Plasma-Wakefield Accelerator Group: publications

51�� of the azimuthal asymmetry of jets in neutral current deep inelastic scattering at HERA

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 551:3-4 (2003) 226-240

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, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, O Kind, E Paul, J Rautenberg, R Renner, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, M Wang, 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 Helblich, X Lui, B Mellado, Y Ning, S Paganis, Z Ren, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, K Olkiewicz, 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, W Slomiński, LAT Bauerdick, U Behrens

Abstract:

The azimuthal distribution of jets produced in the Breit frame in high-Q² deep inelastic e⁺p scattering has been studied with the ZEUS detector at HERA using an integrated luminosity of 38.6 pb-¹. The measured azimuthal distribution shows a structure that is well described by next-to-leading-order QCD predictions over the Q² range considered, Q² > 125 GeV². © 2002 Elsevier Science B.V. All rights reserved.

Measurement of proton-dissociative diffractive photoproduction of vector mesons at large momentum transfer at HERA: The ZEUS collaboration

European Physical Journal C 26:3 (2003) 389-409

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, G Levi, 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, W Slomiński

Abstract:

Diffractive photoproduction of vector mesons, γp → VY, where Y is a proton-dissociative system, has been measured in e⁺p interactions with the ZEUS detector at HERA using an integrated luminosity of 25 pb^-1. The differential cross section, dσ/dt, is presented for 1.2 < -t < 12 GeV², where t is the square of the four-momentum transferred to the vector meson. The data span the range in photon-proton centre-of-mass energy, W, from 80 GeV to 120 GeV. The t distributions are well fit by a power law, dσ/dt ∝ (-t)^-n. The slope of the effective Pomeron trajectory, measured from the W dependence of the ρ⁰ and φ cross sections in bins of t, is consistent with zero. The ratios dσγ��→φY/dt to dσγ��→ρ0��/dt and dσγ��→J/ψ��/dt to dσγ��→ρ0��/dt increase with increasing -t. Decay-angle analyses for ρ⁰, φ and J/ψ mesons have been carried out. For the ρ⁰ and φ mesons, contributions from single and double helicity flip are observed. The results are compared to expectations of theoretical models.

Search for resonance decays to lepton+jet at DESY HERA and limits on leptoquarks

Physical Review D Particles Fields Gravitation and Cosmology 68:5 (2003) 520041-5200415

Authors:

S Chekanov, M Derrick, D Krakauer, JH Loizides, 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, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, O Kind, U Meyer, E Paul, J Rautenberg, R Renner, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, M Wang, 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, P Stopa, L Zawiejski, L Adamczyk, T Bołd, I Grabowska-Bołd, D Kisielewska, AM Kowal, M Kowal, T Kowalski, M Przybycień, L Suszycki, D Szuba, J Szuba, A Kotański, W Slomiński, V Adler

Abstract:

A search for narrow-width resonances that decay into electron+jet or neutrino+jet has been performed with the ZEUS detector at the DESY ep collider HERA operating at center-of-mass energies of 300 and 318 GeV. An integrated e⁺p luminosity of 114.8 pb^-1 and e^-p luminosity of 16.7 pb^-1 were used. No evidence for any resonance was found. Limits were derived on the Yukawa coupling λ as a function of the mass of a hypothetical resonance that has arbitrary decay branching ratios into eq or vq. These limits also apply to squarks predicted by R-parity-violating supersymmetry. Limits for the production of leptoquarks described by the Buchmüller-Rückl-Wyler model were also derived for masses up to 400 GeV. For λ = 0.1, leptoquark masses up to 290 GeV are excluded.

Erratum to: “Measurement of high-Q2 charged current cross sections in e−p deep inelastic scattering at HERA” [Phys. Lett. B 539 (2002) 197]

Physics Letters B Elsevier 552:3-4 (2003) 308

Authors:

ZEUS Collaboration, B Foster

Measurement of event shapes in deep inelastic scattering at HERA

EUROPEAN PHYSICAL JOURNAL C 27:4 (2003) 531-545

Authors:

S Chekanov, D Krakauer, JH Loizides, S Magill, B Musgrave, J Repond, R Yoshida, MCK Mattingly, P Antonioli, G Bari, M Basile, L Bellagamba, D Boscherini, A Bruni, G Bruni, GC 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, S Goers, H Hartmann, E Hilger, P Irrgang, HP Jakob, A Kappes, UF Katz, O Kind, E Paul, J Rautenberg, R Renner, H Schnurbusch, A Stifutkin, J Tandler, KC Voss, M Wang, 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, P Stopa, L Zawiejski, L Adamczyk, T Bold, I Grabowska-Bold, D Kisielewska, AM Kowal, M Kowal, T Kowalski, M Przybycien, L Suszycki, D Szuba, J Szuba, A Kotanski, W Slominski, LAT Bauerdick, U Behrens, I Bloch, K Borras, V Chiochia, D Dannheim, M Derrick, G Drews, J Fourletova, A Fox-Murphy, U Fricke, A Geiser, F Goebel, P Göttlicher, O Gutsche, T Haas, W Hain, GF Hartner, S Hillert, U Kötz, H Kowalski, G Kramberger, H Labes, D Lelas, B Löhr, R Mankel, IA Melzer-Pellmann, M Moritz, D Notz, MC Petrucci, A Polini, A Raval, U Schneekloth, F Selonke, H Wessoleck, R Wichmann, G Wolf, C Youngman, W Zeuner, ALD Viani, A Meyer, S Schlenstedt, G Barbagli, E Gallo, C Genta, PG Pelfer, A Bamberger, A Benen, N Coppola, M Bell, PJ Bussey, AT Doyle, C Glasman, J Hamilton, S Hanlon, SW Lee, A Lupi, GJ McCance, DH Saxon, IO Skillicorn, I Gialas, B Bodmann, T Carli, U Holm, K Klimek, N Krumnack, E Lohrmann, M Milite, H Salehi, S Stonjek, K Wick, A Ziegler, A Ziegler, C Collins-Tooth, C Foudas, R Gonçalo, KR Long, F Metlica, AD Tapper, P Cloth, D Filges, M Kuze, K Nagano, K Tokushuku, S Yamada, Y Yamazaki, AN Barakbaev, EG Boos, NS Pokrovskiy, BO Zhautykov, H Lim, D Son, F Barreiro, O González, L Labarga, J del Peso, I Redondo, E Tassi, J Terrón, M Vázquez, M Barbi, A Bertolin, F Corriveau, A Ochs, S Padhi, DG Stairs, M St-Laurent, T Tsurugai, A Antonov, P Danilov, BA Dolgoshein, D Gladkov, V Sosnovtsev, S Suchkov, RK Dementiev, PF Ermolov, YA Golubkov, II Katkov, LA Khein, IA Korzhavina, VA Kuzmin, BB Levchenko, OY Lukina, AS Proskuryakov, LM Shcheglova, NN Vlasov, SA Zotkin, C Bokel, J Engelen, S Grijpink, E Koffeman, P Kooijman, E Maddox, A Pellegrino, S Schagen, H Tiecke, N Tuning, JJ Velthuis, L Wiggers, E de Wolf, N Brümmer, B Bylsma, LS Durkin, TY Ling, S Boogert, AM Cooper-Sarkar, RCE Devenish, J Ferrando, G Grzelak, 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, EA Heaphy, BY Oh, PRB Saull, JJ Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, C Cormack, JC Hart, NA McCubbin, C Heusch, IH Park, N Pavel, H Abramowicz, A Gabareen, S Kananov, A Kreisel, A Levy, T Abe, T Fusayasu, S Kagawa, T Kohno, T Tawara, T Yamashita, R Hamatsu, T Hirose, M Inuzuka, S Kitamura, K Matsuzawa, T Nishimura, M Arneodo, MI Ferrero, V Monaco, M Ruspa, R Sacchi, A Solano, R Galea, T Koop, GM Levman, JF Martin, A Mirea, A Sabetfakhri, JM Butterworth, C Gwenlan, R Hall-Wilton, TW Jones, MS Lightwood, BJ West, J Ciborowski, R Ciesielski, RJ Nowak, JM Pawlak, B Smalska, J Sztuk, T Tymieniecka, A Ukleja, J Ukleja, AF Zarnecki, M Adamus, P Plucinski, Y Eisenberg, LK Gladilin, D Hochman, U Karshon, D Kçira, S Lammers, L Li, 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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