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Three- and four-jet final states in photoproduction at HERA

Nuclear Physics B 792:1-2 (2008) 1-47

Authors:

S Chekanov, M Derrick, S Magill, B Musgrave, D Nicholass, J Repond, R Yoshida, MCK Mattingly, M Jechow, 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, G Sartorelli, A Zichichi, D Bartsch, I Brock, H Hartmann, E Hilger, HP Jakob, M Jüngst, OM Kind, AE Nuncio-Quiroz, E Paul, R Renner, U Samson, V Schönberg, R Shehzadi, M Wlasenko, NH Brook, GP Heath, JD Morris, 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, 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, C Blohm, A Bonato, K Borras, R Ciesielski, N Coppola, A Dossanov, V Drugakov, J Fourletova, A Geiser, D Gladkov, P Göttlicher, J Grebenyuk, I Gregor, T Haas, W Hain, C Horn, A Hüttmann, B Kahle

Abstract:

Three- and four-jet final states have been measured in photoproduction at HERA using the ZEUS detector with an integrated luminosity of 121   pb -1. The results are presented for jets with transverse energy E Tjet > 6   GeV and pseudorapidity | η jet | < 2.4, in the kinematic region given by the virtuality of the photon Q 2 < 1   GeV 2 and the inelasticity 0.2 ≤ y ≤ 0.85 and in two mass regions defined as 25 ≤ M n j < 50   GeV and M n j ≥ 50   GeV, where M n j is the invariant mass of the n-jet system. The four-jet photoproduction cross section has been measured for the first time and represents the highest-order process studied at HERA. Both the three- and four-jet cross sections have been compared with leading-logarithmic parton-shower Monte Carlo models, with and without multi-parton interactions. The three-jet cross sections have been compared to an O (α α s2) perturbative QCD calculation. © 2007 Elsevier B.V. All rights reserved.
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ATF extraction line laser-wire system

Particle Accelerator Conference 2007: Particle Accelerator Conference, 2007. PAC. IEEE (2008)

Authors:

L Deacon, ST Boogert, GA Blair, G Boorman, A Bosco, P Karataev, Laura Corner, N Delerue, B Foster, F Gannaway, D Howell, M Newman, Armin Reichold, R Senanayake, R Walczak, A Aryshev, H Hayano, K Kubo, N Terunuma, U Urakawa

Abstract:

The ATF extraction line laser-wire (LW) aims to achieve a micron-scale laser spot size and to verify that micron scale beam profile measurements can be performed at the International Linear Collider beam delivery system. Recent upgrades to the LW system are presented together with recent results including the first use of the LW as a beam diagnostic tool.
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First a tragedy, then farce

Physics World 21:9 (2008) 14-15
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Measurement of isolated photon production in deep-inelastic scattering at HERA

European Physical Journal C 54:3 (2008) 371-387

Authors:

FD Aaron, A Aktas, C Alexa, V Andreev, B Antunovic, S Aplin, A Asmone, A Astvatsatourov, S Backovic, A Baghdasaryan, P Baranov, E Barrelet, W Bartel, S Baudrand, M Beckingham, K Begzsuren, O Behnke, O Behrendt, A Belousov, N Berger, JC Bizot, MO Boenig, V Boudry, I Bozovic-Jelisavcic, J Bracinik, G Brandt, M Brinkmann, V Brisson, D Bruncko, FW Büsser, A Bunyatyan, G Buschhorn, L Bystritskaya, AJ Campbell, KB Cantun Avila, F Cassol-Brunner, K Cerny, V Cerny, V Chekelian, A Cholewa, JG Contreras, JA Coughlan, G Cozzika, J Cvach, JB Dainton, K Daum, M Deak, Y De Boer, B Delcourt, M Del Degan, J Delvax, A De Roeck, EA De Wolf, C Diaconu, V Dodonov, A Dubak, G Eckerlin, V Efremenko, S Egli, R Eichler, F Eisele, A Eliseev, E Elsen, S Essenov, A Falkiewicz, PJW Faulkner, L Favart, A Fedotov, R Felst, J Feltesse, J Ferencei, L Finke, M Fleischer, A Fomenko, G Franke, T Frisson, E Gabathuler, J Gayler, S Ghazaryan, S Ginzburgskaya, A Glazov, I Glushkov, L Goerlich, M Goettlich, N Gogitidze, S Gorbounov, M Gouzevitch, C Grab, T Greenshaw, BR Grell, G Grindhammer, S Habib, D Haidt, M Hansson, G Heinzelmann, C Helebrant, RCW Henderson, H Henschel, G Herrera, M Hildebrandt

Abstract:

The production of isolated photons in deep-inelastic scattering ep→eγX is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared 450 GeV. The analysis is based on a total integrated luminosity of 227 pb-1. The production cross section of isolated photons with a transverse energy in the range 3
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Micron size laser-wire system at the ATF extraction line

EPAC 2008 - Contributions to the Proceedings (2008) 1065-1067

Authors:

A Aryshev, GA Blair, ST Boogert, G Boorman, A Bosco, L Deacon, P Karataev, D Howell, LJ Nevay, L Corner, N Delerue, B Foster, F Gannaway, M Newman, R Senanayake, R Walczak, H Hayano, N Terunuma, J Urakawa

Abstract:

The KEK Accelerator test facility (ATF) extraction line laser-wire system has recently been upgraded allowing the measurement of micron scale transverse size electron beams. We report on the hardware upgrades, including focusing lens, laser diagnostics and mechanical systems. The first measurements using the new system from recent operation at the ATF are presented.