Laser-plasma accelerator group

Research group

Research theme

Sub department

About

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
More details from the publisher

GeV laser-plasma electron acceleration in a cm-scale capillary waveguide

Optica Publishing Group (2006) jthb1

Authors:

Kei Nakamura, Csaba Tóth, Bob Nagler, Cameron GR Geddes, Carl B Schroeder, Eric Esarey, Wim P Leemans, Anthony J Gonsalves, Simon M Hooker
More details from the publisher

Laser-driven particle accelerators: new sources of energetic particles and radiation - Introduction

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES 364:1840 (2006) 553-557

Authors:

SM Hooker, DA Jaroszynski, K Burnett
More details from the publisher

Search for lepton-flavor violation at HERA

European Physical Journal C 44:4 (2005) 463-479

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 Slomiński, 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:

A search for lepton-flavor-violating interactions ep → μX and ep → τX has been performed with the ZEUS detector using the entire HERA I data sample, corresponding to an integrated luminosity of 130 pb-1. The data were taken at center-of-mass energies, √s, of 300 and 318 GeV. No evidence of lepton-flavor violation was found, and constraints were derived on leptoquarks (LQs) that could mediate such interactions. For LQ masses below √s, limits were set on λeq1 √β ℓq, where λeq1 is the coupling of the LQ to an electron and a first-generation quark q1, and βℓq is the branching ratio of the LQ to the final-state lepton ℓ (μ or τ) and a quark q. For LQ masses much larger than √s, limits were set on the four-fermion interaction term λeqαλ ℓqβ/MLQ2 for LQs that couple to an electron and a quark qalpha and to a lepton ℓ and a quark q beta, where α and β are quark generation indices. Some of the limits are also applicable to lepton-flavor-violating processes mediated by squarks in R-Parity-violating supersymmetric models. In some cases, especially when a higher-generation quark is involved and for the process ep → τX, the ZEUS limits are the most stringent to date. © Springer-Verlag.
More details from the publisher
More details

Multijet production in neutral current deep inelastic scattering at HERA and determination of αs

European Physical Journal C 44:2 (2005) 183-193

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 Slomiński, 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:

Multijet production rates in neutral current deep inelastic scattering have been measured in the range of exchanged boson virtualities 10 < Q 2 < 5000 GeV2. The data were taken at the ep collider HERA with centre-of-mass energy √s = 318 GeV using the ZEUS detector and correspond to an integrated luminosity of 82.2pb-1. Jets were identified in the Breit frame using the kT cluster algorithm in the longitudinally invariant inclusive mode. Measurements of differential dijet and trijet cross sections are presented as functions of jet transverse energy (ET,Bjet), pseudorapidity (ηLABjet) and Q2 with ET,Bjet > 5 GeV and -1 < ηLABjet < 2.5. Next-to-leading-order QCD calculations describe the data well. The value of the strong coupling constant αs(MZ), determined from the ratio of the trijet to dijet cross sections, is αs(MZ) = 0.1179 ± 0.0013 (stat.)-0.0046-0.0028 (exp.) -0.0046+0.0064 (th.). © Springer-Verlag / Società Italiana di Fisica 2005.
More details from the publisher
More details