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.

scholarly journals Jet quenching from heavy to light ion collisions

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
B. G. Zakharov
Keyword(s):  
Quark Gluon Plasma ◽  
Reasonable Agreement ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Jet Quenching ◽  
Light Nuclei ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Modification Factor

Abstract We perform an analysis of jet quenching in heavy and light ion collisions for scenarios without and with quark-gluon plasma formation in pp collisions. We find that the results for these scenarios are very similar, and both of them are in reasonable agreement with data for heavy ion collisions. However, their results become differ significantly for light nuclei. Using the parameters fitted to heavy ion data on the nuclear modification factor RAA, we make predictions for 0.2 and 7 TeV O+O collisions that can be verified by future experiments at RHIC and the LHC.

MEASUREMENT OF THE MULTI-HADRON DECAYS OF ω, $K^0_S$ AND η-MESONS IN HEAVY ION COLLISIONS AT $\sqrt{^SNN} = 200\ {\rm GeV}$ IN THE PHENIX EXPERIMENT AT RHIC

2007 ◽  
Vol 16 (07n08) ◽  
pp. 1864-1869 ◽  
Author(s):  
◽  
V. RYABOV
Keyword(s):  
Heavy Ion Collisions ◽  
Meson Production ◽  
Heavy Ion ◽  
Hadronic Decay ◽  
Decay Channels ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Phenix Experiment ◽  
Ion Collisions ◽  
Modification Factor

The PHENIX experiment at RHIC measured ω, η and [Formula: see text]-meson production at high pT in p + p, d + Au and Au + Au collisions at [Formula: see text]. Measurements performed in different hadronic decay channels give consistent results. The measured ratios of all three mesons to π0 are found to be flat as a function of pT in p + p collisions and equal to ω/π0 = 0.81 ± 0.02 ± 0.07, η/π0 = 0.48 ± 0.02 ± 0.02 and [Formula: see text]. Nuclear modification factor measured for ω-mesons in central Au + Au collisions is RAA = 0.4 ± 0.15.

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 Relativistic Langevin dynamics: charm versus beauty

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Shuang Li ◽  
Wei Xiong ◽  
Renzhuo Wan
Keyword(s):  
Energy Loss ◽  
Experimental Tests ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Azimuthal Anisotropy ◽  
Mass Hierarchy ◽  
Heavy Flavor ◽  
Nuclear Modification Factor ◽  
Ion Collisions ◽  
Modification Factor

AbstractThe production of heavy quarks (charm and beauty) provides unique insights into the transport properties of the Quark–Gluon Plasma (QGP) in heavy-ion collisions. Experimentally, the nuclear modification factor $$R_{\mathrm{AA}}$$ R AA and the azimuthal anisotropy coefficient $$v_{\mathrm{2}}$$ v 2 of heavy-flavor mesons are powerful observables to study the medium-related effects, such as energy loss and collectivity, on the heavy quark propagation through the QGP evolution. The latest measurements of the prompt and non-prompt open heavy-flavor hadrons allow a systematic comparison of the transport behaviors probed by charm and beauty quarks. In this work we make such an attempt utilizing our recently developed framework. By performing a quantitative investigation of $$R_{\mathrm{AA}}$$ R AA and $$v_{\mathrm{2}}$$ v 2 , it is found that both charm and beauty quarks are efficient probes to capture the dynamical features of QGP, in particular the resulting mass hierarchy for the energy loss and azimuthal anisotropy, which are well inherited by the various D/B-meson species. Moreover, our calculations can describe simultaneously $$R_{\mathrm{AA}}$$ R AA and $$v_{\mathrm{2}}$$ v 2 data for the prompt and non-prompt $$D^{0}$$ D 0 mesons in central ($$0-10\%$$ 0 - 10 % ) and semi-central ($$30-50\%$$ 30 - 50 % ) Pb–Pb collisions at $$\sqrt{s_{\mathrm{NN}}}=5.02~{\mathrm{TeV}}$$ s NN = 5.02 TeV . The predictions for B-meson observables for upcoming experimental tests are also made down to the low momentum region.

scholarly journals Measurements of Λc+ in pp, p–Pb and Pb–Pb collisions with ALICE at the LHC

2020 ◽  
Vol 1643 (1) ◽  
pp. 012011
Author(s):  
C Hills
Keyword(s):  
Quark Gluon Plasma ◽  
Heavy Ion ◽  
Gluon Plasma ◽  
Lhcb Collaboration ◽  
Charm Quarks ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Ion Collisions ◽  
Model Predictions ◽  
Modification Factor

Abstract The baryon-to-meson ratio Λ c + / D 0 and the nuclear modification factor RAA in the charm sector are important observables to gain an understanding of how charm quarks hadronise and lose energy in the Quark-Gluon Plasma produced in heavy-ion collisions. In this contribution, recent measurements performed with the ALICE detector in pp, p–Pb and Pb–Pb collisions at 5.02 TeV are presented and compared with previous measurements in pp collisions at 7 TeV, measurements by the LHCb Collaboration and theoretical model predictions.

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