Professor Claire Gwenlan: Publications

Inclusive jet cross sections in the Breit frame in neutral current deep inelastic scattering at HERA and determination of α s

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 547:3-4 (2002) 164-180

Authors:

S Chekanov, D Krakauer, S Magill, B Musgrave, J Repond, R Yoshida, MCK 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, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, D Bartsch, I Brock, J Crittenden, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, R Renner, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, DS Bailey, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Wing, M Capua, A Mastroberardino, M Schioppa, G Susinno, JY Kim, YK Kim, JH Lee, IT Lim, MY Pac, A Caldwell, M Helbich, X Liu, B Mellado, Y Ning, S Paganis, Z Ren, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Olkiewicz, K Piotrzkowski, MB Przybycień, P Stopa, L Zawiejski, L Adamczyk, T Bold, I Grabowska-Bold, D Kisielewska, AM Kowal, M Kowal, T Kowalski, M Przybycień, L Suszycki, D Szuba, J Szuba, A Kotański

Abstract:

Inclusive jet differential cross sections have been measured in neutral current deep inelastic e ⁺p scattering for boson virtualities Q ² > 125 GeV ². The data were taken using the ZEUS detector at HERA and correspond to an integrated luminosity of 38.6 pb ^-1. Jets were identified in the Breit frame using the longitudinally invariant k T cluster algorithm. Measurements of differential inclusive jet cross sections are presented as functions of jet transverse energy (E ^B T.jet), jet pseudorapidity and Q ², for jets with E ^B T.jet > 8 GeV. Next-to-leading-order QCD calculations agree well with the measurements both at high Q ² and high E ^B T.jet. The value of α s(M z), determined from an analysis of dσ/dQ ² for Q ² > 500 GeV ², is α s(M Z=0.1212±0.0017 (stat.) ^+0.0023 -0.0031 (syst.) ^+0.0028 -0.0027(th.). © 2002 Elsevier Science B.V. All rights reserved.

Searches for excited fermions in ep collisions at HERA

Physics Letters B 549 (2002) 32-47

Authors:

RA Walczak, A. Sabetfakhri, A. Weber, F. Sciulli

Measurement of diffractive production of D*±(2010) mesons in deep-inelastic scattering at HERA

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 545:3-4 (2002) 244-260

Authors:

S Chekanov, D Krakauer, S Magill, B Musgrave, J Repond, R Yoshida, MCK 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, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, D Bartsch, I Brock, J Crittenden, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, R Renner, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, DS Bailey, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Wing, M Capua, A Mastroberardino, M Schioppa, G Susinno, JY Kim, YK Kim, JH Lee, IT Lim, MY Pac, A Caldwell, M Helbich, X Liu, B Mellado, S Paganis, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Olkiewicz, K Piotrzkowski, MB Przybycień, P Stopa, L Zawiejski, L Adamczyk, B Bednarek, I Grabowska-Bold, K Jeleń, D Kisielewska, AM Kowal, M Kowal, T Kowalski, B Mindur, E Rulikowska-Zarebska, L Suszycki, D Szuba, J Szuba, A Kotański, et al

Abstract:

Diffractive production of D^*±(2010) mesons in deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 44.3 pb^-1. Diffractive charm production is identified by the presence of a large rapidity gap in the final state of events in which a D^*±(2010) meson is reconstructed in the decay channel D^*+ → (D⁰ → K^-π⁺)πs ⁺ (+ charge conjugate). Differential cross sections when compared with theoretical predictions indicate the importance of gluons in such diffractive interactions. © 2002 Elsevier Science B.V. All rights reserved.

Multijets in photoproduction at HERA

Acta Physica Polonica B 33:10 (2002) 3123-3128

Abstract:

Cross-sections for the photoproduction of events containing four high-ET jets have been measured with the ZEUS detector using an integrated luminosity of 38.7 pb^-1. At low invariant mass of the four-jet system, m4J, the observed event distributions are sensitive to the underlying event model. The inclusion of multi-parton interactions in Monte Carlo simulations lead to a significantly better description of the data. For m4J > 50 GeV the data is adequately described by models with no simulation of an underlying event, suggesting that this is a kinematic region suitable for comparison with perturbative QCD calculations.

Leading neutron production in e+p collisions at HERA

Nuclear Physics B 637 (2002) 3-56

Authors:

B Foster, G. Levman, W. Schmidke, R. Yoshida

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