Professor Claire Gwenlan: Publications

Search for lepton-flavor violation in e⁺p collisions at DESY HERA -: art. no. 092004

PHYSICAL REVIEW D 65:9 (2002) ARTN 092004

Authors:

S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, 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, G Levi, A Margotti, T Massam, 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, H Wessoleck, 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, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, M Helbich, X Liu, B Mellado, S Paganis, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Olkiewicz, MB Przybycien, P Stopa, L Zawiejski, B Bednarek, I Grabowska-Bold, K Jelen, D Kisielewska, AM Kowal, M Kowal, T Kowalski, B Mindur, M Przybycien, E Rulikowska-Zarebska, L Suszycki, D Szuba, J Szuba, A Kotanski, W Slominski, LAT Bauerdick, U Behrens, K Borras, V Chiochia, D Dannheim, K Desler, G Drews, J Fourletova, A Fox-Murphy, U Fricke, A Geiser, F Goebel, P Göttlicher, R Graciani, T Haas, W Hain, GF Hartner, S Hillert, U Kötz, H Kowalski, H Labes, D Lelas, B Löhr, R Mankel, J Martens, M Martínez, M Moritz, D Notz, MC Petrucci, A Polini, U Schneekloth, F Selonke, S Stonjek, B Surrow, JJ Whitmore, R Wichmann, G Wolf, C Youngman, W Zeuner, C Coldewey, ALD Viani, A Meyer, S Schlenstedt, G Barbagli, E Gallo, C Genta, PG Pelfer, A Bamberger, A Benen, N Coppola, P Markun, H Raach, S Wölfle, M Bell, PJ Bussey, AT Doyle, C Glasman, S Hanlon, SW Lee, A Lupi, GJ McCance, DH Saxon, IO Skillicorn, B Bodmann, U Holm, H Salehi, K Wick, A Ziegler, A Ziegler, T Carli, I Gialas, K Klimek, E Lohrmann, M Milite, C Collins-Tooth, C Foudas, R Gonçalo, KR Long, F Metlica, DB Miller, AD Tapper, R Walker, P Cloth, D Filges, M Kuze, K Nagano, K Tokushuku, S Yamada, Y Yamazaki, AN Barakbaev, EG Boos, NS Pokrovskiy, BO Zhautykov, SH Ahn, SB Lee, SK Park, H Lim, D Son, F Barreiro, G García, O González, L Labarga, J del Peso, I Redondo, J Terrón, M Vázquez, M Barbi, A Bertolin, F Corriveau, A Ochs, S Padhi, DG Stairs, M St-Laurent, T Tsurugai, A Antonov, V Bashkirov, P Danilov, BA Dolgoshein, D Gladkov, V Sosnovtsev, S Suchkov, RK Dementiev, PF Ermolov, YA Golubkov, II Katkov, LA Khein, NA Korotkova, IA Korzhavina, VA Kuzmin, BB Levchenko, OY Lukina, AS Proskuryakov, LM Shcheglova, AN Solomin, NN Vlasov, SA Zotkin, C Bokel, J Engelen, S Grijpink, E Koffeman, P Kooijman, E Maddox, S Schagen, E Tassi, H Tiecke, N Tuning, JJ Velthuis, L Wiggers, E de Wolf, N Brümmer, B Bylsma, LS Durkin, J Gilmore, CM Ginsburg, CL Kim, TY Ling, S Boogert, AM Cooper-Sarkar, RCE Devenish, J Ferrando, T Matsushita, M Rigby, O Ruske, MR Sutton, R Walczak, R Brugnera, R Carlin, F Dal Corso, S Dusini, A Garfagnini, S Limentani, A Longhin, A Parenti, M Posocco, L Stanco, M Turcato, L Adamczyk, BY Oh, PRB Saull, Y Iga, G D'Agostini, G Marini, A Nigro, C Cormack, JC Hart, NA McCubbin, C Heusch, IH Park, N Pavel, H Abramowicz, S Dagan, A Gabareen, S Kananov, A Kreisel, A Levy, T Abe, T Fusayasu, T Kohno, K Umemori, T Yamashita, R Hamatsu, T Hirose, M Inuzuka, S Kitamura, K Matsuzawa, T Nishimura, M Arneodo, N Cartiglia, R Cirio, M Costa, MI Ferrero, S Maselli, V Monaco, C Peroni, M Ruspa, R Sacchi, A Solano, A Staiano, R Galea, T Koop, GM Levman, JF Martin, A Mirea, A Sabetfakhri, JM Butterworth, C Gwenlan, R Hall-Wilton, ME Hayes, EA Heaphy, TW Jones, JB Lane, MS Lightwood, BJ West, J Ciborowski, R Ciesielski, G Grzelak, RJ Nowak, JM Pawlak, B Smalska, J Sztuk, T Tymieniecka, A Ukleja, J Ukleja, JA Zakrzewski, AF Zarnecki, M Adamus, P Plucinski, Y Eisenberg, LK Gladilin, D Hochman, U Karshon, J Breitweg, D Chapin, R Cross, D Kçira, S Lammers, DD Reeder, AA Savin, WH Smith, A Deshpande, S Dhawan, VW Hughes, PB Straub, S Bhadra, CD Catterall, S Fourletov, S Menary, M Soares, J Standage

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Three-jet production in diffractive deep inelastic scattering at HERA

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 516:3-4 (2001) 273-292

Authors:

Abstract:

Three-jet production in the reaction ep → eXp has been studied with the ZEUS detector at HERA using an integrated luminosity of 42.74 pb-1.The data were measured in the kinematic region 5 < Q2 < 100 GeV2, 200 < W < 250 GeV and 23 < MX < 40 GeV. The diffractive signal was selected by requiring a large rapidity gap in the outgoing proton direction. Jets were reconstructed in the centre-of-mass system of X using the exclusive kT-algorithm. A sample of three-jet events in diffraction has been identified. Differential cross sections were measured as a function of the jet pseudorapidity and jet transverse momentum with respect to the virtual photon-pomeron axis. The jets going in the pomeron direction are broader than those going in the virtual-photon direction. This is consistent with models predicting that gluons are predominantly produced in the pomeron direction and quarks in the virtual-photon direction. © 2001 Elsevier Science B.V. All rights reserved.

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Study of the effective transverse momentum of partons in the proton using prompt photons in photoproduction at HERA

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 511:1 (2001) 19-32

Authors:

S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Stanek, 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, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, I Brock, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wieber, DS Bailey, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, M Helbich, W Liu, X Liu, B Mellado, S Paganis, S Sampson, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Klimek, K Olkiewicz, MB Przybycień, P Stopa, L Zawiejski, B Bednarek, K Jeleń, D Kisielewska, AM Kowal, T Kowalski, E Rulikowska-Zarebska, L Suszycki, D Szuba, A Kotański, LAT Bauerdick, U Behrens

Abstract:

The photoproduction of prompt photons, together with an accompanying jet, has been measured with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb-1. A study of the effective transverse momentum, (kT), of partons in the proton, as modelled within the framework of the PYTHIA Monte Carlo, gives a value of (kT) = 1.69 ± 0.18 -0.20+0.18 GeV for the γp centre-of-mass energy range 134 < W < 251 GeV. This result is in agreement with the previously observed trend in hadron-hadron scattering for (kT) to rise with interaction energy. © 2001 Elsevier Science B.V.

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Multiplicity moments in deep inelastic scattering at HERA

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 510:1-4 (2001) 36-54

Authors:

S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Stanek, 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, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, I Brock, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wieber, 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, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, M Helbich, W Liu, X Liu, B Mellado, S Paganis, S Sampson, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Klimek, K Olkiewicz, MB Przybycien, P Stopa, L Zawiejski, B Bednarek, K Jeleń, D Kisielewska, AM Kowal, M Kowal, T Kowalski, B Mindur, L Suszycki, D Szuba, E Rulikowska-Zarebska

Abstract:

Multiplicity moments of charged particles in deep inelastic e+p scattering have been measured with the ZEUS detector at HERA using an integrated luminosity of 38.4 pb-1. The moments for Q2 > 1000 GeV2 were studied in the current region of the Breit frame. The evolution of the moments was investigated as a function of restricted regions in polar angle and, for the first time, both in the transverse momentum and in absolute momentum of final-state particles. Analytic perturbative QCD predictions in conjunction with the hypothesis of Local Parton-Hadron Duality (LPHD) reproduce the trends of the moments in polar-angle regions, although some discrepancies are observed. For the moments restricted either in transverse or absolute momentum, the analytic results combined with the LPHD hypothesis show considerable deviations from the measurements. The study indicates a large influence of the hadronisation stage on the multiplicity distributions in the restricted phase-space regions studied here, which is inconsistent with the expectations of the LPHD hypothesis. © 2001 Published by Elsevier Science B.V.

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Measurement of dijet production in neutral current deep inelastic scattering at high Q² and determination of αs

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 507:1-4 (2001) 70-88

Authors:

J Breitweg, S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave, A Pellegrino, J Repond, R Stanek, 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, G Levi, A Margotti, T Massam, R Nania, F Palmonari, A Pesci, G Sartorelli, A Zichichi, G Aghuzumtsyan, C Amelung, I Brock, K Coböken, S Goers, H Hartmann, K Heinloth, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, R Kerger, O Kind, E Paul, J Rautenberg, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, A Weber, H Wieber, DS Bailey, O Barret, NH Brook, JE Cole, B Foster, GP Heath, HF Heath, S Robins, E Rodrigues, J Scott, RJ Tapper, M Capua, A Mastroberardino, M Schioppa, G Susinno, HY Jeoung, JY Kim, JH Lee, IT Lim, KJ Ma, MY Pac, A Caldwell, W Liu, X Liu, B Mellado, S Paganis, S Sampson, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Klimek, K Olkiewicz, MB Przybycień, P Stopa, L Zawiejski, B Bednarek, K Jeleń, D Kisielewska, AM Kowal, T Kowalski, E Rulikowska-Zarebska, L Suszycki

Abstract:

Dijet production has been studied in neutral current deep inelastic e+p scattering for 470 < Q2 < 20000 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 38.4 pb-1. Dijet differential cross sections are presented in a kinematic region where both theoretical and experimental uncertainties are small. Next-to-leading-order (NLO) QCD calculations describe the measured differential cross sections well. A QCD analysis of the measured dijet fraction as a function of Q2 allows both a precise determination of αs(Mz) and a test of the energy-scale dependence of the strong coupling constant. A detailed analysis provides an improved estimate of the uncertainties of the NLO QCD cross sections arising from the paxton distribution functions of the proton. The value of αs(Mz), as determined from the QCD fit, is αs (MZ) = 0.1166 ± 0.0019(stat.)+0.0024-0.0044 (exp.) +0.00570.0044(th.). © 2001 Elsevier Science B.V.

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Professor Claire Gwenlan

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Search for lepton-flavor violation in e⁺p collisions at DESY HERA -: art. no. 092004

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Three-jet production in diffractive deep inelastic scattering at HERA

Authors:

Abstract:

Study of the effective transverse momentum of partons in the proton using prompt photons in photoproduction at HERA

Authors:

Abstract:

Multiplicity moments in deep inelastic scattering at HERA

Authors:

Abstract:

Measurement of dijet production in neutral current deep inelastic scattering at high Q² and determination of αs

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Professor Claire Gwenlan

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Search for lepton-flavor violation in e+p collisions at DESY HERA -: art. no. 092004

Authors:

Three-jet production in diffractive deep inelastic scattering at HERA

Authors:

Abstract:

Study of the effective transverse momentum of partons in the proton using prompt photons in photoproduction at HERA

Authors:

Abstract:

Multiplicity moments in deep inelastic scattering at HERA

Authors:

Abstract:

Measurement of dijet production in neutral current deep inelastic scattering at high Q2 and determination of αs

Authors:

Abstract:

Search for lepton-flavor violation in e⁺p collisions at DESY HERA -: art. no. 092004

Measurement of dijet production in neutral current deep inelastic scattering at high Q² and determination of αs