Thermal photons as a sensitive probe of $\alpha$-cluster in C+Au collisions at the BNL Relativistic Heavy Ion Collider

Abstract

Different orientations of $\alpha$-clustered carbon nuclei colliding with heavy ions can result in a large variation in the value of anisotropic flow. Thus, photon flow observables from clustered ${}^{12}\mathrm{C}$ and ${}^{197}\mathrm{Au}$ collisions could be a potential probe to study the `direct photon puzzle'. We calculate the transverse momentum spectra and anisotropic flow coefficients ($v_n$) of thermal photons from collisions of triangular $\alpha$-clustered carbon and gold at $\sqrt{s_{\mathrm{NN}}}=200$ GeV at RHIC using a hydrodynamic model framework and compare the results with those obtained from unclustered carbon and gold collisions. The slope of the thermal photon spectra is found to vary moderately for different orientations of collisions. However, we find that the elliptic ($v_2$) and triangular flow ($v_3$) coefficients of direct photons for specific configurations are significantly larger and predominantly formed by the QGP radiation. A strong anti-correlation between initial spatial ellipticity and triangularity is observed in an event-by-event framework of $\alpha$-clustered $\mathrm{C}+\mathrm{Au}$ collisions. These special features provide us an opportunity to detect the exotic nature of cluster structure inside carbon nucleus using the photon probe in the future experiments.

arXiv comment10 pages, 10 figures; final published version

References in corpus (70)

• Viscosity Information from Relativistic Nuclear Collisions: How Perfect is the Fluid Observed at RHIC?
• Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
• Collision geometry fluctuations and triangular flow in heavy-ion collisions
• Alpha cluster condensation in 12C and 16O
• Elliptic Flow of Identified Hadrons in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Fluctuating Glasma initial conditions and flow in heavy ion collisions
• Anisotropic transverse flow and the quark-hadron phase transition
• Photon Emission from Quark-Gluon Plasma: Complete Leading Order Results
• Enhanced production of direct photons in Au+Au collisions at sqrt(s_NN)=200 GeV and implications for the initial temperature
• Quark mass thresholds in QCD thermodynamics
• Quantum Monte Carlo calculations of $A=9,10$ nuclei
• Hadronic Production of Thermal Photons
• Creating small circular, elliptical, and triangular droplets of quark-gluon plasma
• Hydrodynamic Models for Heavy Ion Collisions
• Ab Initio Calculations of Medium-Mass Nuclei with Normal-Ordered Chiral NN+3N Interactions
• Analysis of previous microscopic calculations for second $0^{+}$ state in ${}^{12}$C in terms of 3-alpha particle Bose-condensed state
• Direct photon production in Pb-Pb collisions at $\sqrt{s_\rm{NN}}$ = 2.76 TeV
• A new critical study of photon production in hadronic collisions
• Topology studies of hydrodynamics using two particle correlation analysis
• Event-by-event hydrodynamics and elliptic flow from fluctuating initial state
• Conformal anomaly as a source of soft photons in heavy ion collisions
• Antinuclei in Heavy-Ion Collisions
• Next-to-leading order thermal photon production in a weakly coupled quark-gluon plasma
• Giant Dipole Resonance as a Fingerprint of $\alpha$ Clustering Configurations in ${}^{12}$C and ${}^{16}$O
• Fluctuating flow angles and anisotropic flow measurements
• Linear and cubic response to the initial eccentricity in heavy-ion collisions
• Thermodynamics of hot strong-interaction matter from ultrarelativistic nuclear collisions
• $v_4$, $v_5$, $v_6$, $v_7$: nonlinear hydrodynamic response versus LHC data
• Azimuthally anisotropic emission of low-momentum direct photons in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Jets, Mach cone, hot spots, ridges, harmonic flow, dihadron and $\gamma$-hadron correlation in high-energy heavy-ion collisions
• Parameterization of Deformed Nuclei for Glauber Modeling in Relativistic Heavy Ion Collisions
• Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma
• QGP formation time and direct photons from heavy ion collisions
• Electromagnetic radiation by quark-gluon plasma in magnetic field
• Inelastic form factors to alpha particle condensate states in 12C and 16O: what can we learn ?
• Anisotropic flow of thermal photons as a quark-gluon plasma viscometer
• Signatures of alpha clustering in light nuclei from relativistic nuclear collisions
• Mach cone induced by $\gamma$-triggered jets in high-energy heavy-ion collisions
• Anisotropic flow and jet quenching in ultra-relativistic U+U collisions
• Elliptic flow of thermal photons from event-by-event hydrodynamic model
• The Glasma, Photons and the Implications of Anisotropy
• Viscous Hydrodynamics and the Quark Gluon Plasma
• Implications of space-momentum correlations and geometric fluctuations in heavy-ion collisions
• Nuclear cluster structure effect on elliptic and triangular flows in heavy-ion collisions
• Thermal photon $v_2$ with slow quark chemical equilibration
• Symmetric cumulants and event-plane correlations in Pb+Pb collisions
• Direct photon elliptic flow in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Dipole oscillation modes in light $\alpha$-clustering nuclei
• Signatures of $\alpha$ clustering in ultra-relativistic collisions with light nuclei
• Alpha clusters and collective flow in ultra-relativistic carbon - heavy nucleus collisions
• Photonuclear reaction as a probe for $\alpha$-clustering nuclei in the quasi-deuteron region
• Effect of magnetic field on the photon radiation from quark-gluon plasma in heavy ion collisions
• Holographic Photon Production in Heavy Ion Collisions
• Influence of initial fluctuations on geometry measures in relativistic U-U and Cu-Au collisions
• Hydrodynamic flow in small systems, or: "How the heck is it possible that a system emitting only a dozen particles can be described by fluid dynamics?"
• A flow paradigm in heavy-ion collisions
• Direct photons from relativistic heavy-ion collisions
• Probing Early-Time Dynamics and Quark-Gluon Plasma Transport Properties with Photons and Hadrons
• Probing the early-time dynamics of relativistic heavy-ion collisions with electromagnetic radiation
• Two-proton momentum correlation from photondisintegration of $\alpha$-clustering light nuclei in the quasi-deuteron region
• Towards detailed tomography of high energy heavy-ion collisions by $\gamma$-jet
• Collective flows of $\alpha$-clustering ${}^{12}\mathrm{C}$ + ${}^{197}\mathrm{Au}$ by using different flow analysis methods
• The roles of deformation and orientation in heavy-ion collisions induced by light deformed nuclei at intermediate energy
• Anisotropic flow of thermal photons at RHIC and LHC
• Spectra and elliptic flow of thermal photons from full overlap U+U collisions at RHIC
• Effect of initial-state nucleon shadowing on the elliptic flow of thermal photons
• Directed flow of photons in Cu+Au collisions at RHIC
• Direct photon spectrum and elliptic flow produced from Pb+Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV at the CERN Large Hadron Collider within an integrated hydrokinetic model
• Photon spectra and anisotropic flow in heavy ion collisions at the top RHIC energy within the integrated hydrokinetic model with photon hadronization emission
• Transverse Spectra of Hadrons in Central $AA$ Collisions at RHIC and LHC from pQCD+Saturation+Hydrodynamics and from pQCD+Energy Losses

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• Ratio of photon anisotropic flow in relativistic heavy ion collisions
• Mean free path of photons in relativistic heavy ion collisions
• Production and anisotropic flow of thermal photons in collision of $\alpha$-clustered carbon with heavy nuclei at relativistic energies
• $\alpha$ + core structure described with an additional interaction in the nuclear matter saturation region
• Hydrodynamic model of heavy-ion collisions with low momentum components