First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron-proton collider using an integrated luminosity of 121 pb^-1. A signal for isolated photons in the transverse energy and rapidity ranges 5 < E_T^gamma < 10 GeV and -0.7 < eta^gamma < 0.9 was observed for virtualities of the exchanged photon of Q^2 > 35 GeV^2. Cross sections are presented for inclusive prompt photons and for those accompanied by a single jet in the range E_T^jet geq 6 GeV and -1.5 leq eta^jet < 1.8. Calculations at order alpha^3alpha_s describe the data reasonably well.
S. Chekanov, M. Derrick, D. Krakauer, J.H. Loizides 1, S. Magill, B. Musgrave, et al. (2004). Observation of isolated high-E_T photons in deep inelastic scattering. PHYSICS LETTERS. SECTION B, 595 (2004) 86-100, 86-100 [10.1016/j.physletb.2004.05.033].
Observation of isolated high-E_T photons in deep inelastic scattering
BASILE, MAURIZIO;CIFARELLI, LUISA;CONTIN, ANDREA;PALMONARI, FEDERICO;RINALDI, LORENZO;SARTORELLI, GABRIELLA;ZICHICHI, ANTONINO;
2004
Abstract
First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron-proton collider using an integrated luminosity of 121 pb^-1. A signal for isolated photons in the transverse energy and rapidity ranges 5 < E_T^gamma < 10 GeV and -0.7 < eta^gamma < 0.9 was observed for virtualities of the exchanged photon of Q^2 > 35 GeV^2. Cross sections are presented for inclusive prompt photons and for those accompanied by a single jet in the range E_T^jet geq 6 GeV and -1.5 leq eta^jet < 1.8. Calculations at order alpha^3alpha_s describe the data reasonably well.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
