2009-3CERN-PH-TH-2009-012oai:cds.cern.ch:11567612009-01-21
spellingShingle Particle Physics - Phenomenology
Forshaw, J.R.
Seymour, M.H.
Soft gluons and superleading logarithms in QCD
title Soft gluons and superleading logarithms in QCD
title_full Soft gluons and superleading logarithms in QCD
title_fullStr Soft gluons and superleading logarithms in QCD
title_full_unstemmed Soft gluons and superleading logarithms in QCD
title_short Soft gluons and superleading logarithms in QCD
title_sort soft gluons and superleading logarithms in qcd
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1016/j.nuclphysbps.2009.03.133
http://cds.cern.ch/record/1156761
work_keys_str_mv AT forshawjr softgluonsandsuperleadinglogarithmsinqcd
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