Differential inclusive jet cross sections in neutral current deep inelastic ep scattering have been measured with the ZEUS detector using an integrated luminosity of 38.7 pb−1. The jets have been identified using the kTkT cluster algorithm in the longitudinally invariant inclusive mode in the laboratory frame; they have been selected with jet transverse energy, View the MathML sourceETjet above 6 GeV and jet pseudorapidity, ηjetηjet, between −1 and 3. Measurements of cross sections as functions of View the MathML sourceETjet, Björken x and the photon virtuality, Q2Q2, are presented. Three phase-space regions have been selected in order to study parton dynamics from the most global to the most restrictive region of forward-going (close to the proton-beam direction) jets at low x , where the effects of BFKL evolution might be present. The measurements have been compared to the predictions of leading-logarithm parton-shower Monte Carlo models and fixed-order perturbative QCD calculations. In the forward region, View the MathML sourceO(αs1) QCD calculations underestimate the data up to an order of magnitude at low x . An improved description of the data in this region is obtained by including View the MathML sourceO(αs2) QCD corrections, which account for the lowest-order View the MathML sourcetˆ-channel gluon-exchange diagrams, highlighting the importance of such terms in the parton dynamics at low x.
S. Chekanov, M. Derrick, D. Krakauer, J.H. Loizides 1, S. Magill, B. Musgrave, et al. (2006). FORWARD JET PRODUCTION IN DEEP INELASTIC EP SCATTERING AND LOW-X PARTON DYNAMICS AT HERA. PHYSICS LETTERS. SECTION B, 632, 13-26 [10.1016/j.physletb.2005.09.066].
FORWARD JET PRODUCTION IN DEEP INELASTIC EP SCATTERING AND LOW-X PARTON DYNAMICS AT HERA
BASILE, MAURIZIO;CIFARELLI, LUISA;CONTIN, ANDREA;PALMONARI, FEDERICO;RINALDI, LORENZO;SARTORELLI, GABRIELLA;ZICHICHI, ANTONINO;
2006
Abstract
Differential inclusive jet cross sections in neutral current deep inelastic ep scattering have been measured with the ZEUS detector using an integrated luminosity of 38.7 pb−1. The jets have been identified using the kTkT cluster algorithm in the longitudinally invariant inclusive mode in the laboratory frame; they have been selected with jet transverse energy, View the MathML sourceETjet above 6 GeV and jet pseudorapidity, ηjetηjet, between −1 and 3. Measurements of cross sections as functions of View the MathML sourceETjet, Björken x and the photon virtuality, Q2Q2, are presented. Three phase-space regions have been selected in order to study parton dynamics from the most global to the most restrictive region of forward-going (close to the proton-beam direction) jets at low x , where the effects of BFKL evolution might be present. The measurements have been compared to the predictions of leading-logarithm parton-shower Monte Carlo models and fixed-order perturbative QCD calculations. In the forward region, View the MathML sourceO(αs1) QCD calculations underestimate the data up to an order of magnitude at low x . An improved description of the data in this region is obtained by including View the MathML sourceO(αs2) QCD corrections, which account for the lowest-order View the MathML sourcetˆ-channel gluon-exchange diagrams, highlighting the importance of such terms in the parton dynamics at low x.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
