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.
FORWARD JET PRODUCTION IN DEEP INELASTIC EP SCATTERING AND LOW-X PARTON DYNAMICS AT HERA / S. Chekanov; M. Derrick; D. Krakauer; J.H. Loizides 1; S. Magill; B. Musgrave; J. Repond; R. Yoshida; M.C.K. Mattingly; P. Antonioli; G. Bari; M. Basile; L. Bellagamba; D. Boscherini; A. Bruni; G. Bruni; G. Cara Romeo; L. Cifarelli; F. Cindolo; A. Contin; M. Corradi; S. De Pasquale; P. Giusti; G. Iacobucci; A. Margotti; A. Montanari; R. Nania; F. Palmonari; A. Pesci; A. Polini; L. Rinaldi; G. Sartorelli; A. Zichichi; G. Aghuzumtsyan; D. Bartsch; I. Brock; S. Goers; H. Hartmann; E. Hilger; P. Irrgang. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 632:(2006), pp. 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.
