Measurement of D ∗± meson production and determination of $F_{2}^{c\bar{c}}$ at low Q 2 in deep-inelastic scattering at HERA

Aaron, F. D.; Alexa, C.; Andreev, V.; Backović, S.; Baghdasaryan, A.; Baghdasaryan, S.; Barrelet, E.; Bartel, W.; Begzsuren, K.; Belousov, A.; Belov, Pavel A.; Bizot, J.C.; Boenig, M.-O.; Boudry, V.; Božović-Jelisavc̆ić, I.; Braciník, J.; Brandt, G.; Brinkmann, Martin; Brisson, V.; Britzger, D.; Bruncko, D.; Bunyatyan, A.; Buschhorn, G.; Bystritskaya, L.; Campbell, A. J.; Avila, K. B. Cantun; Ceccopieri, Federico Alberto; C̆erný, K.; Černý, V.; Chekelian, V.; Contreras, J. G.; Coughlan, J. A.; Cvach, J.; Dainton, J. B.; Daum, K.; Delcourt, B.; Delvax, J.; Wolf, E. A. De; Diaconu, C.; Dobre, M.; Dodonov, V.; Dossanov, A.; Dubak, A.; Eckerlin, G.; Egli, S.; Eliseev, A.; Elsen, E.; Favart, L.; Fedotov, A.; Felst, R.; Feltesse, J.; Ferencei, J.; Fischer, D.; Fleischer, M.; Fomenko, A.; Gabathuler, E.; Gayler, J.; Ghazaryan, S.; Glazov, A.; Goerlich, L.; Gogitidze, N.; Gouzevitch, M.; Grab, C.; Grebenyuk, A.; Greenshaw, T.; Grell, B. R.; Grindhammer, G.; Habib, S.; Haidt, D.; Helebrant, C.; Henderson, R. C. W.; Hennekemper, E.; Henschel, H.; Herbst, M.; Herrera, G.; Hildebrandt, M.; Hiller, K. H.; Hoffmann, D.; Horisberger, R.; Hreus, T.; Huber, Florian; Jacquet, M.; Janssen, X.; Jönsson, L.; Jung, A. W.; Jung, H.; Kapichine, M.; Kenyon, I. R.; Kiesling, C.; Klein, M.; Kleinwort, C.; Kluge, T.; Kogler, R.; Kostka, P.; Kraemer, M.; Kretzschmar, J.; Krueger, K.; Landon, M. P. J.; Lange, W.; Laštovička-Medin, G.; Laycock, P.; Lebedev, A.; Lendermann, V.; Levonian, S.; Lipka, K.; List, B.; List, Jenny; López-Fernández, R.; Lubimov, V.; Makankine, A.; Malinovski, E.; Marage, P.; Martyn, H. U.; Maxfield, S. J.; Mehta, A.; Meyer, Andreas Bernhard; Meyer, H.; Meyer, J.; Mikocki, S.; Milcewicz-Mika, I.; Moreau, F.; Morozov, A.; Morris, J. V.; Mudrinic, M.; Mueller, K.; Naumann, T.; Newman, P. R.; Niebuhr, C.; Nikitin, D.; Nowak, G.; Nowak, K.; Olsson, J. E.; Ozerov, D.; Pahl, P.; Palichik, V.; Panagoulias, I.; Pandurović, M.; Papadopoulou, Th. D.; Pascaud, C.; Patel, G. D.; Pérez, E.; Petrukhin, A.; Pićurić, I.; Piec, S. M.; Pirumov, H.; Pitzl, D.; Plačakytė, R.; Pokorny, B.; Polifka, R.; Povh, Bogdan; Radescu, V.; Raičević, N.; Ravdandorj, T.; Reimer, P.; Rizvi, E.; Robmann, P.; Roosen, R.; Rostovtsev, A.; Rotaru, M.; Tabasco, J. E. Ruiz; Rusakov, S. V.; Šálek, D.; Sankey, D. P. C.; Sauter, M.; Sauvan, E.; Schmitt, S.; Schoeffel, L.; Schoening, A.; Schultz‐Coulon, H.‐C.; Sefkow, F.; Shtarkov, L. N.; Shushkevich, S.; Sloan, T.; Smiljanić, I.; Soloviev, Y.; Sopicki, P.; South, D.; Spaskov, V.; Specka, A.; Staykova, Z.; Steder, M.; Stella, B.; Stoicea, G.; Straumann, U.; Sýkora, T.; Thompson, P. D.; Toll, T.; Tran, T. H.; Traynor, D.; Truoel, P.; Tsakov, I.; Tseepeldorj, B.; Turnau, J.; Urban, K.; Valkárová, A.; Vallée, C.; Mechelen, P. Van; Vazdik, Y.; Wegener, D.; Wuensch, E.; Žáček, J.; Zálešâk, J.; Zhang, Zhiqing Philippe; Zhokin, A.; Zohrabyan, H.; Zomer, F.

doi:10.1140/epjc/s10052-011-1769-0

Cited by 48 publications

(39 citation statements)

References 66 publications

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“…6 This reveals itself in the p T -distribution where for the FFNS the quark and antiquark appear back to back in the Breit frame. The heavy-flavour data from HERA [76,77] clearly prefer the p T -spectrum predicted by the FFNS production mechanism (see Fig. 13 in Sect.…”

Section: Calculations In Vfnsmentioning

confidence: 89%

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Charm production and QCD analysis at HERA and LHC

Zenaiev

2017

Eur. Phys. J. C

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This review is devoted to the study of charm production in ep and pp collisions. The total set of measurements obtained by the two collaborations H1 and ZEUS from HERA and their combination is outlined, as well as complementary data obtained by the LHCb Collaboration at the LHC. After fitting the parton distribution functions the charm-production cross sections are predicted within perturbative QCD at next-to-leading order using the fixed-flavournumber scheme. Agreement with the data is found. The combined HERA charm data are sensitive to the c-quark mass and enabled its accurate determination. The predictions crucially depend upon the knowledge of the gluon distribution function. It is shown that the shape of the gluon distribution based on the HERA data is considerably improved by adding the measurements from LHCb and applicable down to values x of about 10 −6 , where x is the proton momentum fraction carried by a parton.

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Section: Calculations In Vfnsmentioning

confidence: 89%

“…Both the H1 and the ZEUS Collaborations have measured the production of D * + mesons using the "golden" decay channel using the HERA-I and HERA-II data [36,76,77,168,169,172] (see Table 1). The best phase-space coverage was achieved in the HERA-II H1 measurement [77]:…”

Section: Reconstruction Of Dmentioning

confidence: 99%

Charm production and QCD analysis at HERA and LHC

Zenaiev

2017

Eur. Phys. J. C

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“…The total uncertainties of the measurements were calculated from the statistical and systematic uncertainties of the measured cross sections (tables 6, 7, 12-15) and of the extrapolation uncertainty (tables [16][17][18][19], added in quadrature.…”

Section: Cross Sectionsmentioning

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%

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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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Measurement of D ± production in deep inelastic ep scattering with the ZEUS detector at HERA

Abramowicz¹,

Abt²,

Adamczyk³

et al. 2013

J. High Energ. Phys.

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Charm production in deep inelastic ep scattering was measured with the ZEUS detector using an integrated luminosity of 354 pb −1 . Charm quarks were identified by reconstructing D ± mesons in the D ± → K ∓ π ± π ± decay channel. Lifetime information was used to reduce combinatorial background substantially. Differential cross sections were measured in the kinematic region 5 < Q 2 < 1000 GeV 2 , 0.02 < y < 0.7, 1.5 < p T (D ± ) < 15 GeV and |η(D ± )| < 1.6, where Q 2 is the photon virtuality, y is the inelasticity, and p T (D ± ) and η(D ± ) are the transverse momentum and the pseudorapidity of the D ± meson, respectively. Next-to-leading-order QCD predictions are compared to the data. The charm contribution, F cc 2 , to the proton structure-function F 2 was extracted.

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Measurement of D ∗± meson production and determination of $F_{2}^{c\bar{c}}$ at low Q 2 in deep-inelastic scattering at HERA

Cited by 48 publications

References 66 publications

Charm production and QCD analysis at HERA and LHC

Charm production and QCD analysis at HERA and LHC

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

Measurement of D ± production in deep inelastic ep scattering with the ZEUS detector at HERA

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