skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Beam-Energy Dependence of Directed Flow of Λ , Λ ¯ , K ± , K s 0 , and ϕ in Au + Au Collisions

Journal Article · · Physical Review Letters
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; « less

Here, rapidity-odd directed flow measurements at midrapidity are presented for Λ, $$\bar{Λ}$$, K±, K$$0\atop{s}$$ and Φ at √sNN = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4 and 200 GeV in Au+Au collisions recorded by the STAR detector at the Relativistic Heavy Ion Collider. These measurements greatly expand the scope of data available to constrain models with differing prescriptions for the equation of state of quantum chromodynamics. Results show good sensitivity for testing a picture where flow is assumed to be imposed before hadron formation and the observed particles are assumed to form via coalescence of 3 constituent quarks. Lastly, the pattern of departure from a coalescence-inspired sum-rule can be a valuable new tool for probing the collision dynamics.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of Illinois, Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; AC02-05CH11231; FG02-94ER40865
OSTI ID:
1419709
Alternate ID(s):
OSTI ID: 1413944; OSTI ID: 1425132; OSTI ID: 1435121; OSTI ID: 1665931; OSTI ID: 1665951
Report Number(s):
BNL-114723-2017-JA; BNL-203293-2018-JAAM; DOE-UIC-ER40865-X3; DOE-UIC-ER40865-X18; PRLTAO; 062301
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 120 Journal Issue: 6; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

References (42)

Directed flow indicates a cross-over deconfinement transition in relativistic nuclear collisions journal February 2015
Composite particle production in relativistic Au+Pt, Si+Pt, and p +Pt collisions journal June 1994
Global collective flow in heavy ion reactions from the beginnings to the future journal November 2014
Flow study in relativistic nuclear collisions by Fourier expansion of azimuthal particle distributions journal May 1996
Microscopic models for ultrarelativistic heavy ion collisions journal January 1998
Examination of directed flow as a signal for a phase transition in relativistic nuclear collisions journal May 2014
STAR detector overview
  • Ackermann, K. H.; Adams, N.; Adler, C.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3 https://doi.org/10.1016/S0168-9002(02)01960-5
journal March 2003
The STAR time projection chamber: a unique tool for studying high multiplicity events at RHIC
  • Anderson, M.; Berkovitz, J.; Betts, W.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3 https://doi.org/10.1016/S0168-9002(02)01964-2
journal March 2003
The phase transition to the quark-gluon plasma and its effect on hydrodynamic flow journal June 1995
Parton/hadron dynamics in heavy-ion collisions at FAIR energies journal January 2015
Observation of an Energy-Dependent Difference in Elliptic Flow between Particles and Antiparticles in Relativistic Heavy Ion Collisions journal April 2013
Examination of directed flow as a signature of the softest point of the equation of state in QCD matter journal September 2016
The First Moment of Azimuthal Anisotropy in Nuclear Collisions from AGS to LHC Energies journal January 2016
Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions journal August 2005
Coalescence of complex fragments journal February 1985
Final-State Interactions in the Production of Hydrogen and Helium Isotopes by Relativistic Heavy Ions on Uranium journal September 1976
Directed Flow at Midrapidity in Heavy-Ion Collisions journal March 2011
Elliptic flow of identified hadrons in Au+Au collisions at s NN = 7.7 –62.4 GeV journal July 2013
Directed Flow of Identified Particles in Au + Au Collisions at S N N = 200 GeV at RHIC journal May 2012
Constituent quark scaling violation due to baryon number transport journal October 2011
Hydrodynamic Models for Heavy Ion Collisions journal November 2006
Deuterons from High-Energy Proton Bombardment of Matter journal January 1963
Production of pions and light fragments in 0.8 A GeV La+La collisions journal September 1988
Composite particle emission in relativistic heavy ion collisions journal July 1979
The Beam-Beam Counter: A Local Polarimeter at STAR conference January 2008
Erratum: Observation of the antimatter helium-4 nucleus journal June 2011
Directed flow in Au+Au collisions at s NN = 62.4 GeV journal March 2006
Light Fragment Production and Power Law Behavior in Au + Au Collisions journal April 1995
Elliptical Flow: A Signature for Early Pressure in Ultrarelativistic Nucleus-Nucleus Collisions journal March 1997
Examination of the directed flow puzzle in heavy-ion collisions journal July 2014
Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions journal April 2014
Methods for analyzing anisotropic flow in relativistic nuclear collisions journal September 1998
System-Size Independence of Directed Flow Measured at the BNL Relativistic Heavy-Ion Collider journal December 2008
Equation of state dependence of directed flow in a microscopic transport model journal June 2017
Coalescence Models for Hadron Formation from Quark-Gluon Plasma journal November 2008
A single Time-of-Flight tray based on multigap resistive plate chambers for the STAR experiment at RHIC
  • Bonner, B.; Chen, H.; Eppley, G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 508, Issue 1-2 https://doi.org/10.1016/S0168-9002(03)01347-0
journal August 2003
Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions at s N N = 7.7 62.4 GeV journal January 2016
Flow analysis with cumulants: Direct calculations journal April 2011
Triangularity and dipole asymmetry in relativistic heavy ion collisions journal June 2011
Relativistic hadron-hadron collisions in the ultra-relativistic quantum molecular dynamics model journal September 1999
Anisotropy as a signature of transverse collective flow journal July 1992
Collective flow signals the quark–gluon plasma journal March 2005