scholarly journals Measurement of the D-meson Nuclear Modification Factor and Elliptic Flow in Pb–Pb Collisions at sNN = 5.02 TeV with ALICE at the LHC

2018 ◽  
Vol 46 ◽  
pp. 1860018 ◽  
Author(s):  
Syaefudin Jaelani
Keyword(s):  
Energy Loss ◽  
D Meson ◽  
Charm Quark ◽  
Elliptic Flow ◽  
Heavy Ion ◽  
Relativistic Heavy Ion Collisions ◽  
Event Shape ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Modification Factor

Heavy-flavour hadrons are effective probes to study the Quark-Gluon Plasma (QGP) formed in ultra-relativistic heavy-ion collisions. The ALICE Collaboration measured the D-mesons (D0, D[Formula: see text], D*[Formula: see text] and D[Formula: see text]) production in Pb–Pb collisions at [Formula: see text] = 5.02 TeV. The in-medium energy loss can be studied by means of the nuclear modification factor ([Formula: see text]). The comparison between the D[Formula: see text] and the non-strange D-meson [Formula: see text] can help to study the hadronisation mechanism of the charm quark in the QGP. In semi-central collisions the measurement of the D-meson elliptic flow, [Formula: see text], at low [Formula: see text] allows to investigate the participation of the heavy quarks in the collective expansion of the system while at high [Formula: see text] it constrains the path-length dependence of the energy loss. Furthermore the Event-Shape Engineering (ESE) technique is used to measure D-meson elliptic flow in order to study the coupling of the charm quarks to the light quarks of the underlying medium.

scholarly journals Measurement of the D-meson nuclear modification factor and elliptic flow in Pb–Pb collisions at √SNN = 5.02 TeV with ALICE at the LHC

2018 ◽  
Vol 171 ◽  
pp. 18007
Author(s):  
Fabrizio Grosa
Keyword(s):  
Energy Loss ◽  
D Meson ◽  
Charm Quark ◽  
Elliptic Flow ◽  
Heavy Ion ◽  
Event Shape ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Modification Factor ◽  
First Time

Heavy-flavour hadrons are recognised as a powerful probe for the characterisation of the deconfined medium created in heavy-ion collisions, the Quark-Gluon Plasma (QGP). The ALICE Collaboration measured the production of D0, D+, D*+ and [see formula in PDF] mesons in Pb–Pb collisions at [see formula in PDF] = 5.02 TeV. The measurement of the nuclear modification factor (RAA) provides a strong evidence of the in-medium parton energy loss. The comparison between the [see formula in PDF] and the non-strange D-meson RAA can help to study the hadronisation mechanism of the charm quark in the QGP. In mid-central collisions, the measurement of the D-meson elliptic flow v2 at low transverse momentum (pT) gives insight into the participation of the charm quark into the collective motion of the system, while at high pT it constrains the path-length dependence of the energy loss. The [see formula in PDF] v2, measured for the first time at the LHC, is found to be compatible to that of non-strange D mesons and positive with a significance of about 2.6 σ. The coupling of the charm quark to the light quarks in the underlying medium is further investigated for the first time with the application of the Event-Shape Engineering (ESE) technique to D-meson elliptic flow.

Measurement of D-meson production and flow in Pb–Pb collisions with ALICE at the LHC

2020 ◽  
pp. 2040004
Author(s):  
Fabio Catalano
Keyword(s):  
Energy Loss ◽  
D Meson ◽  
Charm Quark ◽  
Meson Production ◽  
Elliptic Flow ◽  
Gluon Plasma ◽  
Event Shape ◽  
Recombination Mechanism ◽  
Charm Quarks ◽  
Quark Energy Loss

Open-charmed mesons are unique tools to study the properties of the Quark–Gluon Plasma (QGP) formed in ultra-relativistic nucleus–nucleus collisions. The nuclear modification factor ([Formula: see text]) and elliptic flow ([Formula: see text]) of [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] mesons were measured by the ALICE Collaboration in Pb–Pb collisions at [Formula: see text]. The D-meson [Formula: see text] provides information on the charm-quark interactions with the medium and the charm-quark energy loss. The D-meson elliptic flow at low transverse momentum ([Formula: see text]) gives insight into the participation of charm quarks in the collective expansion of the system and their possible in-medium thermalization. At high [Formula: see text], the [Formula: see text] is sensitive to the path-length dependence of parton energy loss. The role of the recombination mechanism is investigated measuring the [Formula: see text]-differential yield ratios between D-meson species with and without strange-quark content. Finally, the coupling of charm quarks to light quarks of the underlying medium is examined applying the Event-Shape Engineering (ESE) technique to the nonstrange D-meson elliptic flow.

scholarly journals Quenching effects in the cumulative jet spectrum

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Adam Takacs ◽  
Konrad Tywoniuk
Keyword(s):  
Energy Loss ◽  
Size Dependence ◽  
Heavy Ion ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Modification Factor ◽  
Coupling Approach ◽  
Jet Fragmentation ◽  
Jet Observables

Abstract The steeply falling jet spectrum induces a bias on the medium modifications of jet observables in heavy-ion collisions. To explore this effect, we develop a novel analytic framework to study the quenched jet spectrum and its cumulative. We include many energy-loss-related effects, such as soft and hard medium induced emissions, broadening, elastic scattering, jet fragmentation, cone size dependence, and coherence effects. We show that different observables, based on the jet spectrum, are connected, e.g., the nuclear modification, spectrum shift, and the quantile procedure. We present the first predictions for the nuclear modification factor and the quantile procedure with cone size dependence. As a concrete example, we compare dijet and boson+jet events to unfold the spectrum bias effects, and improve quark-, and gluon-jet classification using arguments based on the cumulative. Besides pointing out its flexibility, finally, we apply our framework to other energy loss models such as the hybrid weak/strong-coupling approach.

scholarly journals Jet Quenching Beyond the Energy Loss Approach

2015 ◽  
Vol 37 ◽  
pp. 1560060
Author(s):  
Grigory Ovanesyan
Keyword(s):  
Energy Loss ◽  
Evolution Equations ◽  
Heavy Ion ◽  
Jet Quenching ◽  
Effective Theory ◽  
Dglap Evolution ◽  
Quenching Effect ◽  
Nuclear Modification Factor ◽  
Ion Collisions ◽  
Modification Factor

We study the jet quenching effect in heavy ion collisions, based on medium-induced splitting functions calculated from Soft Collinear Effective Theory with Glauber Gluons. Our method is formulated in the language of DGLAP evolution equations with medium-induced splitting functions. In the small-x soft gluon approximation we analytically solve the evolution equations and find an intuitive connection to the energy loss approach. For central Pb+Pb collisions at the LHC we quantify the effect of finite-x corrections for the nuclear modification factor and compare to data.

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