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Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass

Journal of High Energy Physics Springer Nature 2014:10 (2014) 33

Authors:

The ZEUS collaboration, H Abramowicz, I Abt, L Adamczyk, M Adamus, R Aggarwal, S Antonelli, O Arslan, V Aushev, Y Aushev, O Bachynska, AN Barakbaev, N Bartosik, O Behnke, J Behr, U Behrens, A Bertolin, S Bhadra, I Bloch, V Bokhonov, EG Boos, K Borras, I Brock, R Brugnera, A Bruni, B Brzozowska, PJ Bussey, A Caldwell, M Capua, CD Catterall, J Chwastowski, J Ciborowski, R Ciesielski, AM Cooper-Sarkar, M Corradi, F Corriveau, G D’Agostini, RK Dementiev, RCE Devenish, G Dolinska, V Drugakov, S Dusini, J Ferrando, J Figiel, B Foster, G Gach, A Garfagnini, A Geiser, A Gizhko, LK Gladilin, O Gogota, Yu A Golubkov, J Grebenyuk, I Gregor, G Grzelak, O Gueta, M Guzik, W Hain, G Hartner, D Hochman, R Hori, ZA Ibrahim, Y Iga, M Ishitsuka, A Iudin, F Januschek, I Kadenko, S Kananov, T Kanno, U Karshon, M Kaur, P Kaur, LA Khein, D Kisielewska, R Klanner, U Klein, N Kondrashova, O Kononenko, Ie Korol, IA Korzhavina, A Kotanski, U Kötz, N Kovalchuk, H Kowalski, O Kuprash, M Kuze, BB Levchenko, A Levy, V Libov, S Limentani, M Lisovyi, E Lobodzinska, W Lohmann, B Löhr, E Lohrmann, A Longhin, D Lontkovskyi, O Yu Lukina, J Maeda, I Makarenko, J Malka, JF Martin, S Mergelmeyer, F Mohamad Idris, K Mujkic, V Myronenko, K Nagano, A Nigro, T Nobe, D Notz, RJ Nowak, K Olkiewicz, Yu Onishchuk, E Paul, W Perlanski, H Perrey, NS Pokrovskiy, AS Proskuryakov, M Przybycien, A Raval, P Roloff, I Rubinsky, M Ruspa, V Samojlov, DH Saxon, M Schioppa, WB Schmidke, U Schneekloth, T Schörner-Sadenius, J Schwartz, LM Shcheglova, R Shehzadi, R Shevchenko, O Shkola, I Singh, IO Skillicorn, W Slominski, V Sola, A Solano, A Spiridonov, L Stanco, N Stefaniuk, A Stern, TP Stewart, P Stopa, J Sztuk-Dambietz, D Szuba, J Szuba, E Tassi, T Temiraliev, K Tokushuku, J Tomaszewska, A Trofymov, V Trusov, T Tsurugai, M Turcato, O Turkot, T Tymieniecka, A Verbytskyi, O Viazlo, R Walczak, WAT Wan Abdullah, K Wichmann, M Wing, G Wolf, S Yamada, Y Yamazaki, N Zakharchuk, AF Żarnecki, L Zawiejski, O Zenaiev, BO Zhautykov, N Zhmak, DS Zotkin
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Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass

Journal of High Energy Physics Springer Nature 2014:9 (2014) 127

Authors:

The ZEUS collaboration, H Abramowicz, I Abt, L Adamczyk, M Adamus, R Aggarwal, S Antonelli, O Arslan, V Aushev, Y Aushev, O Bachynska, AN Barakbaev, N Bartosik, O Behnke, J Behr, U Behrens, A Bertolin, S Bhadra, I Bloch, V Bokhonov, EG Boos, K Borras, I Brock, R Brugnera, A Bruni, B Brzozowska, PJ Bussey, A Caldwell, M Capua, CD Catterall, J Chwastowski, J Ciborowski, R Ciesielski, AM Cooper-Sarkar, M Corradi, F Corriveau, G D’Agostini, RK Dementiev, RCE Devenish, G Dolinska, V Drugakov, S Dusini, J Ferrando, J Figiel, B Foster, G Gach, A Garfagnini, A Geiser, A Gizhko, LK Gladilin, O Gogota, Yu A Golubkov, J Grebenyuk, I Gregor, G Grzelak, O Gueta, M Guzik, W Hain, G Hartner, D Hochman, R Hori, ZA Ibrahim, Y Iga, M Ishitsuka, A Iudin, F Januschek, I Kadenko, S Kananov, T Kanno, U Karshon, M Kaur, P Kaur, LA Khein, D Kisielewska, R Klanner, U Klein, N Kondrashova, O Kononenko, Ie Korol, IA Korzhavina, A Kotanski, U Kötz, N Kovalchuk, H Kowalski, O Kuprash, M Kuze, BB Levchenko, A Levy, V Libov, S Limentani, M Lisovyi, E Lobodzinska, W Lohmann, B Löhr, E Lohrmann, A Longhin, D Lontkovskyi, O Yu Lukina, J Maeda, I Makarenko, J Malka, JF Martin, S Mergelmeyer, F Mohamad Idris, K Mujkic, V Myronenko, K Nagano, A Nigro, T Nobe, D Notz, RJ Nowak, K Olkiewicz, Yu Onishchuk, E Paul, W Perlanski, H Perrey, NS Pokrovskiy, AS Proskuryakov, M Przybycien, A Raval, P Roloff, I Rubinsky, M Ruspa, V Samojlov, DH Saxon, M Schioppa, WB Schmidke, U Schneekloth, T Schörner-Sadenius, J Schwartz, LM Shcheglova, R Shehzadi, R Shevchenko, O Shkola, I Singh, IO Skillicorn, W Slominski, V Sola, A Solano, A Spiridonov, L Stanco, N Stefaniuk, A Stern, TP Stewart, P Stopa, J Sztuk-Dambietz, D Szuba, J Szuba, E Tassi, T Temiraliev, K Tokushuku, J Tomaszewska, A Trofymov, V Trusov, T Tsurugai, M Turcato, O Turkot, T Tymieniecka, A Verbytskyi, O Viazlo, R Walczak, WAT Wan Abdullah, K Wichmann, M Wing, G Wolf, S Yamada, Y Yamazaki, N Zakharchuk, AF Żarnecki, L Zawiejski, O Zenaiev, BO Zhautykov, N Zhmak, DS Zotkin

Abstract:

The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q2< 1000 GeV2 using an integrated luminosity of 354 pb−1. The beauty and charm content in events with at least one jet have been extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length significance of these vertices. Differential cross sections as a function of Q2, Bjorken x, jet trans- verse energy and pseudorapidity were measured and compared with next-to-leading-order QCD calculations. The beauty and charm contributions to the proton structure functions were extracted from the double-differential cross section as a function of x and Q2. The running beauty-quark mass, mb at the scale mb, was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be mb(mb) = 4.07 ± 0.14 (fit)− 0.07+ 0.01(mod.)− 0.00+ 0.05(param.)− 0.05+ 0.08(theo.) GeV.
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Further studies of the photoproduction of isolated photons with a jet at HERA

Journal of High Energy Physics Springer Nature 2014:8 (2014) 23

Authors:

The ZEUS collaboration, H Abramowicz, I Abt, L Adamczyk, M Adamus, R Aggarwal, S Antonelli, O Arslan, V Aushev, Y Aushev, O Bachynska, AN Barakbaev, N Bartosik, O Behnke, J Behr, U Behrens, A Bertolin, S Bhadra, I Bloch, V Bokhonov, EG Boos, K Borras, I Brock, R Brugnera, A Bruni, B Brzozowska, PJ Bussey, A Caldwell, M Capua, CD Catterall, J Chwastowski, J Ciborowski, R Ciesielski, AM Cooper-Sarkar, M Corradi, F Corriveau, G D’Agostini, RK Dementiev, RCE Devenish, G Dolinska, V Drugakov, S Dusini, J Ferrando, J Figiel, B Foster, G Gach, A Garfagnini, A Geiser, A Gizhko, LK Gladilin, O Gogota, Yu A Golubkov, J Grebenyuk, I Gregor, G Grzelak, O Gueta, M Guzik, W Hain, G Hartner, D Hochman, R Hori, ZA Ibrahim, Y Iga, M Ishitsuka, A Iudin, F Januschek, I Kadenko, S Kananov, T Kanno, U Karshon, M Kaur, P Kaur, LA Khein, D Kisielewska, R Klanner, U Klein, N Kondrashova, O Kononenko, Ie Korol, IA Korzhavina, A Kotanski, U Kötz, N Kovalchuk, H Kowalski, O Kuprash, M Kuze, BB Levchenko, A Levy, V Libov, S Limentani, M Lisovyi, E Lobodzinska, W Lohmann, B Löhr, E Lohrmann, A Longhin, D Lontkovskyi, O Yu Lukina, J Maeda, I Makarenko, J Malka, JF Martin, S Mergelmeyer, F Mohamad Idris, K Mujkic, V Myronenko, K Nagano, A Nigro, T Nobe, D Notz, RJ Nowak, K Olkiewicz, Yu Onishchuk, E Paul, W Perlanski, H Perrey, NS Pokrovskiy, AS Proskuryakov, M Przybycien, A Raval, P Roloff, I Rubinsky, M Ruspa, V Samojlov, DH Saxon, M Schioppa, WB Schmidke, U Schneekloth, T Schörner-Sadenius, J Schwartz, LM Shcheglova, R Shevchenko, O Shkola, I Singh, IO Skillicorn, W Slominski, V Sola, A Solano, A Spiridonov, L Stanco, N Stefaniuk, A Stern, TP Stewart, P Stopa, J Sztuk-Dambietz, D Szuba, J Szuba, E Tassi, T Temiraliev, K Tokushuku, J Tomaszewska, A Trofymov, V Trusov, T Tsurugai, M Turcato, O Turkot, T Tymieniecka, A Verbytskyi, O Viazlo, R Walczak, WAT Wan Abdullah, K Wichmann, M Wing, G Wolf, S Yamada, Y Yamazaki, N Zakharchuk, AF Żarnecki, L Zawiejski, O Zenaiev, BO Zhautykov, N Zhmak, DS Zotkin
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Development of a BPM system using a commercial FPGA card and digitizer adaptor module for fets

IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference (2014) 3716-3718

Authors:

G Boorman, S Gibson, S Jolly, R D'Arcy, SR Lawrie, AP Letchford

Abstract:

A series of Beam Position Monitors (BPMs) will be installed at the Front End Test Stand (FETS) at RAL as part of the 3 MeV Medium Energy Beam Transport (MEBT). The BPMs analyse 2 ms long, 60 mA beam pulses delivered to the MEBT by a 324 MHz Radio Frequency Quadrupole (RFQ). Initial linearity and resolution measurements from the prototype button BPMs are shown. The development of the algorithm for the processing of the BPM signals using a commercial PXI-based FPGA card is discussed and initial measurements of the electronics and signal processing are presented. The test-rig used to characterise each BPM and further develop the processing algorithm is described. The position and phase are measured several times throughout the duration of each pulse, and the measurements are made available via an EPICS server.

SINBAD - A proposal for a dedicated accelerator research facility at DESY

IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference (2014) 1466-1469

Authors:

R Assmann, C Behrens, R Brinkmann, U Dorda, K Flöttmann, B Foster, J Grebenyuk, M Gross, I Hartl, M Hüning, F Kärtner, B Marchetti, Y Nie, J Osterhoff, A Rühl, H Schlarb, B Schmidt, F Stephan, AS Müller, M Schuh, F Grüner, B Hidding, AR Maier, B Zeitler

Abstract:

A dedicated accelerator research and development facility SINBAD (Short INnovative Bunches and Accelerators at DESY) is proposed. This multi-purpose research facility is initially aimed at promoting three major goals: (1) Short electron bunches for ultra-fast science. (2) Construction of a plasma accelerator module with useable beam quality (3) Setup of an attosecond radiation source with advanced technology. Research and development on these topics is presently ongoing at various places at DESY, as add-on experiments at operational facilities. The two research goals are intimately connected: short bunches and precise femtosecond timing are requirements for developing a plasma accelerator module with external injection or staging. The scientific case of a dedicated facility for accelerator research at DESY is discussed. Further options are mentioned, like the use of a 1 GeV beam from Linac II for FEL studies. The presently planned conversion of the DORIS accelerator and its central halls into the SINBAD facility is described. The available space will allow setting up several independent experiments with a cost-effective use of the same infrastructure (for example a central high power laser, a central timing and synchronization lab, etc.). National and international contributions and proposals can be envisaged. A preliminary, possible layout and the design work plan are discussed.