Prof Roman Walczak: Publications

Measurement of neutral current cross sections at high Bjorken-x with the ZEUS detector at HERA

European Physical Journal C 49:2 (2007) 523-544

Authors:

S Chekanov, M Derrick, S Magill, S Miglioranzi, B Musgrave, D Nicholass, J Repond, R Yoshida, MCK Mattingly, N Pavel, AGY 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, 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, U Kötz

Abstract:

A new method is employed to measure the neutral current cross section up to Bjorken-x values of one with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb-1 for e+p collisions and 16.7 pb-1 for e-p collisions at √s = 318 GeV and 38.6 pb-1 for e+p collisions at √s = 300 GeV. Cross sections have been extracted for Q2 ≥648 GeV2 and are compared to predictions using different parton density functions. For the highest x bins, the data have a tendency to lie above the expectations using recent parton density function parametrizations. © Springer-Verlag Berlin Heidelberg 2007.

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Measurement of prompt photons with associated jets in photoproduction at HERA

European Physical Journal C 49:2 (2007) 511-522

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, 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, U Kötz

Abstract:

The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb-1. Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential γ+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and xγobs, the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the kT-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the kT- factorisation calculations are in good agreement with the data. © Springer-Verlag Berlin Heidelberg 2007.

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Search for stop production in R-parity-violating supersymmetry at HERA

European Physical Journal C 50:2 (2007) 269-281

Authors:

S Chekanov, M Derrick, S Magill, S Miglioranzi, B Musgrave, D Nicholass, J Repond, R Yoshida, MCK Mattingly, N Pavel, AGY 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, WATW 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 Bold, I Grabowska-Bold, D Kisielewska, J Lukasik, M Przybycien, L Suszycki, A Kotanski, W Slominski, V Adler, U Behrens, I Bloch, A Bonato, K Borras, N Coppola, J Fourletova, A Geiser, D Gladkov, P Göttlicher, I Gregor, T Haas, W Hain, C Horn, B Kahle, U Kötz, H Kowalski

Abstract:

A search for stop production in R-parity-violating supersymmetry has been performed in e+p interactions with the ZEUS detector at HERA, using an integrated luminosity of 65 pb-1. At HERA, the R-parity-violating coupling λ' allows resonant squark production, e+d→̃ q. Since the lowest-mass squark state in most supersymmetry models is the light stop, ̃t, this search concentrated on production of ̃t, followed either by a direct R-parity-violating decay, or by the gauge decay to b̃x1+. No evidence for stop production was found and limits were set on λ'131 as a function of the stop mass in the framework of the minimal supersymmetric standard model. The results have also been interpreted in terms of constraints on the parameters of the minimal supergravity model. © Springer-Verlag Berlin Heidelberg 2007.

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Bose-Einstein correlations of charged and neutral kaons in deep inelastic scattering at HERA

PHYSICS LETTERS B 652:1 (2007) 1-12

Authors:

MCK Mattingly, M Jechow, N Pavel, AG Yaguees 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, S Goers, H Hartmann, E Hilger, H-P Jakob, M Juengst, OM Kind, AE Nuncio-Quiroz, E Paul, R Renner, U Samson, V Schoenberg, R Shehzadi, 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, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, M Gil, K Olkiewicz, P Stopa, L Zawiejski, L Adamczyk, T Bold, I Grabowska-Bold, D Kisielewska, J Lukasik, M Przybycien, L Suszycki, A Kotanski, W Slominski, 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 Goettlicher, J Grebenyuk, I Gregor, T Haas, W Hain, C Horn, A Huettmann, B Kahle, II Katkov, U Klein, U Koetz, H Kowalski, E Lobodzinska, B Loehr, R Mankel, I-A Melzer-Pellmann, S Miglioranzi, A Montanari, D Notz, L Rinaldi, P Roloff, I Rubinsky, R Santamarta, U Schneekloth, A Spiridonov, H Stadie, D Szuba, J Szuba, T Theedt, G Wolf, K Wrona, C Youngman, W Zeuner, W Lohmann, S Schlenstedt, G Barbagli, E Gallo, PG Pelfer, A Bamberger, D Dobur, F Karstens, NN Vlasov, PJ Bussey, AT Doyle, W Dunne, J Ferrando, M Forrest, DH Saxon, IO Skillicorn, I Gialas, K Papageorgiu, T Gosau, U Holm, R Klanner, E Lohrmann, H Salehi, P Schleper, T Schoerner-Sadenius, J Sztuk, K Wichmann, K Wick, C Foudas, C Fry, KR Long, AD Tapper, M Kataoka, T Matsumoto, K Nagano, K Tokushuku, S Yamada, Y Yamazaki, AN Barakbaev, EG Boos, NS Pokrovskiy, BO Zhautykov, V Aushev, D Son, J de Favereau, K Piotrzkowski, F Barreiro, C Glasman, M Jimenez, L Labarga, J del Peso, E Ron, M Soares, J Terron, M Zambrana, F Corriveau, C Liu, R Walsh, C Zhou, T Tsurugai, A Antonov, BA Dolgoshein, V Sosnovtsev, A Stifutkin, S Suchkov, RK Dementiev, PF Ermolov, LK Gladilin, LA Khein, IA Korzhavina, VA Kuzmin, BB Levchenko, O Yu Lukina, AS Proskuryakov, LM Shcheglova, DS Zotkin, SA Zotkin, I Abt, C Buettner, A Caldwell, D Kollar, WB Schmidke, J Sutiak, G Grigorescu, A Keramidas, E Koffeman, P Kooijman, A Pellegrino, H Tiecke, M Vazquez, L Wiggers, N Bruemmer, B Bylsma, LS Durkin, A Lee, TY Ling, PD Allfrey, MA Bell, AM Cooper-Sarkar, A Cottrell, RCE Devenish, B Foster, K Korcsak-Gorzo, S Patel, V Roberfroid, A Robertson, PB Straub, C Uribe-Estrada, R Walczak, P Bellan, A Bertolin, R Brugnera, R Carlin, F Dal Corso, S Dusini, A Garfagnini, S Limentani, A Longhin, L Stanco, M Turcato, BY Oh, A Raval, J Ukleja, JJ Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, JE Cole, JC Hart, H Abramowicz, A Gabareen, R Ingbir, S Kananov, A Levy, M Kuze, J Maeda, R Hori, S Kagawa, N Okazaki, S Shimizu, T Tawara, R Hamatsu, H Kaji, S Kitamura, O Ota, YD Ri, MI Ferrero, V Monaco, R Sacchi, A Solano, M Ameodo, M Ruspa, S Fourletov, JF Martin, SK Boutle, JM Butterworth, C Gwenlan, TW Jones, JH Loizides, MR Sutton, M Wing, B Brzozowska, J Ciborowski, G Grzelak, P Kulinski, P Luzniak, J Malka, RJ Nowak, JM Pawlak, T Tymieniecka, A Ukleja, AF Zarnecki, M Adamus, P Plucinski, Y Eisenberg, I Giller, D Hochman, U Karshon, M Rosin, E Brownson, T Danielson, A Everett, D Kcira, DD Reeder, P Ryan, AA Savin, WH Smith, H Wolfe, S Bhadra, CD Catterall, Y Cui, G Hartner, S Menary, U Noor, J Standage, J Whyte

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Diffractive photoproduction of D*^± (2010) at HERA

EUROPEAN PHYSICAL JOURNAL C 51:2 (2007) 301-315

Authors:

S Chekanov, M Derrick, S Magill, B Musgrave, D Nicholass, J Repond, R Yoshida, MCK Mattingly, M Jechow, N Pavel, AG Yagues 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, S Goers, H Hartmann, E Hilger, H-P Jakob, M Juengst, OM Kind, E Paul, R Renner, U Samson, V Schoenberg, R Shehzadi, 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, F Sciulli, J Chwastowski, A Eskreys, J Figiel, A Galas, M Gil, K Olkiewicz, P Stopa, L Zawiejski, L Adamczyk, T Bold, I Grabowska-Bold, D Kisielewska, J Lukasik, M Przybycien, L Suszycki, A Kotanski, W Slominski, 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 Goettlicher, I Gregor, T Haas, W Hain, C Horn, B Kahle, II Katkov, U Klein, U Koetz, H Kowalski, E Lobodzinska, B Loehr, R Mankel, I-A Melzer-Pellmann, S Miglioranzi, A Montanari, D Notz, AE Nuncio-Quiroz, L Rinaldi, I Rubinsky, R Santamarta, U Schneekloth, A Spiridonov, H Stadie, D Szuba, J Szuba, T Theedt, G Wolf, K Wrona, C Youngman, W Zeuner, W Lohmann, S Schlenstedt, G Barbagli, E Gallo, PG Pelfer, A Bamberger, D Dobur, F Karstens, NN Vlasov, PJ Bussey, AT Doyle, W Dunne, J Ferrando, M Forrest, DH Saxon, IO Skillicorn, I Gialas, K Papageorgiu, T Gosau, U Holm, R Klanner, E Lohrmann, H Salehi, P Schleper, T Schoerner-Sadenius, J Sztuk, K Wichmann, K Wick, C Foudas, C Fry, KR Long, AD Tapper, M Kataoka, T Matsumoto, 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, M Jimenez, L Labarga, J del Peso, E Ron, M Soares, J Terron, M Zambrana, F Corriveau, C Liu, R Walsh, C Zhou, T Tsurugai, A Antonov, BA Dolgoshein, V Sosnovtsev, A Stifutkin, S Suchkov, RK Dementiev, PF Ermolov, LK Gladilin, LA Khein, IA Korzhavina, VA Kuzmin, BB Levchenko, O Yu Lukina, AS Proskuryakov, LM Shcheglova, DS Zotkin, SA Zotkin, I Abt, C Buettner, A Caldwell, D Kollar, WB Schmidke, J Sutiak, G Grigorescu, A Keramidas, EK Eman, P Kooijman, A Pellegrino, H Tiecke, M Vazquez, L Wiggers, N Bruemmer, B Bylsma, LS Durkin, A Lee, TY Ling, PD Allfrey, MA Bell, AM Cooper-Sarkar, A Cottrell, RCE Devenish, B Foster, K Korcsak-Gorzo, S Patel, V Roberfroid, A Robertson, PB Straub, C Uribe-Estrada, R Walczak, P Bellan, A Bertolin, R Brugnera, R Carlin, F Dal Corso, S Dusini, A Garfagnini, S Limentani, A Longhin, L Stanco, M Turcato, BY Oh, A Raval, J Ukleja, JJ Whitmore, Y Iga, G D'Agostini, G Marini, A Nigro, JE Cole, JC Hart, H Abramowicz, A Gabareen, R Ingbir, S Kananov, A Levy, M Kuze, J Maeda, R Hori, S Kagawa, N Okazaki, S Shimizu, T Tawara, R Hamatsu, H Kaji, S Kitamura, O Ota, YD Ri, MI Ferrero, V Monaco, R Sacchi, A Solano, M Arneodo, M Ruspa, S Fourletov, JF Martin, SK Boutle, JM Butterworth, C Gwenlan, TW Jones, JH Loizides, MR Sutton, M Wing, B Brzozowska, J Ciborowski, G Grzelak, P Kulinski, PL Zniak, J Malka, RJ Nowak, JM Pawlak, T Tymieniecka, A Ukleja, AF Zarnecki, M Adamus, P Plucinski, Y Eisenberg, I Giller, D Hochman, U Karshon, M Rosin, E Brownson, T Danielson, A Everett, D Kcira, DD Reeder, P Ryan, AA Savin, WH Smith, H Wolfe, S Bhadra, CD Catterall, Y Cui, G Hartner, S Menary, U Noor, J Standage, J Whyte

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Prof Roman Walczak

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Measurement of neutral current cross sections at high Bjorken-x with the ZEUS detector at HERA

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Abstract:

Measurement of prompt photons with associated jets in photoproduction at HERA

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Abstract:

Search for stop production in R-parity-violating supersymmetry at HERA

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Abstract:

Bose-Einstein correlations of charged and neutral kaons in deep inelastic scattering at HERA

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Diffractive photoproduction of D*^± (2010) at HERA

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Prof Roman Walczak

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Measurement of neutral current cross sections at high Bjorken-x with the ZEUS detector at HERA

Authors:

Abstract:

Measurement of prompt photons with associated jets in photoproduction at HERA

Authors:

Abstract:

Search for stop production in R-parity-violating supersymmetry at HERA

Authors:

Abstract:

Bose-Einstein correlations of charged and neutral kaons in deep inelastic scattering at HERA

Authors:

Diffractive photoproduction of D*± (2010) at HERA

Authors:

Diffractive photoproduction of D*^± (2010) at HERA