Abstract
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 GeV2, 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, \( F_2^{{c\overline{c}}} \), to the proton structure-function F 2 was extracted.
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References
ZEUS collaboration, J. Breitweg et al., Measurement of D ± production and the charm contribution to F(2) in deep inelastic scattering at HERA, Eur. Phys. J. C 12 (2000) 35 [hep-ex/9908012] [INSPIRE].
ZEUS collaboration, S. Chekanov et al., Measurement of D ± production in deep inelastic e ± p scattering at HERA, Phys. Rev. D 69 (2004) 012004 [hep-ex/0308068] [INSPIRE].
ZEUS collaboration, S. Chekanov et al., Measurement of D ± and D 0 production in deep inelastic scattering using a lifetime tag at HERA, Eur. Phys. J. C 63 (2009) 171 [arXiv:0812.3775] [INSPIRE].
ZEUS collaboration, S. Chekanov et al., Measurement of charm and beauty production in deep inelastic ep scattering from decays into muons at HERA, Eur. Phys. J. C 65 (2010) 65 [arXiv:0904.3487] [INSPIRE].
ZEUS collaboration, H. Abramowicz et al., Measurement of D + and \( \Lambda_c^{+} \) production in deep inelastic scattering at HERA, JHEP 11 (2010) 009 [arXiv:1007.1945] [INSPIRE].
H1 collaboration, C. Adloff et al., Measurement of D ± meson production and \( F_2^c \) in deep inelastic scattering at HERA, Phys. Lett. B 528 (2002) 199 [hep-ex/0108039] [INSPIRE].
H1 collaboration, A. Aktas et al., Production of D ± Mesons with Dijets in Deep-Inelastic Scattering at HERA, Eur. Phys. J. C 51 (2007) 271 [hep-ex/0701023] [INSPIRE].
H1 collaboration, F. Aaron et al., Measurement of the D ± Meson Production Cross section and \( F_2^{{c\overline{c}}} \) , at High Q 2 , in ep Scattering at HERA, Phys. Lett. B 686 (2010) 91 [arXiv:0911.3989] [INSPIRE].
H1 collaboration, F. Aaron et al., Measurement of D ± Meson Production and Determination of \( F_2^{{c\overline{c}}} \) at low Q 2 in Deep-Inelastic Scattering at HERA, Eur. Phys. J. C 71 (2011) 1769 [Erratum ibid. C 72 (2012) 2252] [arXiv:1106.1028] [INSPIRE].
H1 collaboration, A. Aktas et al., Measurement of \( F_2^{{c\overline{c}}} \) and \( F_2^{{b\overline{b}}} \) at low Q 2 and x using the 2 2 H1 vertex detector at HERA, Eur. Phys. J. C 45 (2006) 23 [hep-ex/0507081] [INSPIRE].
H1 collaboration, F. Aaron et al., Measurement of the Charm and Beauty Structure Functions using the H1 Vertex Detector at HERA, Eur. Phys. J. C 65 (2010) 89 [arXiv:0907.2643] [INSPIRE].
H1 collaboration, F. Aaron et al., Measurement of Charm and Beauty Jets in Deep Inelastic Scattering at HERA, Eur. Phys. J. C 71 (2011) 1509 [arXiv:1008.1731] [INSPIRE].
H1 and ZEUS collaborations, H. Abramowicz et al., Combination and QCD Analysis of Charm Production Cross section Measurements in Deep-Inelastic ep Scattering at HERA, Eur. Phys. J. C 73 (2013) 2311 [arXiv:1211.1182] [INSPIRE].
S. Alekhin and S. Moch, Heavy-quark deep-inelastic scattering with a running mass, Phys. Lett. B 699 (2011) 345 [arXiv:1011.5790] [INSPIRE].
ZEUS collaboration, U. Holm ed., The ZEUS Detector, Status Report (unpublished), DESY (1993), available on http://www-zeus.desy.de/bluebook/bluebook.html.
N. Harnew et al., Vertex Triggering Using Time Difference Measurements in the ZEUS Central Tracking Detector, Nucl. Instrum. Meth. A 279 (1989) 290 [INSPIRE].
B. Foster et al., The performance of the ZEUS central tracking detector z-by-timing electronics in a transputer based data acquisition system, Nucl. Phys. Proc. Suppl. B 32 (1993) 181.
B. Foster et al., The design and construction of the ZEUS central tracking detector, Nucl. Instrum. Meth. A 338 (1994) 254 [INSPIRE].
A. Polini et al., The design and performance of the ZEUS Micro Vertex detector, Nucl. Instrum. Meth. A 581 (2007) 656 [arXiv:0708.3011] [INSPIRE].
M. Derrick et al., Design and construction of the ZEUS barrel calorimeter., Nucl. Instrum. Meth. A 309 (1991) 77 [INSPIRE].
A. Andresen et al., Construction and beam test of the ZEUS forward and rear calorimeter, Nucl. Instrum. Meth. A 309 (1991) 101 [INSPIRE].
A. Caldwell et al., Design and implementation of a high precision readout system for the ZEUS calorimeter, Nucl. Instrum. Meth. A 321 (1992) 356 [INSPIRE].
A. Bernstein et al., Beam tests of the ZEUS barrel calorimeter, Nucl. Instrum. Meth. A 336 (1993) 23 [INSPIRE].
J. Andruszków et al., First measurement of HERA luminosity by ZEUS lumi monitor, Preprint DESY-92-066, DESY, (1992).
ZEUS collaboration, M. Derrick et al., Measurement of total and partial photon proton cross-sections at 180-GeV center-of-mass energy, Z. Phys. C 63 (1994) 391 [INSPIRE].
J. Andruszków et al., Luminosity measurement in the ZEUS experiment, Acta Phys. Polon. B 32 (2001) 2025 [INSPIRE].
M. Helbich et al., The spectrometer system for measuring ZEUS luminosity at HERA, Nucl. Instrum. Meth. A 565 (2006) 572 [physics/0512153] [INSPIRE].
J. Smith and W. van Neerven, QCD corrections to heavy flavor photoproduction and electroproduction, Nucl. Phys. B 374 (1992) 36 [INSPIRE].
B. Harris and J. Smith, Charm quark and D ± cross-sections in deeply inelastic scattering at HERA, Phys. Rev. D 57 (1998) 2806 [hep-ph/9706334] [INSPIRE].
ZEUS collaboration, S. Chekanov et al., A ZEUS next-to-leading-order QCD analysis of data on deep inelastic scattering, Phys. Rev. D 67 (2003) 012007 [hep-ex/0208023] [INSPIRE].
V. Kartvelishvili, A. Likhoded and V. Petrov, On the Fragmentation Functions of Heavy Quarks Into Hadrons, Phys. Lett. B 78 (1978) 615 [INSPIRE].
M. Lisovyi, Measurement of charm production in deep inelastic scattering using lifetime tagging for D ± meson decays with the ZEUS detector at HERA, Ph.D. Thesis, Universität Hamburg, Report DESY-THESIS-2011-033, (2011).
ZEUS collaboration, S. Chekanov et al., Measurement of the charm fragmentation function in D* photoproduction at HERA, JHEP 04 (2009) 082 [arXiv:0901.1210] [INSPIRE].
H1 collaboration, F. Aaron et al., Study of Charm Fragmentation into D ± Mesons in Deep-Inelastic Scattering at HERA, Eur. Phys. J. C 59 (2009) 589 [arXiv:0808.1003] [INSPIRE].
M. Cacciari, P. Nason and C. Oleari, A study of heavy flavored meson fragmentation functions in e + e − annihilation, JHEP 04 (2006) 006 [hep-ph/0510032] [INSPIRE].
Belle collaboration, R. Seuster et al., Charm hadrons from fragmentation and B decays in e + e − annihilation at \( \sqrt{s}=10.6 \) GeV, Phys. Rev. D 73 (2006) 032002 [hep-ex/0506068] [INSPIRE].
CLEO collaboration, M. Artuso et al., Charm meson spectra in e + e − annihilation at 10.5 GeV c.m.e., Phys. Rev. D 70 (2004) 112001 [hep-ex/0402040] [INSPIRE].
E. Lohrmann, A Summary of Charm Hadron Production Fractions, arXiv:1112.3757 [INSPIRE].
Particle Data Group collaboration, J. Beringer et al., Review of Particle Physics (RPP), Phys. Rev. D 86 (2012) 010001 [INSPIRE].
R. Thorne and R. Roberts, An ordered analysis of heavy flavor production in deep inelastic scattering, Phys. Rev. D 57 (1998) 6871 [hep-ph/9709442] [INSPIRE].
J.C. Collins and W.-K. Tung, Calculating Heavy Quark Distributions, Nucl. Phys. B 278 (1986) 934 [INSPIRE].
H. Jung, Hard diffractive scattering in high-energy ep collisions and the Monte Carlo generator RAPGAP, Comput. Phys. Commun. 86 (1995) 147 [INSPIRE].
A. Kwiatkowski, H. Spiesberger and H. Möhring, HERACLES: an event generator for ep interactions at HERA energies including radiative processes: version 1.0, Comput. Phys. Commun. 69 (1992) 155 [INSPIRE].
CTEQ collaboration, H. Lai et al., Global QCD analysis of parton structure of the nucleon: CTEQ5 parton distributions, Eur. Phys. J. C 12 (2000) 375 [hep-ph/9903282] [INSPIRE].
M. Bowler, e + e − Production of Heavy Quarks in the String Model, Z. Phys. C 11 (1981) 169 [INSPIRE].
R. Brun et al., Geant3, CERN-DD/EE/84-1, CERN, (1987).
P.D. Allfrey et al., The design and performance of the ZEUS global tracking trigger, Nucl. Instrum. Meth. A 580 (2007) 1257 [INSPIRE].
W.H. Smith, K. Tokushuku and L.W. Wiggers, Proc. Computing in High-Energy Physics (CHEP), Annecy, France, September 1992, C. Verkerk and W. Wojcik eds., pg. 222. CERN, Geneva, Switzerland (1992), also in preprint DESY 92-150B.
S. Bentvelsen, J. Engelen and P. Kooijman, Proc. Workshop on Physics at HERA, W. Buchmüller and G. Ingelman eds., Vol. 1, pg. 23. Hamburg, Germany, DESY (1992).
G.M. Briskin, Diffractive dissociation in ep deep inelastic scattering, Ph.D. Thesis, Tel Aviv University, Report DESY-THESIS 1998-036, (1998).
ZEUS collaboration, J. Breitweg et al., Measurement of the diffractive structure function F2(D(4)) at HERA, Eur. Phys. J. C 1 (1998) 81 [hep-ex/9709021] [INSPIRE].
F. Jacquet and A. Blondel, Proceedings of the Study for an ep Facility for Europe, U. Amaldi ed., pg. 391, Hamburg, Germany (1979), Also in preprint DESY 79/48.
V. Libov and A. Spiridonov, private communication.
V. Schönberg, Measurement of beauty and charm photoproduction using inclusive secondary vertexing with the ZEUS detector at HERA, Dissertation, Universität Bonn, Report Bonn-IR-2010-05, (2010), available on http://hss.ulb.uni-bonn.de/2010/2127/2127.pdf.
ZEUS collaboration, H. Abramowicz et al., Measurement of beauty production in DIS and \( F_2^{{b\overline{b}}} \) extraction at ZEUS, Eur. Phys. J. C 69 (2010) 347 [arXiv:1005.3396] [INSPIRE].
ZEUS collaboration, H. Abramowicz et al., Measurement of beauty production in deep inelastic scattering at HERA using decays into electrons, Eur. Phys. J. C 71 (2011) 1573 [arXiv:1101.3692] [INSPIRE].
H1 and ZEUS collaborations, HERAPDF1.5, Proceedings of the XXXV International Conference of High Energy Physics, Paris, France, July 22-28 2010, PoS(ICHEP 2010)168, LHAPDF grid, LHAPDF grid available on https://www.desy.de/h1zeus/combined_results/index.php?do=proton_structure.
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ArXiv ePrint: 1302.5058
Deceased (B. A. Dolgoshein, P. F. Ermolov, A. Eskreys)
Supported by the US Department of Energy (1, 37, 56)
Supported by the Italian National Institute for Nuclear Physics (INFN) (3, 4, 8, 17, 18, 39, 40, 43, 49, 50)
Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05 H09PDF (5)
Supported by the Science and Technology Facilities Council, UK (6, 20, 23, 38, 44, 52)
Supported by HIR and UMRG grants from Universiti Malaya, and an ERGS grant from the Malaysian Ministry for Higher Education (10)
Supported by the US National Science Foundation. Any opinion, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. (11, 41)
Supported by the Polish Ministry of Science and Higher Education as a scientific project No. DPN/N188/DESY/2009 (12)
Supported by the Polish Ministry of Science and Higher Education and its grants for Scientific Research (13)
Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05h09GUF, and the SFB 676 of the Deutsche Forschungsgemeinschaft (DFG) (22)
Supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and its grants for Scientific Research (24, 32, 42, 46, 47, 48)
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Supported by FNRS and its associated funds (IISN and FRIA) and by an Inter-University Attraction Poles Programme subsidised by the Belgian Federal Science Policy Office (29)
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Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) (31, 51, 57)
Partially supported by the German Federal Ministry for Education and Research (BMBF) (33)
Supported by RF Presidential grant N 3920.2012.2 for the Leading Scientific Schools and by the Russian Ministry of Education and Science through its grant for Scientific Research on High Energy Physics (34)
Supported by the Netherlands Foundation for Research on Matter (FOM) (36)
Supported by the Israel Science Foundation (45)
Also funded by Max Planck Institute for Physics, Munich, Germany (R. Aggarwal, P. Kaur, I. Singh)
Supported by the research grant No. 1 P03B 04529 (2005-2008) (A. Kotanski)
Now at DESY group FS-CFEL-1 (N. Coppola)
Partially supported by the Polish National Science Centre projects DEC-2011/01/B/ST2/03643 and DEC-2011/03/B/ST2/00220 (W. Slominski)
Partially supported by Warsaw University, Poland (J. Tomaszewska)
Supported by the Alexander von Humboldt Foundation (O. Turkot, K. Wichmann)
Supported by DESY, Germany (V. Aushev, Y. Aushev, V. Bokhonov, N. Zhmak)
Member of National Technical University of Ukraine, Kyiv Polytechnic Institute, Kyiv, Ukraine (Y. Aushev)
Member of National Technical University of Ukraine, Kyiv, Ukraine (A. Iudin)
Now at DESY ATLAS group (N. Kondrashova)
Member of National University of Kyiv - Mohyla Academy, Kyiv, Ukraine (N. Kovalchuk, A. Trofymov, O. Turkot, N. Zakharchuk)
Alexander von Humboldt Professor; also at DESY and University of Oxford
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This material was based on work supported by the National Science Foundation, while working at the Foundation.
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The ZEUS collaboration., Abramowicz, H., Abt, I. et al. Measurement of D ± production in deep inelastic ep scattering with the ZEUS detector at HERA. J. High Energ. Phys. 2013, 23 (2013). https://doi.org/10.1007/JHEP05(2013)023
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DOI: https://doi.org/10.1007/JHEP05(2013)023