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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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Impact of future HERA data on the determination of proton parton distribution functions using the ZEUS NLO QCD fit

Journal of Physics G Institute of Physics 32:2 (2006) 221

Authors:

Claire Gwenlan, Amanda M Cooper-Sarkar, Christopher Targett-Adams

Abstract:

The high precision and large kinematic coverage of the data from the HERA-I running period (1994-2000) have already allowed precise extractions of proton parton distribution functions. The HERA-II running program is now underway and is expected to provide a substantial increase in the luminosity collected at HERA. In this paper, a study is presented which investigates the potential impact of future data from HERA on the proton PDF uncertainties, within the currently planned running scenario. Next-to-leading order QCD predictions for inclusive jet cross sections at the LHC centre-of-mass energy are presented using the estimated PDFs. Finally, the effect of a possible future measurement of the longitudinal structure function, FL, on the gluon distribution is investigated.
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HERA and the LHC - A workshop on the implications of HERA for LHC physics: Proceedings - Part A

(2006)

Authors:

S Alekhin, G Altarelli, N Amapane, J Andersen, V Andreev, M Arneodo, V Avati, J Baines, RD Ball, A Banfi, SP Baranov, J Bartels, O Behnke, R Bellan, J Blumlein, H Bottcher, S Bolognesi, M Boonekamp, D Bourilkov, J Bracinik, A Bruni, G Bruni, A Buckley, A Bunyatyan, CM Buttar, JM Butterworth, S Butterworth, M Cacciari, T Carli, G Cerminara, S Chekanov, M Ciafaloni, D Colferai, J Collins, A Cooper-Sarkar, G Corcella, M Corradi, BE Cox, R Croft, Z Czyczula, A Dainese, M Dasgupta, G Davatz, L Del Debbio, Y Delenda, A De Roeck, M Diehl, S Diglio, G Dissertori, M Dittmar, J Ellis, KJ Eskola, TO Eynck, J Feltesse, F Ferro, RD Field, J Forshaw, S Forte, A Geiser, S Gieseke, A Glazov, T Gleisberg, P Golonka, E Gotsman, G Grindhammer, M Grothe, C Group, M Groys, A Guffanti, G Gustafson, C Gwenlan, S Hoche, C Hogg, J Huston, G Iacobucci, G Ingelman, S Jadach, H Jung, J Kalliopuska, M Kapishin, B Kersevan, V Khoze, M Klasen, M Klein, BA Kniehl, VJ Kolhinen, H Kowalski, G Kramer, F Krauss, S Kretzer, K Kutak, JW Lamsa, L Lonnblad, T Lastovicka, G Lastovicka-Medin, E Laenen, Th Lagouri, JI Latorre, N Lavesson, V Lendermann, E Levin, A Levy, AV Lipatov, M Lublinsky, L Lytkin, T Maki, L Magnea, F Maltoni, M Mangano, U Maor, C Mariotti, N Marola, AD Martin, A Meyer, S Moch, J Monk, A Moraes, A Morsch, L Motyka, E Naftali, P Newman, A Nikitenko, F Oljemark, R Orava, M Ottela, K Osterberg, K Peters, F Petrucci, A Piccione, A Pilkington, K Piotrzkowski, OI Piskounova, A Proskuryakov, A Prygarin, J Pumplin, K Rabbertz, R Ranieri, V Ravindran, B Reisert, E Richter-Was, L Rinaldi, P Robbe, E Rodrigues, J Rojo, H Ruiz, M Ruspa, MG Ryskin, A Sabio Vera, GP Salam, A Schalicke, S Schatzel, T Schorner-Sadenius, I Schienbein, F-P Schilling, S Schumann, MH Seymour, F Siegert, T Sjostrand, M Skrzypek, J Smith, M Smizanska, H Spiesberger, F Schrempp, A Stasto, H Stenzel, WJ Stirling, P Szczypka, S Tapprogge, C Targett-Adams, M Tasevsky, T Teubner, RS Thorne, A Tonazzo, A Tricoli, N Tuning, J Turnau, U Uwer, P Van Mechelen, R Venugopalan, M Verducci, JAM Vermaseren, A Vogt, R Vogt, BFL Ward, Z Was, G Watt, BM Waugh, C Weiser, MR Whalley, M Wing, J Winter, SA Yost, G Zanderighi, NP Zotov
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HERA and the LHC - A workshop on the implications of HERA for LHC physics: Proceedings - Part B

(2006)

Authors:

S Alekhin, G Altarelli, N Amapane, J Andersen, V Andreev, M Arneodo, V Avati, J Baines, RD Ball, A Banfi, SP Baranov, J Bartels, O Behnke, R Bellan, J Blumlein, H Bottcher, S Bolognesi, M Boonekamp, D Bourilkov, J Bracinik, A Bruni, G Bruni, A Buckley, A Bunyatyan, CM Buttar, JM Butterworth, S Butterworth, M Cacciari, T Carli, G Cerminara, S Chekanov, M Ciafaloni, D Colferai, J Collins, A Cooper-Sarkar, G Corcella, M Corradi, BE Cox, R Croft, Z Czyczula, A Dainese, M Dasgupta, G Davatz, L Del Debbio, Y Delenda, A De Roeck, M Diehl, S Diglio, G Dissertori, M Dittmar, J Ellis, KJ Eskola, TO Eynck, J Feltesse, F Ferro, RD Field, J Forshaw, S Forte, A Geiser, S Gieseke, A Glazov, T Gleisberg, P Golonka, E Gotsman, G Grindhammer, M Grothe, C Group, M Groys, A Guffanti, G Gustafson, C Gwenlan, S Hoche, C Hogg, J Huston, G Iacobucci, G Ingelman, S Jadach, H Jung, J Kalliopuska, M Kapishin, B Kersevan, V Khoze, M Klasen, M Klein, BA Kniehl, VJ Kolhinen, H Kowalski, G Kramer, F Krauss, S Kretzer, K Kutak, JW Lamsa, L Lonnblad, T Lastovicka, G Lastovicka-Medin, E Laenen, Th Lagouri, JI Latorre, N Lavesson, V Lendermann, E Levin, A Levy, AV Lipatov, M Lublinsky, L Lytkin, T Maki, L Magnea, F Maltoni, M Mangano, U Maor, C Mariotti, N Marola, AD Martin, A Meyer, S Moch, J Monk, A Moraes, A Morsch, L Motyka, E Naftali, P Newman, A Nikitenko, F Oljemark, R Orava, M Ottela, K Osterberg, K Peters, F Petrucci, A Piccione, A Pilkington, K Piotrzkowski, OI Piskounova, A Proskuryakov, A Prygarin, J Pumplin, K Rabbertz, R Ranieri, V Ravindran, B Reisert, E Richter-Was, L Rinaldi, P Robbe, E Rodrigues, J Rojo, H Ruiz, M Ruspa, MG Ryskin, A Sabio Vera, GP Salam, A Schalicke, S Schatzel, T Schorner-Sadenius, I Schienbein, F-P Schilling, S Schumann, MH Seymour, F Siegert, T Sjostrand, M Skrzypek, J Smith, M Smizanska, H Spiesberger, F Schrempp, A Stasto, H Stenzel, WJ Stirling, P Szczypka, S Tapprogge, C Targett-Adams, M Tasevsky, T Teubner, RS Thorne, A Tonazzo, A Tricoli, N Tuning, J Turnau, U Uwer, P Van Mechelen, R Venugopalan, M Verducci, JAM Vermaseren, A Vogt, R Vogt, BFL Ward, Z Was, G Watt, BM Waugh, C Weiser, MR Whalley, M Wing, J Winter, SA Yost, G Zanderighi, NP Zotov
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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.