Abstract
Next-to-leading order (NLO) QCD predictions for the production of heavy quarks in proton-proton collisions are presented within three different approaches to quark mass, resummation and fragmentation effects. In particular, new NLO and parton shower simulations with POWHEG are performed in the ALICE kinematic regime at three different centre-of-mass energies, including scale and parton density variations, in order to establish a reliable baseline for future detailed studies of heavy-quark suppression in heavy-ion collisions. Very good agreement of POWHEG is found with FONLL, in particular for centrally produced D 0, D + and D *+ mesons and electrons from charm and bottom quark decays, but also with the generally somewhat higher GM-VFNS predictions within the theoretical uncertainties. The latter are dominated by scale rather than quark mass variations. Parton density uncertainties for charm and bottom quark production are computed here with POWHEG for the first time and shown to be dominant in the forward regime, e.g. for muons coming from heavy-flavour decays. The fragmentation into D s mesons seems to require further tuning within the NLO Monte Carlo approach.
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References
M. Cacciari, M. Greco and P. Nason, The p T spectrum in heavy flavor hadroproduction, JHEP 05 (1998) 007 [hep-ph/9803400] [INSPIRE].
B.A. Kniehl, G. Kramer, I. Schienbein and H. Spiesberger, Inclusive D *± production in pp collisions with massive charm quarks, Phys. Rev. D 71 (2005) 014018 [hep-ph/0410289] [INSPIRE].
S. Frixione, P. Nason and B.R. Webber, Matching NLO QCD and parton showers in heavy flavor production, JHEP 08 (2003) 007 [hep-ph/0305252] [INSPIRE].
S. Frixione, P. Nason and G. Ridolfi, A positive-weight next-to-leading-order Monte Carlo for heavy flavour hadroproduction, JHEP 09 (2007) 126 [arXiv:0707.3088] [INSPIRE].
T. Sjöstrand, S. Mrenna and P.Z. Skands, A brief introduction to PYTHIA 8.1, Comput. Phys. Commun. 178 (2008) 852 [arXiv:0710.3820] [INSPIRE].
G. Corcella et al., HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes), JHEP 01 (2001) 010 [hep-ph/0011363] [INSPIRE].
P.M. Nadolsky et al., Implications of CTEQ global analysis for collider observables, Phys. Rev. D 78 (2008) 013004 [arXiv:0802.0007] [INSPIRE].
M. Klasen and G. Kramer, Large transverse momentum jet production and DIS distributions of the proton, Phys. Lett. B 386 (1996) 384 [hep-ph/9605210] [INSPIRE].
ALICE collaboration, Measurement of charm production at central rapidity in proton-proton collisions at \( \sqrt{s} \) = 2.76 TeV, JHEP 07 (2012) 191 [arXiv:1205.4007] [INSPIRE].
ALICE collaboration, Measurement of charm production at central rapidity in proton-proton collisions at \( \sqrt{s} \) = 7 TeV, JHEP 01 (2012) 128 [arXiv:1111.1553] [INSPIRE].
ALICE collaboration, D + s meson production at central rapidity in proton-proton collisions at \( \sqrt{s} \) = 7 TeV, Phys. Lett. B 718 (2012) 279 [arXiv:1208.1948] [INSPIRE].
M. Cacciari et al., Theoretical predictions for charm and bottom production at the LHC, JHEP 10 (2012) 137 [arXiv:1205.6344] [INSPIRE].
Y. He, I. Vitev and B.-W. Zhang, \( \mathcal{O}\left({\alpha}_s^3\right) \) analysis of inclusive jet and di-jet production in heavy ion reactions at the Large Hadron Collider, Phys. Lett. B 713 (2012) 224 [arXiv:1105.2566] [INSPIRE].
W.A. Horowitz and M. Gyulassy, Quenching and tomography from RHIC to LHC, J. Phys. G 38 (2011) 124114 [arXiv:1107.2136] [INSPIRE].
A. Buzzatti and M. Gyulassy, Jet flavor tomography of quark gluon plasmas at RHIC and LHC, Phys. Rev. Lett. 108 (2012) 022301 [arXiv:1106.3061] [INSPIRE].
P.B. Gossiaux, R. Bierkandt and J. Aichelin, Tomography of a quark gluon plasma at RHIC and LHC energies, Phys. Rev. C 79 (2009) 044906 [arXiv:0901.0946] [INSPIRE].
P.B. Gossiaux, J. Aichelin, T. Gousset and V. Guiho, Competition of heavy quark radiative and collisional energy loss in deconfined matter, J. Phys. G 37 (2010) 094019 [arXiv:1001.4166] [INSPIRE].
O. Fochler, J. Uphoff, Z. Xu and C. Greiner, Jet quenching and elliptic flow at RHIC and LHC within a pQCD-based partonic transport model, J. Phys. G 38 (2011) 124152 [arXiv:1107.0130] [INSPIRE].
W.M. Alberico et al., Heavy-flavour spectra in high energy nucleus-nucleus collisions, Eur. Phys. J. C 71 (2011) 1666 [arXiv:1101.6008] [INSPIRE].
M. Monteno et al., Heavy-flavor dynamics in nucleus-nucleus collisions: from RHIC to LHC, J. Phys. G 38 (2011) 124144 [arXiv:1107.0256] [INSPIRE].
W.A. Horowitz, Testing pQCD and AdS/CFT energy loss at RHIC and LHC, AIP Conf. Proc. 1441 (2012) 889 [arXiv:1108.5876] [INSPIRE].
ALICE collaboration, Production of muons from heavy flavour decays at forward rapidity in pp and Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}} \) = 2.76 TeV, Phys. Rev. Lett. 109 (2012) 112301 [arXiv:1205.6443] [INSPIRE].
ALICE collaboration, Measurement of electrons from semileptonic heavy-flavour hadron decays in pp collisions at \( \sqrt{s} \) = 7 TeV, Phys. Rev. D 86 (2012) 112007 [arXiv:1205.5423] [INSPIRE].
ALICE collaboration, Measurement of electrons from beauty hadron decays in pp collisions at \( \sqrt{s} \) = 7 TeV, Phys. Lett. B 721 (2013) 13 [arXiv:1208.1902] [INSPIRE].
ALICE collaboration, Heavy flavour decay muon production at forward rapidity in proton-proton collisions at \( \sqrt{s} \) = 7 TeV, Phys. Lett. B 708 (2012) 265 [arXiv:1201.3791] [INSPIRE].
Particle Data Group collaboration, J. Beringer et al., Review of particle physics (RPP), Phys. Rev. D 86 (2012) 010001 [INSPIRE].
B. Mele and P. Nason, The fragmentation function for heavy quarks in QCD, Nucl. Phys. B 361 (1991) 626 [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].
M. Cacciari and P. Nason, Charm cross-sections for the Tevatron run II, JHEP 09 (2003) 006 [hep-ph/0306212] [INSPIRE].
M. Cacciari, P. Nason and R. Vogt, QCD predictions for charm and bottom production at RHIC, Phys. Rev. Lett. 95 (2005) 122001 [hep-ph/0502203] [INSPIRE].
B.A. Kniehl, G. Kramer, I. Schienbein and H. Spiesberger, Collinear subtractions in hadroproduction of heavy quarks, Eur. Phys. J. C 41 (2005) 199 [hep-ph/0502194] [INSPIRE].
Kramer, Michael, F.I. Olness and D.E. Soper, Treatment of heavy quarks in deeply inelastic scattering, Phys. Rev. D 62 (2000) 096007 [hep-ph/0003035] [INSPIRE].
T. Kneesch, B.A. Kniehl, G. Kramer and I. Schienbein, Charmed-meson fragmentation functions with finite-mass corrections, Nucl. Phys. B 799 (2008) 34 [arXiv:0712.0481] [INSPIRE].
M.G. Bowler, e + e − production of heavy quarks in the string model, Z. Phys. C 11 (1981) 169 [INSPIRE].
B.A. Kniehl, G. Kramer, I. Schienbein and H. Spiesberger, Inclusive charmed-meson production at the CERN LHC, Eur. Phys. J. C 72 (2012) 2082 [arXiv:1202.0439] [INSPIRE].
B.A. Kniehl and G. Kramer, Charmed-hadron fragmentation functions from CERN LEP1 revisited, Phys. Rev. D 74 (2006) 037502 [hep-ph/0607306] [INSPIRE].
B.A. Kniehl, G. Kramer, I. Schienbein and H. Spiesberger, Finite-mass effects on inclusive B meson hadroproduction, Phys. Rev. D 77 (2008) 014011 [arXiv:0705.4392] [INSPIRE].
B.A. Kniehl, G. Kramer, I. Schienbein and H. Spiesberger, Inclusive B-meson production at the LHC in the GM-VFN scheme, Phys. Rev. D 84 (2011) 094026 [arXiv:1109.2472] [INSPIRE].
P. Bolzoni and G. Kramer, Inclusive lepton production from heavy-hadron decay in pp collisions at the LHC, Nucl. Phys. B 872 (2013) 253 [Erratum ibid. B 876 (2013) 334] [arXiv:1212.4356] [INSPIRE].
P. Bolzoni and G. Kramer, Inclusive charmed-meson production from bottom hadron decays at the LHC, J. Phys. G 41 (2014) 075006 [arXiv:1310.2924] [INSPIRE].
M.R. Whalley, D. Bourilkov and R.C. Group, The Les Houches accord PDFs (LHAPDF) and LHAGLUE, hep-ph/0508110 [INSPIRE].
D. Stump et al., Inclusive jet production, parton distributions and the search for new physics, JHEP 10 (2003) 046 [hep-ph/0303013] [INSPIRE].
K.J. Eskola, H. Paukkunen and C.A. Salgado, EPS09: a new generation of NLO and LO nuclear parton distribution functions, JHEP 04 (2009) 065 [arXiv:0902.4154] [INSPIRE].
ALICE collaboration, Suppression of high transverse momentum D mesons in central Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}} \) = 2.76 TeV, JHEP 09 (2012) 112 [arXiv:1203.2160] [INSPIRE].
H. Spiesberger, Inclusive D-meson production at the LHC, arXiv:1205.7000 [INSPIRE].
M. Klasen and M. Brandt, Parton densities from LHC vector boson production at small and large transverse momenta, Phys. Rev. D 88 (2013) 054002 [arXiv:1305.5677] [INSPIRE].
M. Brandt, M. Klasen and F. König, Nuclear parton density modifications from low-mass lepton pair production at the LHC, Nucl. Phys. A 927 (2014) 78 [arXiv:1401.6817] [INSPIRE].
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Klasen, M., Klein-Bösing, C., Kovarik, K. et al. NLO Monte Carlo predictions for heavy-quark production at the LHC: pp collisions in ALICE. J. High Energ. Phys. 2014, 109 (2014). https://doi.org/10.1007/JHEP08(2014)109
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DOI: https://doi.org/10.1007/JHEP08(2014)109