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Measurement of high- Q 2 deep inelastic scattering cross sections with a longitudinally polarised positron beam at HERA

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 637:4-5 (2006) 210-222

Authors:

S Chekanov, M Derrick, S Magill, S Miglioranzi, B Musgrave, D Nicholass, J Repond, R Yoshida, MCK Mattingly, N Pavel, AG Yagües Molina, S Antonelli, P Antonioli, G Bari, M Basile, L Bellagamba, M Bindi, D Boscherini, A Bruni, G Bruni, L Cifarelli, F Cindolo, A Contin, M Corradi, S De Pasquale, G Iacobucci, A Margotti, R Nania, A Polini, L Rinaldi, G Sartorelli, A Zichichi, G Aghuzumtsyan, D Bartsch, I Brock, S Goers, H Hartmann, E Hilger, HP Jakob, M Jüngst, OM Kind, E Paul, J Rautenberg, R Renner, U Samson, V Schönberg, M Wang, M Wlasenko, NH Brook, GP Heath, JD Morris, T Namsoo, M Capua, S Fazio, A Mastroberardino, M Schioppa, G Susinno, E Tassi, JY Kim, KJ Ma, ZA Ibrahim, B Kamaluddin, WAT Wan Abdullah, Y Ning, Z Ren, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, M Gil, K Olkiewicz, P Stopa, L Zawiejski, L Adamczyk, T Bołd, I Grabowska-Bołd, D Kisielewska, J Łukasik, M Przybycień, L Suszycki, A Kotański, W Słomiński, V Adler, U Behrens, I Bloch, A Bonato, K Borras, N Coppola, J Fourletova, A Geiser, D Gladkov, P Göttlicher, I Gregor, O Gutsche, T Haas, W Hain, C Horn, B Kahle

Abstract:

The cross sections for charged and neutral current deep inelastic scattering in e + p collisions with a longitudinally polarised positron beam have been measured using the ZEUS detector at HERA. The results, based on data corresponding to an integrated luminosity of 23.8 pb -1 at sqrt(s) = 318   GeV, are given for both e + p charged current and neutral current deep inelastic scattering for both positive and negative values of the longitudinal polarisation of the positron beam. Single differential cross sections are presented for the kinematic region Q 2 > 200   GeV 2. The measured cross sections are compared to the predictions of the Standard Model. A fit to the data yields σ CC ( P e = - 1 ) = 7.4 ± 3.9 ( stat. ) ± 1.2 ( syst. )   pb, which is consistent within two standard deviations with the absence of right-handed charged currents in the Standard Model. © 2006 Elsevier B.V. All rights reserved.
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Measurement of high-Q2 deep inelastic scattering cross sections with a longitudinally polarised positron beam at HERA

Physics Letters B 637 (2006) 210-222

Authors:

RC Devenish, A Tapper, A Gabareen, K Nagano
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Forward jet production in deep inelastic ep scattering and low-x parton dynamics at HERA

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 632:1 (2006) 13-26

Authors:

S Chekanov, M Derrick, S Magill, S Miglioranzi, B Musgrave, J Repond, R Yoshida, MCK Mattingly, N Pavel, AG Yagües Molina, 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, HP Jakob, O Kind, U Meyer, E Paul, J Rautenberg, R Renner, KC Voss, M Wang, M Wlasenko, DS Bailey, NH Brook, JE Cole, GP Heath, T Namsoo, S Robins, M Capua, A Mastroberardino, M Schioppa, G Susinno, E Tassi, JY Kim, KJ Ma, M Helbich, Y Ning, Z Ren, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, K Olkiewicz, P Stopa, D Szuba, L Zawiejski, L Adamczyk, T Bołd, I Grabowska-Bołd, D Kisielewska, AM Kowal, J Łukasik, M Przybycień, L Suszycki, J Szuba, A Kotański, W Słomiński, V Adler, U Behrens, I Bloch, K Borras, G Drews, J Fourletova, A Geiser, D Gladkov, P Göttlicher, O Gutsche, T Haas, W Hain, C Horn

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 kT cluster algorithm in the longitudinally invariant inclusive mode in the laboratory frame; they have been selected with jet transverse energy, ETjet above 6 GeV and jet pseudorapidity, ηjet, between -1 and 3. Measurements of cross sections as functions of ETjet, Björken x and the photon virtuality, Q2, 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, O (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 O (αs2) QCD corrections, which account for the lowest-order t̂-channel gluon-exchange diagrams, highlighting the importance of such terms in the parton dynamics at low x. © 2005 Elsevier B.V. All rights reserved.
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A laser-wire system at the ATF extraction line

EPAC 2006 - Contributions to the Proceedings (2006) 738-740

Authors:

ST Boogert, G Blair, G Boorman, A Bosco, L Deacon, C Driouichi, P Karataev, T Kamps, N Delerue, S Dixit, B Foster, F Gannaway, DF Howell, M Qureshi, A Reichold, R Senanayake, A Aryshev, H Hayano, K Kubo, N Terunuma, J Urakawa, LJ Jenner, A Brachmann, J Frisch, M Ross

Abstract:

A new laser-wire (LW) system has been installed at the ATF extraction line at KEK, Tsukuba. The system aims at a micron-scale laser spot size and employs a mode-locked laser system. The purpose-built interaction chamber, light delivery optics, and lens systems are described, and the first results are presented.

Forward jet production in deep inelastic ep scattering and low-x parton dynamics at HERA

PHYSICS LETTERS B 632:1 (2006) 13-26

Authors:

S Chekanov, M Derrick, S Magill, S Miglioranzi, B Musgrave, J Repond, R Yoshida, MCK Mattingly, N Pavel, AGY Molina, 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, 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, HP Jakob, O Kind, U Meyer, E Paul, J Rautenberg, R Renner, KC Voss, M Wang, M Wlasenko, DS Bailey, NH Brook, JE Cole, GP Heath, T Namsoo, S Robins, M Capua, A Mastroberardino, M Schioppa, G Susinno, E Tassi, JY Kim, KJ Ma, M Helbich, Y Ning, Z Ren, WB Schmidke, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, K Olkiewicz, P Stopa, D Szuba, L Zawiejski, L Adamczyk, T Bold, I Grabowska-Bold, D Kisielewska, AM Kowal, J Lukasik, M Przybycien, L Suszycki, J Szuba, A Kotanski, W Slominski, V Adler, U Behrens, I Bloch, K Borras, G Drews, J Fourletova, A Geiser, D Gladkov, P Göttlicher, O Gutsche, T Haas, W Hain, C Horn, B Kahle, U Kötz, H Kowalski, G Kramberger, D Lelas, H Lim, B Löhr, R Mankel, IA Melzer-Pellmann, CN Nguyen, D Notz, AE Nuncio-Quiroz, A Raval, R Santamarta, U Schneekloth, U Stösslein, G Wolf, C Youngman, W Zeuner, S Schlenstedt, G Barbagli, E Gallo, C Genta, PG Pelfer, A Bamberger, A Benen, E Karstens, D Dobur, NN Vlasov, PJ Bussey, AT Doyle, J Ferrando, J Hamilton, S Hanlon, DH Saxon, IO Skillicorn, I Gialas, T Carli, T Gosau, U Holm, N Krumnack, E Lohrmann, M Milite, H Salehi, P Schleper, T Schörner-Sadenius, S Stonjek, K Wichmann, K Wick, A Ziegler, A Ziegler, C Collins-Tooth, C Foudas, C Fry, R Gonçalo, KR Long, AD Tapper, M Kataoka, K Nagano, K Tokushuku, S Yamada, Y Yamazaki, AN Barakbaev, EG Boos, NS Pokrovskiy, BO Zhautykov, D Son, J de Favereau, K Piotrzkowski, F Barreiro, C Glasman, O González, M Jimenez, L Labarga, J del Peso, J Terrón, M Zambrana, M Barbi, F Corriveau, C Liu, S Padhi, M Plamondon, DG Stairs, R Walsh, C Zhou, T Tsurugai, A Antonov, P Danilov, BA Dolgoshein, V Sosnovtsev, A Stifutkin, S Suchkov, RK Dementiev, PF Ermolov, LK Gladilin, II Katkov, LA Khein, IA Korzhavina, VA Kuzmin, BB Levchenko, OY Lukina, AS Proskuryakov, LM Shcheglova, DS Zotkin, SA Zotkin, I Abt, C Büttner, A Caldwell, X Liu, J Sutiak, N Coppola, G Grigorescu, S Grijpink, A Keramidas, E Koffeman, P Kooijman, E Maddox, A Pellegrino, S Schagen, H Tiecke, M Vázquez, L Wiggers, E de Wolf, N Brümmer, B Bylsma, LS Durkin, TY Ling, PD Allfrey, MA Bell, AM Cooper-Sarkar, A Cottrell, RCE Devenish, B Foster, G Grzelak, C Gwenlan, T Kohno, S Patel, PB Straub, R Walczak, P Bellan, A Bertolin, R Brugnera, R Carlin, R Ciesielski, F Dal Corso, S Dusini, A Garfagnini, S Limentani, A Longhin, L Stanco, M Turcato, EA Heaphy, F Metlica, BY Oh, JJ Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, JC Hart, H Abramowicz, A Gabareen, S Kananov, A Kreisel, A Levy, M Kuze, S Kagawa, T Tawara, R Hamatsu, H Kaji, S Kitamura, K Matsuzawa, O Ota, YD Ri, M Costa, MI Ferrero, V Monaco, R Sacchi, A Solano, M Arneodo, M Ruspa, S Fourletov, T Koop, JF Martin, A Mirea, JM Butterworth, R Hall-Wilton, TW Jones, JH Loizides, MR Sutton, C Targett-Adams, M Wing, J Ciborowski, P Kulinski, P Luzniak, J Malka, RJ Nowak, JM Pawlak, J Sztuk, T Tymieniecka, A Tyszkiewicz, A Ukleja, J Ukleja, AF Zarnecki, M Adamus, P Plucinski, Y Eisenberg, D Hochman, U Karshon, MS Lightwood, A Everett, D Kçira, S Lammers, L Li, DD Reeder, M Rosin, P Ryan, AA Savin, WH Smith, S Dhawan, S Bhadra, CD Catterall, Y Cui, G Hartner, S Menary, U Noor, M Soares, J Standage, J Whyte
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