D-Meson production from 400 GeV/c pp interactions

Aguilar-Benı́tez, M.; Allison, W.W.M.; Bailly, J. L.; Banerjee, S.; Bartl, W.; Begalli, M.; Beillière, P.; Bizzarri, R.; Briand, H.; Brun, R.; Canale, V.; Caso, C.; Castelli, E.; Checchia, P.; Chliapnikov, P.; Colino, N.; Colwill, S. J.; Contri, R.; Crennell, D.; Angelis, A. De; Billy, L. de; Defoix, C.; Marco, R.; Capua, E. Di; Diez-Hedo, F.; Dolbeau, J.; Dumarchez, J.; Eriksson, Martin; Falciano, S.; Fernández, C.; Fisher, Colin; Fisyak, Y.; Fontanelli, F.; Fry, J. R.; Ganguli, S. N.; Gasparini, U.; Gensch, U.; Gentile, S.; Gibaut, D.; Goshaw, A. T.; Grard, F.; Gurtu, A.; Hamatsu, R.; Haupt, L.; Hellman, S.; Hernández, J. J.; Holmgren, S. O.; Houlden, M.; Hrubec, J.; Hughes, P.; Huss, D.; Iga, Y.; Iori, M.; Jegham, E.; Johansson, K. E.; Josa, M. I.; Kalelkar, M.; Kholodenko, A. G.; Kistenev, E.; Kitamura, S.; Knauss, D.; Kniazev, V. V.; Kowald, W.; Kühn, D.; Laloum, M.; Legros, P.; Leutz, H.; MacDermott, M.; Mason, P.; Mazzucato, M.; Michalon-Mentzer, M.E.; Michalon, A.; Moa, T.; Monge, R.; Montanet, L.; Naumann, T.; Neuhofer, G.; Nguyen, H. K.; Nilsson, S.; Nowak, H.; Oshima, N.; Otter, G.; Ouared, R.; Comellas, J. Panella; Patel, G. D.; Pernicka, M.; Pilette, P.; Pinori, C.; Piredda, G.; Plano, R. J.; Poppleton, A.; Poropat, P.; Raghavan, R.; Reucroft, S.; Roberts, K.; Robertson, W. J.; Rohringer, H.; Salicio, J. M.; Schulte, R.; Selldén, B.; Sessa, M.; Squarcia, S.; Stamer, P.; Stopchenko, V. A.; Sudhakar, K.; Takahashi, K.; Touboul, M. C.; Trevisan, U.; Troncon, C.; Tsurugai, T.; Vlasov, E.; Vilain, P.; Voltolini, C.; Vonck, B.; Walker, W. D.; Wild, C. F.; Yiou, T. P.; Zumerle, G.

doi:10.1016/0370-2693(87)90663-0

Cited by 56 publications

(19 citation statements)

References 22 publications

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“…The delta-function model assumes that the charmed quark coalesces with a low-x spectator sea quark or a low momentum secondary quark such that the charmed quark retains its momentum [18]. This model is more consistent with low p T charmed hadroproduction data [25,26,27] than Peterson fragmentation.…”

Section: Leading-twist Productionmentioning

confidence: 98%

Charmed hadron asymmetries in the intrinsic charm coalescence model

Vogt

Brodsky

1996

Nuclear Physics B

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Fermilab experiment E791, measuring charmed hadron production in π − A interactions at 500 GeV with high statistics, has observed a strong asymmetry between the hadroproduction cross sections for leading D mesons which contain projectile valence quarks and the nonleading charmed mesons without projectile valence quarks. Such correlations of the charge of the D meson with the quantum numbers of the beam hadron explicitly contradict the factorization theorem in perturbative QCD which predicts that heavy quarks hadronize through a jet fragmentation function that is independent of the initial state. The E791 experiment also measures Λ c /Λ c and D s /D s production asymmetries as well as asymmetries in DD pair production. We examine these asymmetries and the fractional longitudinal momentum, x F , distributions for single and pairs of charmed hadrons within a two-component model combining leading-twist gg and qq fusion subprocesses with charm production from intrinsic heavy quark Fock states. A key feature of this analysis is intrinsic charm coalescence, the process by which a charmed quark in the projectile's Fock state wavefunction forms charmed hadrons by combining with valence quarks of similar rapidities.

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Section: Leading-twist Productionmentioning

confidence: 98%

Charmed hadron asymmetries in the intrinsic charm coalescence model

Vogt

Brodsky

1996

Nuclear Physics B

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“…Alternatively, one might argue that there is a stronger energy dependence related to some threshold behavior for putting the charm quarks on their mass shell. We make a very crude model for this by taking the intrinsic charm cross section to be a constant fraction of the pQCD charm cross section IC2 : σ IC (s) = 0.1 σ pQCD (s) (45) as shown by curve IC2 in Fig. 7.…”

Section: Possible Non-perturbative Origin Of Charmmentioning

confidence: 99%

Charm production and high energy atmospheric muon and neutrino fluxes

Thunman

Ingelman

Gondolo

1996

Astroparticle Physics

182

202

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Production of muons and neutrinos in cosmic ray interactions with the atmosphere has been investigated with Monte Carlo models for hadronic interactions. The resulting conventional muon and neutrino fluxes (from π and K decays) agree well with earlier calculations, whereas our prompt fluxes from charm decays are significantly lower than earlier estimates. Charm production is mainly considered as a well defined perturbative QCD process, but we also investigate a hypothetical nonperturbative intrinsic charm component in the proton. The lower charm rate implies better prospects for detecting very high energy neutrinos from cosmic sources. IntroductionThe flux of muons and neutrinos at the earth has an important contribution from decays of particles produced through the interaction of cosmic rays in the atmosphere (for a recent introduction see [1]). This has an interest in its own right, since it reflects primary interactions at energies that can by far exceed the highest available accelerator energies. It is also a background in studies of neutrinos from cosmic sources as attempted in large neutrino telescopes, such as Amanda [2], Baikal [3], Dumand [4] and Nestor [5].Here we present a detailed study of muon and neutrino production in cosmic ray interactions with nuclei in the atmosphere using Monte Carlo simulations [6].At GeV energies the atmospheric muon and neutrino fluxes are dominated by 'conventional' sources, i.e. decays of relatively long-lived particles such as π and K mesons. This is well understood from earlier studies [7,8,9], with which our investigations agree. With increasing energy, the probability increases that such particles interact in the atmosphere before decaying. This implies that even a small fraction of short-lived particles can give the dominant contribution to high energy muon and neutrino fluxes. These 'prompt' muons and neutrinos arise through semi-leptonic decays of hadrons containing heavy quarks, most notably charm.Available data in the multi-TeV energy range, obtained with surface and underground detectors (see e.g. refs. [10][11][12][13]), are still too discrepant to draw definitive conclusions on the flux of 1 thunman@tsl.uu.se 2 ingelman@tsl.uu.se, also at DESY, Hamburg.

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“…The values for the other data lines are computed from D-meson cross sections according the argument in ref. [26] by using the published experiment results [27][28][29][30]. Earlier experiment results [31] also show big uncertainties among the different experiments.…”

Section: Initial Charm Productionmentioning

confidence: 99%

“…As a further check on the parameters we compare charmed hadron x f results in Fig. 3 with 400 GeV p − p data [27] using the idealized δ-functionfragmentation function. The realistic fragmentation function used in ref.…”

Section: Initial Charm Productionmentioning

confidence: 99%

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Open charm as a probe of pre-equilibrium dynamics in nuclear collisions?

Lin

Gyulassy

1995

Nuclear Physics A

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The pre-equilibrium contribution to open charm production in nuclear collisions at √ s = 200 AGeV is calculated using three different models for the correlations between momentum and space-time coordinates. Ideal (Bjorken) correlation between the rapidity y and space-time rapidity η of mini-jet gluons suppresses greatly the pre-equilibrium yield and even allowing for the minimal uncertainty correlations leads, in contrast to previous estimates, only to a small pre-equilibrium charm yield as compared to initial yield due to gluon fusion. The "intrinsic" charm process is negligible in the mid-rapidity domain.

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D-Meson production from 400 GeV/c pp interactions

Cited by 56 publications

References 22 publications

Charmed hadron asymmetries in the intrinsic charm coalescence model

Charmed hadron asymmetries in the intrinsic charm coalescence model

Charm production and high energy atmospheric muon and neutrino fluxes

Open charm as a probe of pre-equilibrium dynamics in nuclear collisions?

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