Measurement of charm and beauty production in deep inelastic ep scattering from decays into muons at HERA

Chekanov, S.; Derrick, M.; Magill, S.; Musgrave, B.; Nicholass, D.; Repond, J.; Yoshida, R.; Mattingly, M.C.K.; Antonioli, P.; Bari, G.; Bellagamba, L.; Boscherini, D.; Bruni, A.; Bruni, G.; Cindolo, F.; Corradi, M.; Iacobucci, G.; Margotti, A.; Nania, R.; Polini, A.; Antonelli, S.; Basile, M.; Bindi, M.; Cifarelli, L.; Contin, A.; Pasquale, S. De; Sartorelli, G.; Zichichi, A.; Bartsch, D.; Brock, I.; Hartmann, H.; Hilger, E.; Jakob, H.‐P.; Jüngst, M.; Nuncio-Quiroz, A. E.; Paul, E.; Samson, U.; Schönberg, V.; Shehzadi, R.; Wlasenko, M.; Brook, N. H.; Heath, G. P.; Morris, J. D.; Kaur, M.; Kaur, P.; Singh, Inderpal; Capua, M.; Fazio, S.; Mastroberardino, A.; Schioppa, M.; Susinno, G.; Tassi, E.; Kim, J. Y.; Ibrahim, Z. A.; Idris, F. Mohamad; Kamaluddin, B.; Abdullah, Wan Ahmad Tajuddin Wan; Ye, Ning; Ren, Z.; Sciulli, F.; Chwastowski, J. J.; Eskreys, A.; Figiel, J.; Galas, A.; Olkiewicz, K.; Pawlik, B.; Stopa, P.; Zawiejski, L.; Adamczyk, L.; Bołd, T.; Grabowska-Bołd, I.; Kisielewska, D.; Łukasik, J.; Przybycień, M.; Suszycki, L.; Kotański, A.; Słomiński, W.; Behnke, O.; Behr, J.; Behrens, U.; Blohm, C.; Borras, K.; Bot, D.; Ciesielski, R.; Coppola, N.; Fang, S. S.; Geiser, A.; Göttlicher, P.; Grebenyuk, J.; Gregor, I. M.; Haas, T.; Hain, W.; Hüttmann, A.; Januschek, F.; Kahle, B.; Katkov, I.; Klein, U.; Kötz, U.; Kowalski, H.; Lisovyi, M.; Lobodzinska, E.; Löhr, B.; Mankel, R.; Melzer-Pellmann, I.-A.; Miglioranzi, S.; Montanari, A.; Namsoo, T.; Notz, D.; Parenti, A.; Roloff, P.; Rubinsky, I.; Schneekloth, U.; Спиридонов, А.; Szuba, D.; Szuba, J.; Theedt, T.; Tomaszewska, J.; Wolf, G.; Wrona, K.; Yagües-Molina, A. G.; Youngman, C.; Zeuner, Wolfram Dietrich; Drugakov, V.; Lohmann, W.; Schlenstedt, S.; Barbagli, G.; Gallo, E.; Pelfer, P. G.; Bamberger, A.; Dobur, D.; Karstens, F.; Vlasov, N.; Bussey, P.; Doyle, A. T.; Forrest, M.; Saxon, D. H.; Skillicorn, I. O.; Gialas, I.; Papageorgiu, K.; Holm, U.; Klanner, R.; Lohrmann, E.; Perrey, H.; Schleper, P.; Schörner-Sadenius, T.; Sztuk, J.; Stadie, H.; Turcato, M.; Foudas, C.; Fry, C. A.; Long, K.; Tapper, A.; Matsumoto, T.; Nagano, K.; Tokushuku, K.; Yamada, S.; Yamazaki, Y.; Barakbaev, A. N.; Boos, E.; Pokrovskiy, N. S.; Zhautykov, B.O.; Aushev, V.; Bachynska, O.; Borodin, M.; Каденко, І.; Kuprash, O.; Libov, V.; Lontkovskyi, D.; Makarenko, I.; Sorokin, Iu.; Verbytskyi, A.; Volynets, O.; Zolko, M.; Son, D. C.; Favereau, J. de; Piotrzkowski, K.; Barreiro, F.; Glasman, C.; Jiménez, M.; Peso, J. Del; Ron, E.; Terrón, J.; Uribe-Estrada, C.; Corriveau, F.; Schwartz, J.; Zhou, C.; Tsurugai, T.; Антонов, А.; Dolgoshein, B. A.; Gladkov, D.; Sosnovtsev, V.; Stifutkin, A.; Suchkov, S.; Dementiev, R. K.; Ermolov, P.; Gladilin, L. K.; Golubkov, Yu. A.; Khein, L. A.; Korzhavina, I. A.; Kuzmin, V. A.; Levchenko, B. B.; Lukina, O. Yu.; Proskuryakov, A.S.; Shcheglova, L.M.; Zotkin, D.S.; Abt, I.; Caldwell, A.; Kollár, D.; Reisert, B.; Schmidke, W. B.; Grigorescu, G.; Keramidas, A.; Koffeman, E.; Kooijman, P.; Pellegrino, A.; Tiecke, H.; Vázquez, M.; Wiggers, L.; Brümmer, N.; Bylsma, B.; Durkin, L. S.; Lee, A.; Ling, T. Y.; Allfrey, P.; Bell, M. A.; Cooper-Sarkar, A. M.; Devenish, R. C. E.; Ferrando, J.; Foster, B.; Gwenlan, C.; Horton, K.; Oliver, K.; Robertson, A. I.; Walczak, R.; Bertolin, A.; Corso, F. Dal; Dusini, S.; Longhin, A.; Stančo, L.; Brugnera, R.; Carlin, R.; Garfagnini, A.; Limentani, S.; Oh, B.Y.; Raval, A.; Whitmore, J. J.; Iga, Y.; D’Agostini, G.; Marini, G.; Nigro, A.; Cole, J. E.; Hart, J. C.; Abramowicz, H.; Ingbir, R.; Kananov, S.; Levy, A.; Stern, A.; Kuze, M.; Maeda, J.; Hori, R.; Kagawa, S.; Okazaki, N.; Shimizu, S.; Tawara, T.; Hamatsu, R.; Kaji, Hiroshi; Kitamura, S.; Ota, O.; Ri, Y.D.; Costa, M.; Ferrero, M. I.; Monaco, V.; Sacchi, R.; Sola, V.; Solano, A.; Arneodo, M.; Ruspa, M.; Fourletov, S.; Martin, J. F.; Stewart, T. P.; Boutle, S.; Butterworth, J. M.; Jones, T. W.; Loizides, J. H.; Wing, M.; Brzozowska, B.; Ciborowski, J.; Grzelak, G.; Kulinski, P.; Łużniak, P.; Malka, J.; Nowak, R. J.; Pawlak, J. M.; Perlański, W.; Żarnecki, Aleksander Filip; Adamus, M.; Pluciński, P.; Eisenberg, Y.; Hochman, D.; Karshon, U.; Brownson, E.; Reeder, D.D.; Savin, A.; Smith, W. H.; Wolfe, H.; Bhadra, S.; Catterall, C. D.; Cui, Yanou; Hartner, G.; Menary, S.; Noor, U.; Standage, J.; Whyte, J.

doi:10.1140/epjc/s10052-009-1193-x

Cited by 47 publications

(65 citation statements)

References 55 publications

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“…The solid line shows the Hvqdis prediction with the ZEUS-S PDF, corrected for hadronisation effects, with the uncertainties indicated by the band; the dotted line shows the same prediction using the ABKM PDF; the dashed line shows the prediction from Rapgap scaled to match the measured integrated cross sections. [29], open triangles [27], open circles [26] and filled squares [9,11,14]). The inner error bars are the statistical uncertainty while the outer error bars represent the statistical, systematic (not including the error on the integrated luminosity) and extrapolation uncertainties added in quadrature.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…For heavy-quark transverse momenta comparable to the quark mass, next-to-leading-order (NLO) QCD calculations based on the dynamical generation of the massive quarks [1][2][3][4] are expected to provide reliable predictions. Beauty and charm production in DIS has been measured using several methods by the H1 [5][6][7][8][9][10][11][12][13][14][15][16] and ZEUS [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] Inclusive jet cross sections in beauty and charm events are used in the analysis presented here to extract the heavy-quark contribution to the proton structure function F 2 with high precision, and to measure the b-quark mass. For this purpose, the long lifetimes of the weakly decaying b and c hadrons, which make the reconstruction of their decay vertices possible, as well as their large masses were exploited.…”

Section: Introductionmentioning

confidence: 99%

“…Beauty and charm production in DIS has been measured using several methods by the H1 [5][6][7][8][9][10][11][12][13][14][15][16] and ZEUS [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] collaborations. All but the two most recent measurements of…”

Section: Introductionmentioning

confidence: 99%

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

Abramowicz¹,

Abt²,

Adamczyk³

et al. 2014

J. High Energ. Phys.

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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 < Q 2 < 1000 GeV 2 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 Q 2 , Bjorken x, jet transverse 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 Q 2 . The running beauty-quark mass, m b at the scale m b , was determined from a QCD fit at next-to-leading order to HERA data for the first time and found to be m b (m b ) = 4.07 ± 0.14 (fit) +0.01 −0.07 (mod.) +0.05 −0.00 (param.) +0.08 −0.05 (theo.) GeV.Keywords: Lepton-Nucleon Scattering, QCD, Jets, B physics The ZEUS collaboration 53 IntroductionThe measurement of beauty and charm production in ep collisions at HERA is an important testing ground for perturbative Quantum Chromodynamics (pQCD), since the heavy-quark masses provide a hard scale that allows perturbative calculations to be made. At leading order, the dominant process for heavy-quark production at HERA is boson-gluon fusion (BGF). In this process, a virtual photon emitted by the incoming electron interacts with a gluon from the proton forming a heavy quark-antiquark pair. When the negative squared four-momentum of the virtual photon, Q 2 , is large compared to the proton mass, the interaction is referred to as deep inelastic scattering (DIS). For heavy-quark transverse momenta comparable to the quark mass, next-to-leading-order (NLO) QCD calculations based on the dynamical generation of the massive quarks [1][2][3][4] are expected to provide reliable predictions. Beauty and charm production in DIS has been measured using several methods by the H1 [5][6][7][8][9][10][11][12][13][14][15][16] and ZEUS [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] Inclusive jet cross sections in beauty and charm events are used in the analysis presented here to extract the heavy-quark contribution to the proton structure function F 2 with high precision, and to measure the b-quark mass. For this purpose, the long lifetimes of the weakly decaying b and c hadrons, which make the reconstruction of their decay vertices possible, as well as their large masses were exploited. Two discriminating variables, the significance of the reconstructed decay length and the invariant mass of the charged tracks associated with the decay vertex (secondary vertex), were used. This inclusive tagging method leads to a substantial increase in statistics with respect to previous ZEUS measurements.Differential cross sections as a function of Q 2 , the Bjorken scaling variable, x, jet transverse energy, E jet T , and pseudorapidit...

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Section: Acknowledgmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Abramowicz¹,

Abt²,

Adamczyk³

et al. 2014

J. High Energ. Phys.

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“…Previous measurements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] have demonstrated that charm quarks are predominantly produced by the boson-gluon-fusion process, γ g → cc, which is sensitive to the gluon distribution in the proton. 1 In this paper 'electron' is used to denote both electron and positron if not otherwise stated.…”

Section: Introductionmentioning

confidence: 99%

Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA

Abramowicz¹,

Abt²,

Adamczyk³

et al. 2013

Eur. Phys. J. C

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162

233

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Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections σ cc red for charm production are obtained in the kinematic range of photon virtuality 2.5 ≤ Q 2 ≤ 2000 GeV 2 and Bjorken scaling variable 3 · 10 −5 ≤ x ≤ 5 · 10 −2 . The combination method accounts for the correlations of the systematic uncertainties among the different data sets. The combined charm data together with the combined inclusive a e-mail: levy@alzt. deep-inelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influence of different heavy flavour schemes on the parton distribution functions. The optimal values of the charm mass as a parameter in these different schemes are obtained. The implications on the NLO predictions for W ± and Z production cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined.

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“…on F c 2 (x, Q 2 ) [129,130,131,132,133,134,135], and also including F b 2 (x, Q 2 ) [136,137]. One might consider this to be a constraint on the heavy flavour distributions.…”

Section: Heavy Flavours -Quark Massesmentioning

confidence: 99%

Structure functions

Roeck

Thorne

2011

Progress in Particle and Nuclear Physics

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Structure functions are a measure of the partonic structure of hadrons, which is important for any process which involves colliding hadrons. They are a key ingredient for deriving partons distributions in nucleons. In recent years dramatic progress has been made in the understanding of the nucleon structure and the precision of its partonic content, due to vast theoretical progress, and the availability of new high precision measurements. This review gives an overview on present structure function and related data, and on the most recent techniques used to extract parton distribution functions to describe the structure of the proton. Special attention is given to the determination of the uncertainties on the parton distributions.

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Measurement of charm and beauty production in deep inelastic ep scattering from decays into muons at HERA

Cited by 47 publications

References 55 publications

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

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

Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA

Structure functions

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