Combined analysis of charm-quark fragmentation-fraction measurements

Lisovyi, M.; Verbytskyi, A.; Zenaiev, O.

doi:10.1140/epjc/s10052-016-4246-y

Cited by 120 publications

(125 citation statements)

References 47 publications

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“…As pointed out in Refs. [60,61], measurements in e + e − , ep and pp collisions agree within uncertainties, supporting the hypothesis that fragmentation is independent of the specific production process. 1 The resulting cc cross section per unit of rapidity at mid-rapidity is:…”

Section: Resultssupporting

confidence: 66%

Measurement of D-meson production at mid-rapidity in pp collisions at $${\sqrt{s}=7}$$ s = 7 TeV

Acharya¹,

Adamová²,

Aggarwal³

et al. 2017

Eur. Phys. J. C

108

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and their charge conjugates.With respect to previous measurements in the same rapidity region, the coverage in transverse momentum ( p T ) is extended and the uncertainties are reduced by a factor of about two. The accuracy on the estimated total cc production cross section is likewise improved. The measured p Tdifferential cross sections are compared with the results of three perturbative QCD calculations.

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Section: Resultssupporting

confidence: 66%

Measurement of D-meson production at mid-rapidity in pp collisions at $${\sqrt{s}=7}$$ s = 7 TeV

Acharya¹,

Adamová²,

Aggarwal³

et al. 2017

Eur. Phys. J. C

108

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“…The fragmentation fractions for charmed hadrons were taken from [211]. Their values are consistent with the recent determination from ee, ep and pp data [266]. The fragmentation fractions for beauty hadrons are taken from [247].…”

Section: Fragmentationmentioning

confidence: 64%

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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“…Furthermore, has been considered that a charm quark has different fragmentation fraction into specific final charm hadron channels, as in Ref. [35].…”

Section: Fireball and Parton Distributionsmentioning

confidence: 99%

“…While the estimated value for charmed baryon to meson ratio of about Λ c /D 0 ≃ 0.25 [37,38,65], is about a factor two larger with respect to pp and e + e − collisions according to Ref. [35].…”

Section: The Thermal Modelmentioning

confidence: 99%

Charmed hadrons from coalescence plus fragmentation in relativistic nucleus-nucleus collisions at RHIC and LHC

et al. 2018

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In a coalescence plus fragmentation approach we calculate the heavy baryon/meson ratio and the pT spectra of charmed hadrons D 0 , Ds and Λ + c in a wide range of transverse momentum from low pT up to about 10 GeV and discuss their ratios from RHIC to LHC energies without any change of the coalescence parameters. We have included the contribution from decays of heavy hadron resonances and also the one due to fragmentation of heavy quarks which do not undergo the coalescence process. The coalescence process is tuned to have all charm quarks hadronizing in the pT → 0 limit and at finite pT charm quarks not undergoing coalescence are hadronized by independent fragmentation. The pT dependence of the baryon/meson ratios are found to be sensitive to the masses of coalescing quarks, in particular the Λc/D 0 can reach values of about 1 ÷ 1.5 at pT ≈ 3 GeV, or larger, similarly to the light baryon/meson ratio like p/π and Λ/K, however a marked difference is a quite weak pT dependence with respect to the light case, such that a larger value at intermediate pT implies a relatively large value also for the integrated yields. A comparison with other coalescence model and with the prediction of thermal model is discussed.

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Combined analysis of charm-quark fragmentation-fraction measurements

Cited by 120 publications

References 47 publications

Measurement of D-meson production at mid-rapidity in pp collisions at $${\sqrt{s}=7}$$ s = 7 TeV

Measurement of D-meson production at mid-rapidity in pp collisions at $${\sqrt{s}=7}$$ s = 7 TeV

Charm production and QCD analysis at HERA and LHC

Charmed hadrons from coalescence plus fragmentation in relativistic nucleus-nucleus collisions at RHIC and LHC

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