The cross section for high-E-T dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV2 and a photon-proton center-of-mass energy in the range 142 < W-gamma p < 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E-T(jet1)> 20 GeV and E-T(jet2)> 15 GeV and pseudorapidity (with respect to the proton beam direction) requirements of -1 < 3, with at least one of the jets satisfying -1 < 2.5. The measurements show sensitivity to the parton distributions in the photon and proton and to effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon. RI De Pasquale, Salvatore/B-9165-2008; Wing, Matthew/C-2169-2008; Doyle, Anthony/C-5889-2009; IBRAHIM, ZAINOL ABIDIN/C-1121-2010; Fazio, Salvatore /G-5156-2010; WAN ABDULLAH, WAN AHMAD TAJUDDIN/B-5439-2010; Ferrando, James/A-9192-2012; Gladilin, Leonid/B-5226-2011

The cross section for high-E(T) dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV(2) and a photon-proton center-of-mass energy in the range 142 < W(gamma p)< 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E(T)(jet1)> 20 GeV and E(T)(jet2)> 15 GeV and pseudorapidity (with respect to the proton beam direction) requirements of -1 < 3, with at least one of the jets satisfying -1 < 2.5. The measurements show sensitivity to the parton distributions in the photon and proton and to effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon.

The cross section for high-E(T) dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV(2) and a photon-proton center-of-mass energy in the range 142 < W(gamma p)< 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E(T)(jet1)> 20 GeV and E(T)(jet2)> 15 GeV and pseudorapidity (with respect to the proton beam direction) requirements of -1 < 3, with at least one of the jets satisfying -1 < 2.5. The measurements show sensitivity to the parton distributions in the photon and proton and to effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon.

High-E-T dijet photoproduction at HERA

CAPUA, Marcella;Fazio S;MASTROBERARDINO, Anna;Schioppa M;TASSI, Enrico;
2007-01-01

Abstract

The cross section for high-E(T) dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV(2) and a photon-proton center-of-mass energy in the range 142 < W(gamma p)< 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E(T)(jet1)> 20 GeV and E(T)(jet2)> 15 GeV and pseudorapidity (with respect to the proton beam direction) requirements of -1 < 3, with at least one of the jets satisfying -1 < 2.5. The measurements show sensitivity to the parton distributions in the photon and proton and to effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon.
2007
The cross section for high-E-T dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV2 and a photon-proton center-of-mass energy in the range 142 &lt; W-gamma p &lt; 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E-T(jet1)&gt; 20 GeV and E-T(jet2)&gt; 15 GeV and pseudorapidity (with respect to the proton beam direction) requirements of -1 &lt; 3, with at least one of the jets satisfying -1 &lt; 2.5. The measurements show sensitivity to the parton distributions in the photon and proton and to effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon. RI De Pasquale, Salvatore/B-9165-2008; Wing, Matthew/C-2169-2008; Doyle, Anthony/C-5889-2009; IBRAHIM, ZAINOL ABIDIN/C-1121-2010; Fazio, Salvatore /G-5156-2010; WAN ABDULLAH, WAN AHMAD TAJUDDIN/B-5439-2010; Ferrando, James/A-9192-2012; Gladilin, Leonid/B-5226-2011
The cross section for high-E(T) dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb(-1). The events were required to have a virtuality of the incoming photon, Q(2), of less than 1 GeV(2) and a photon-proton center-of-mass energy in the range 142 &lt; W(gamma p)&lt; 293 GeV. Events were selected if at least two jets satisfied the transverse-energy requirements of E(T)(jet1)&gt; 20 GeV and E(T)(jet2)&gt; 15 GeV and pseudorapidity (with respect to the proton beam direction) requirements of -1 &lt; 3, with at least one of the jets satisfying -1 &lt; 2.5. The measurements show sensitivity to the parton distributions in the photon and proton and to effects beyond next-to-leading order in QCD. Hence these data can be used to constrain further the parton densities in the proton and photon.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/131930
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