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Title: Measurement of dijet cross-sections in low $${\rm Q}^2$$ ep collisions and the extraction of an effective parton density for the virtual photon

Abstract

The triple-differential dijet cross-section, d 3 σ e p / d Q 2 d E t ¯ 2 d x γ j e t s , is measured with the H1 detector at HERA as a function of the photon virtuality Q 2 , the fraction of the photon's momentum carried by the parton entering the hard scattering, \x γ j e t s , and the square of the mean transverse energy, E t ¯ 2 , of the two highest E t jets. Jets are found using a longitudinal boost-invariant k T clustering algorithm in the γ ∗ p center of mass frame. The measurements cover the ranges 1.6 < Q 2 < 80 GeV2 in virtuality and 0.1 < y < 0.7 in inelasticity y. The results are well described by leading order QCD models which include the effects of a resolved component to the virtual photon. Models which treat the photon as point-like fail to describe the data. An effective leading order parton density for the virtual photon is extracted as a function of the photon virtuality, the probing scale and the parton momentum fraction. The xγ and probing scale dependences of the parton density show characteristic features of photon structure, and a suppression of this structure with increasing Q 2 is seen.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
The H1 Collaboration
OSTI Identifier:
1511283
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 13; Journal Issue: 3; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; transverse energy; scale dependence; virtual photon; momentum fraction; parton density

Citation Formats

Adloff et al., C. Measurement of dijet cross-sections in low ${\rm Q}^2$ ep collisions and the extraction of an effective parton density for the virtual photon. United States: N. p., 2000. Web. doi:10.1007/s100520000144.
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Adloff et al., C. Measurement of dijet cross-sections in low ${\rm Q}^2$ ep collisions and the extraction of an effective parton density for the virtual photon. United States. https://doi.org/10.1007/s100520000144
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Adloff et al., C. Fri . "Measurement of dijet cross-sections in low ${\rm Q}^2$ ep collisions and the extraction of an effective parton density for the virtual photon". United States. https://doi.org/10.1007/s100520000144. https://www.osti.gov/servlets/purl/1511283.
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@article{osti_1511283,
title = {Measurement of dijet cross-sections in low ${\rm Q}^2$ ep collisions and the extraction of an effective parton density for the virtual photon},
author = {Adloff et al., C.},
abstractNote = {The triple-differential dijet cross-section, d 3 σ e p / d Q 2 d E t ¯ 2 d x γ j e t s , is measured with the H1 detector at HERA as a function of the photon virtuality Q 2 , the fraction of the photon's momentum carried by the parton entering the hard scattering, \x γ j e t s , and the square of the mean transverse energy, E t ¯ 2 , of the two highest E t jets. Jets are found using a longitudinal boost-invariant k T clustering algorithm in the γ ∗ p center of mass frame. The measurements cover the ranges 1.6 < Q 2 < 80 GeV2 in virtuality and 0.1 < y < 0.7 in inelasticity y. The results are well described by leading order QCD models which include the effects of a resolved component to the virtual photon. Models which treat the photon as point-like fail to describe the data. An effective leading order parton density for the virtual photon is extracted as a function of the photon virtuality, the probing scale and the parton momentum fraction. The xγ and probing scale dependences of the parton density show characteristic features of photon structure, and a suppression of this structure with increasing Q 2 is seen.},
doi = {10.1007/s100520000144},
journal = {European Physical Journal. C, Particles and Fields},
number = 3,
volume = 13,
place = {United States},
year = {Fri Feb 25 00:00:00 EST 2000},
month = {Fri Feb 25 00:00:00 EST 2000}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1007/s100520000144
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Cited by: 31 works
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Figures / Tables:

Fig. 1 Fig. 1: Examples of leading order Feynman diagrams of dijet production in $γ$∗$p$ collisions. In direct processes (top) all of the photon’s 4-momentum enters the hard collision. If the transverse momentum of the outgoing dijets (labelled jet 1 and jet 2 in the figures) is large compared with $Q$2, themore » virtual photon may be resolved (bottom) with only a fraction $x_γ$ < 1 of the photon’s 4-momentum involved. The diagrams are applicable to dijet production with either real or virtual photons« less
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Works referencing / citing this record:

Forward jet production in deep inelastic scattering at HERA
journal, January 1999

  • Breitweg et al., J.
  • The European Physical Journal C, Vol. 6, Issue 2
  • DOI: 10.1007/pl00021621

Measurement of dijet production at low Q 2 at HERA
journal, September 2004

Measurement of dijet cross sections in ep interactions with a leading neutron at HERA
journal, June 2005

Measurement of dijet production at low Q(2) at HERA
text, January 2004

Forward jet Production in deep Inelastic Scattering at hera
conference, January 2012

Forward jet production in deep inelastic scattering at HERA
text, January 2006

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    Figures / Tables found in this record:

    Fig. 1 (p. 4)figure
    Fig. 2 (p. 8)figure
    Table 1 (p. 8)table
    Fig. 3 (p. 10)figure
    Fig. 4 (p. 10)figure
    Table 2 (p. 11)table
    Table 3 (p. 12)table
    Fig. 5 (p. 13)figure
    Table 4 (p. 14)table
    Fig. 6 (p. 15)figure
    Fig. 7 (p. 16)figure
    Fig. 8 (p. 16)figure
    Fig. 10 (p. 17)figure
    Fig. 9 (p. 17)figure
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