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SUMMARY:Hadronic final states at HERA
DTSTART;VALUE=DATE-TIME:20140704T144500Z
DTEND;VALUE=DATE-TIME:20140704T150000Z
DTSTAMP;VALUE=DATE-TIME:20260519T010353Z
UID:indico-contribution-1259@indico.ific.uv.es
DESCRIPTION:Speakers: Peter Bussey (Glasgow University)\nThe photoproducti
 on of isolated photons\, both inclusive and together \nwith a jet\, has be
 en measured with the ZEUS detector at HERA using an \nintegrated luminosit
 y of 374 pb-1.  A variety of kinematic variables \nthat are sensitive to d
 ifferent aspects of the event dynamics are studied.  \nCross sections are 
 given in terms of the collinearity of the photon and \nthe jet\, the fract
 ion of the proton energy involved in the interaction\, \nand the pseudorap
 idity difference between the photon and the jet.  These \nand other variab
 les are also  studied for different ranges of \nx_gamma^{meas}\, the fract
 ion of the photon energy involved in the \ninteraction\, in order to enhan
 ce the direct and resolved photon components \nof the process.  Differenti
 al cross sections are also presented for \ninclusive isolated-photon produ
 ction as functions of the transverse energy \nand pseudorapidity of the ph
 oton. Higher-order theoretical calculations \nare compared to the results.
   Measurements of normalised cross sections \nfor the production of photon
 s and neutrons at very small angles with \nrespect to the proton beam dire
 ction in deep inelastic scattering are \npresented as a function of the Fe
 ynman variable xF and of the \ncentre-of-mass energy of the virtual photon
 -proton system\, W.  The data are \ntaken with the H1 detector and corresp
 ond to an integrated luminosity of \n131 pb-1.  The measurement is restric
 ted to photons and neutrons in the \npseudorapidity range eta > 7.9.  To t
 est the Feynman scaling hypothesis \nthe W dependence of the xF dependent 
 cross sections is investigated.  \nPredictions of deep inelastic scatterin
 g models and of models for hadronic \ninteractions of high energy cosmic r
 ays are compared to the measured cross \nsections.\n\nhttps://indico.ific.
 uv.es/event/2025/contributions/1259/
LOCATION: Sala 3+4
URL:https://indico.ific.uv.es/event/2025/contributions/1259/
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