Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC

Sonia Kabana; Vipul Bairathi; STAR Collaboration

doi:10.1016/J.PHYSLETB.2023.138071

Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC

Título traducido de la contribución: Flujo elíptico de electrones de desintegración de sabor pesado en colisiones Au+Au a √sNN = 27 y 54,4 GeV en RHIC

Sonia Kabana
, Vipul Bairathi
, STAR Collaboration

Instituto de Alta Investigación

Universidad de Tarapacá

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

5 Citas (Scopus)

Resumen

Informamos sobre nuevas mediciones del flujo elíptico (v2) de electrones provenientes de desintegraciones de hadrones de sabor pesado a velocidad media (|y|<0,8) en colisiones Au+Au a sNN = 27 y 54,4 GeV del experimento STAR. Los electrones de desintegración de sabor pesado (eHF) en colisiones Au+Au a sNN = 54,4 GeV exhiben una v2 no nula en la región de momento transversal (pT) de pT< 2 GeV/c con una magnitud comparable a la de sNN=200 GeV. La v2 de eHF medida a 54,4 GeV también es consistente con la expectativa de su hadrón de encanto progenitor v2 siguiendo el escalamiento del número de quarks constituyentes como otros hadrones ligeros y de sabor extraño a esta energía. Estos sugieren que los quarks charm adquieren una colectividad significativa a través de la evolución del medio QCD y podrían alcanzar el equilibrio térmico local en colisiones Au+Au con sNN=54,4 GeV. El valor v² medido en eHF en colisiones Au+Au con sNN=27 GeV es consistente con cero dentro de grandes incertidumbres. La dependencia energética de v² para diferentes partículas de sabor (π, ϕ, D0/eHF) muestra una indicación de la jerarquía de masas de los quarks al alcanzar la termalización en colisiones nucleares de alta energía.

Título traducido de la contribución	Flujo elíptico de electrones de desintegración de sabor pesado en colisiones Au+Au a √sNN = 27 y 54,4 GeV en RHIC
Idioma original	Inglés
Número de artículo	138071
Páginas (desde-hasta)	1-10
Número de páginas	10
Publicación	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volumen	844
DOI	https://doi.org/10.1016/J.PHYSLETB.2023.138071
Estado	Publicada - 10 sep. 2023

Palabras clave

Electrón de desintegración de sabor pesado
Flujo elíptico
Coeficiente de difusión espacial del quark charm

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title = "Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC",

abstract = "We report on new measurements of elliptic flow (v2) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at sNN = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at sNN = 54.4 GeV exhibit a non-zero v2 in the transverse momentum (pT) region of pT< 2 GeV/c with the magnitude comparable to that at sNN=200 GeV. The measured eHF v2 at 54.4 GeV is also consistent with the expectation of their parent charm hadron v2 following number-of-constituent-quark scaling as other light and strange flavor hadrons at this energy. These suggest that charm quarks gain significant collectivity through the evolution of the QCD medium and may reach local thermal equilibrium in Au+Au collisions at sNN=54.4 GeV. The measured eHF v2 in Au+Au collisions at sNN= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v2 for different flavor particles (π,ϕ,D0/eHF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.",

keywords = "Heavy-flavor decay electron, Elliptic flow, Charm quark spatial diffusion coefficient, Electr{\'o}n de desintegraci{\'o}n de sabor pesado, Flujo el{\'i}ptico, Coeficiente de difusi{\'o}n espacial del quark charm",

author = "Sonia Kabana and Vipul Bairathi and \{STAR Collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2023, The Author(s).",

year = "2023",

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day = "10",

doi = "10.1016/J.PHYSLETB.2023.138071",

language = "English",

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journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC. / Kabana, Sonia; Bairathi, Vipul; STAR Collaboration.
En: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 844, 138071, 10.09.2023, p. 1-10.

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

TY - JOUR

T1 - Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC

AU - Kabana, Sonia

AU - Bairathi, Vipul

AU - STAR Collaboration

PY - 2023/9/10

Y1 - 2023/9/10

N2 - We report on new measurements of elliptic flow (v2) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at sNN = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at sNN = 54.4 GeV exhibit a non-zero v2 in the transverse momentum (pT) region of pT< 2 GeV/c with the magnitude comparable to that at sNN=200 GeV. The measured eHF v2 at 54.4 GeV is also consistent with the expectation of their parent charm hadron v2 following number-of-constituent-quark scaling as other light and strange flavor hadrons at this energy. These suggest that charm quarks gain significant collectivity through the evolution of the QCD medium and may reach local thermal equilibrium in Au+Au collisions at sNN=54.4 GeV. The measured eHF v2 in Au+Au collisions at sNN= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v2 for different flavor particles (π,ϕ,D0/eHF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.

AB - We report on new measurements of elliptic flow (v2) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at sNN = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at sNN = 54.4 GeV exhibit a non-zero v2 in the transverse momentum (pT) region of pT< 2 GeV/c with the magnitude comparable to that at sNN=200 GeV. The measured eHF v2 at 54.4 GeV is also consistent with the expectation of their parent charm hadron v2 following number-of-constituent-quark scaling as other light and strange flavor hadrons at this energy. These suggest that charm quarks gain significant collectivity through the evolution of the QCD medium and may reach local thermal equilibrium in Au+Au collisions at sNN=54.4 GeV. The measured eHF v2 in Au+Au collisions at sNN= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v2 for different flavor particles (π,ϕ,D0/eHF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.

KW - Heavy-flavor decay electron

KW - Elliptic flow

KW - Charm quark spatial diffusion coefficient

KW - Electrón de desintegración de sabor pesado

KW - Flujo elíptico

KW - Coeficiente de difusión espacial del quark charm

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DO - 10.1016/J.PHYSLETB.2023.138071

M3 - Article

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VL - 844

SP - 1

EP - 10

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138071

ER -

Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC

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