The pT spectrum in heavy-flavour hadroproduction

Cacciari, Matteo; Greco, Mario; Nason, Paolo

doi:10.1088/1126-6708/1998/05/007

Cited by 857 publications

(1,188 citation statements)

References 20 publications

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“…The partonic cross section dσ ij→Q(Q){k} is calculated as a perturbative series in the strong coupling α s , which depends on the energy scale of the process, indicated here as renormalization scale, µ R ; currently, calculations are performed up to next-to-leading order (NLO), O(α 3 s ) (MNR [28], GM-VFNS [29][30][31], MC@NLO [32,33]), or at fixed order with next-to-leading-log resummation (FONLL [34][35][36]). The Parton Distribution Function (PDF), f i (x 1 , µ 2 F ) encodes the partonic structure of the colliding protons and can be interpreted as the probability to find a parton i inside the proton with fraction of momentum x 1 = p i /p p (Bjorken x).…”

Section: Heavy-flavour Production In Pp Collisionsmentioning

confidence: 99%

“…The author Jamie Nagle fo ported by the U DE-AC02-98CH [95] and FONLL [34][35][36] heavy-meson spectra have been used to generate these results [93].…”

Section: Vmentioning

confidence: 99%

“…The parameters of the blast-wave (flow velocity β, and freezeout temperature) were extracted from the fits to the identified particle p T distributions measured in d-Au [94] and p-Pb collisions [95], then the heavy-flavour meson spectra were determined using the extracted parameters and the D and B meson masses. In order to quantify the nuclear modification factor for heavy mesons expected from the blast wave, the nuclear modification factor with respect to the FONLL [34][35][36] the d+Au yield by the p+p yield from [23]. At higher transverse momentum, where the p+p heavy-flavor electron spectrum is consistent with a shape from pQCD, a fit to the spectral shape from the [24] calculations is used to represent the p+p yield.…”

Section: Vmentioning

confidence: 99%

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Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

Festanti

2016

Springer Theses

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This thesis presents the measurement of the charmed D 0 meson production relative to the reaction plane in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon collision of √ s NN = 2.76 TeV, and the measurement of the D 0 production in p-Pb collisions at √ s NN = 5.02 TeV with the ALICE detector at the CERN Large Hadron Collider.The D 0 azimuthal anisotropy with respect to the reaction plane is sensitive to the interaction of the charm quarks with the high-density strongly-interacting medium formed in ultra-relativistic heavy-ion collisions and, thus, to the properties of this state of matter. In particular, this observable allows to establish whether low-momentum charm quarks participate in the collective expansion of the system and whether they can reach thermal equilibrium with the medium constituents. The azimuthal anisotropy is quan- −0.036 in the interval 2 < p T < 6 GeV/c, which decreases towards more central collisions. Consequently, the nuclear modification factor shows a stronger suppression in the direction orthogonal to the reaction plane. The v 2 and the R AA measured in two azimuthal regions with respect to the reaction plane are compared to theoretical calculations of charm quark transport and energy loss in high-density strongly-interacting matter. The models that include substantial elastic interactions with an expanding medium provide a good description of the observed anisotropy.The D 0 nuclear modification factor R pPb in p-Pb collisions is compatible with unity within uncertainties. The measured R pPb is compared to theoretical models including initial state effects, as well as to the nuclear modification factor measured in central RiassuntoLa tesi presenta la misura della produzione di mesoni D 0 rispetto al piano di reazione in collisioni Pb-Pb all'energia nel centro di massa di √ s NN = 2.76 TeV per coppia di nucleoni e la misura della produzione di D 0 in collisioni p-Pb all'energia di √ s NN = 5.02 TeV con l'esperimento ALICE situato al Large Hadron Collider del CERN.L'anisotropia azimutale dei mesoni D 0 rispetto al piano di reazioneè sensibile alle interazioni del quark charm con il mezzo ad alta densità e fortemente interagente prodotto in collisioni tra ioni pesanti ad energia ultra-relativistica e, di conseguenza, alle proprietà di questo stato della materia. In particolare, permette di stabilire se i quark charm partecipano all'espansione collettiva del sistema e se raggiungono l'equilibrio termico con i costituenti del mezzo. L'anisotropia azimutaleè quantificata tramite il secondo coefficiente v 2 dello sviluppo in serie di Fourier della distribuzione azimutale dei mesoni D 0 e tramite la misura del fattore di modifica nucleare R AA nel piano di reazione e nella direzione ortogonale ad esso. La misura della produzione di D 0 in collisioni p-Pb permette di studiare gli effetti indotti dalla materia nucleare fredda, in modo da poterli distinguere da quelli indotti dal mezzo denso fortemente interagente prodotto in collisioni Pb-Pb.La produzione di mesoni D 0...

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Section: Heavy-flavour Production In Pp Collisionsmentioning

confidence: 99%

“…The author Jamie Nagle fo ported by the U DE-AC02-98CH [95] and FONLL [34][35][36] heavy-meson spectra have been used to generate these results [93].…”

Section: Vmentioning

confidence: 99%

Section: Vmentioning

confidence: 99%

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Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

Festanti

2016

Springer Theses

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“…From a fonll calculation [8,20,21] we set the initial momentum of the quark with uniformly distributed ϕ direction.…”

Section: Energy Loss Modelmentioning

confidence: 99%

Heavy flavor electronR_AAand υ₂in event-by-event relativistic hydrodynamics

Prado

Cosentino

Munhoz

et al. 2016

J. Phys.: Conf. Ser.

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Abstract. In this work we investigate how event-by-event hydrodynamics fluctuations affect the nuclear suppression factor and elliptic flow of heavy flavor mesons and non-photonic electrons. We use a 2D+1 Lagrangian ideal hydrodynamic code [1, 2] on an event-by-event basis in order to compute local temperature and flow profiles. Using a strong coupling inspired energy loss parametrization [3] on top of the evolving space-time energy density distributions we are able to propagate the heavy quarks inside the medium until the freeze-out temperature is reached and a Pythia [4] modeling of hadronization takes place. The resulting D 0 and heavyflavor electron yield is compared with recent experimental data for RAA and v2 from the Star and Phenix collaborations [5][6][7]. In addition we present preditions for the higher order Fourier harmonic coefficients v3(pT ) of heavy-flavor electrons at Rhic's √ SNN = 200 GeV collisions. IntroductionCentral Au+Au collisions at Rhic and Pb+Pb at Lhc exhibit a strong particle suppression when compared to p+p collisions as well as anisotropic flow. The suppression is usually related with jet quenching or energy loss of partons inside the quark-gluon-plasma (qgp) whereas the flow might be due to lumps of higher density inside the medium due to initial fluctuations. Furthermore while the qgp dynamics may affect differently the expansion of these high-density spots in comparison with the rest of the plasma it can affect higher harmonic orders of anisotropic flow such as v 3 .We aim to study these effects of the medium on the heavy quarks suppression during their evolution inside the qgp. In order to achieve this goal we performed computational simulations of the evolution of heavy quarks. The simulation consists of a sampled quark drawn from an initial condition energy density profile. The quark is then evolved inside the medium while the medium itself expands. The initial p T distribution is given by First-Order Next-to-Leading Logs (fonll [8]) calculation. After evolution quarks reach the freeze-out temperature and hadronize. The resulting meson decays into electrons we can analyse and compare with experimental data of electron R AA and v 2 .

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“…Hence, once this contribution is properly defined, extracted from highly accurate e + e − data, and consistently and correctly used in hadronic collisions, it will not degrade the accuracy provided by the perturbative calculations, even if its numerical effect will be non-negligible. One framework which implements all this is the so-called FONLL [20], and many of the comparisons which will be shown in the following are based on it.…”

Section: Open Heavy Quark Productionmentioning

confidence: 99%

pQCD calculations of heavy quark andJ/ψ production

Cacciari¹

2007

J. Phys. G: Nucl. Part. Phys.

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The p_T spectrum in heavy-flavour hadroproduction

Cited by 857 publications

References 20 publications

Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

Heavy flavor electronR_AAand υ₂in event-by-event relativistic hydrodynamics

pQCD calculations of heavy quark andJ/ψ production

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The pT spectrum in heavy-flavour hadroproduction

Cited by 857 publications

References 20 publications

Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

Measurement of the D0 Meson Production in Pb–Pb and p–Pb Collisions

Heavy flavor electronRAAand υ2in event-by-event relativistic hydrodynamics

pQCD calculations of heavy quark andJ/ψ production

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Product

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About

The p_T spectrum in heavy-flavour hadroproduction

Heavy flavor electronR_AAand υ₂in event-by-event relativistic hydrodynamics