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Chief Scientist Laboratories Radiation Laboratory

Chief Scientist: Hideto Enyo (D.Sci.)

Research Summary

Hideto  Enyo(D.Sci.)

Nucleons, such as protons and neutrons, are a bound state of constituent quarks glued together with gluons. The detail structure of nucleons, however, is not well understood yet. Especially the mechanism to build up the spin of proton, which is 1/2, is a major problem in physics of the strong force. The research goal of Radiation Laboratory is to solve this fundamental question using the world first polarized-proton collider, realized at RHIC in Brookhaven National Laboratory (BNL) in USA. RHIC stands for Relativistic Heavy Ion Collider, aiming also to create Quark Gluon Plasma, the state of Universe just after the Big Bang. RIKEN-BNL Research Center (RBRC) carries our core team at BNL for those exciting researches using the PHENIX detector. We have measured fractions of the proton spin carried by gluons and anti-quarks in the proton. Other than the activities at RHIC we are performing new experiments at J-PARC and Fermilab to study the nature of hadron. We are also performing technical developments such as novel ion sources and fine-pitch silicon pixel detectors.

Main Research Fields

  • Mathematical & Physical Sciences

Keywords

  • Hadron physics
  • Chiral symmetry
  • Nucleon structure
  • quark gluon plasma
  • 1. RHIC-f Collaboration (M.H. Kim et al.).:
    "Transverse single-spin asymmetry for very forward neutral pion production in polarized p+p collisions at s√=510 GeV"
    arXiv:2003.04283, to appear in Phys. Rev. Lett.
  • 2. PHENIX Collaboration (C. Aidala et al.).:
    "Nuclear Dependence of the Transverse Single-Spin Asymmetry in the Production of Charged Hadrons at Forward Rapidity in Polarized p+p, p+Al, and p+Au Collisions at √sNN =200 GeV"
    Phys.Rev.Lett. 123 (2019) no.12, 122001
  • 3. PHENIX Collaboration (A. Adare et al.).:
    "Cross section and longitudinal single-spin asymmetry AL for forward W±→μ±ν production in polarized p+p collisions at s√=510 GeV"
    Phys.Rev. D98 (2018) no.3, 032007
  • 4. PHENIX Collaboration (C. Aidala et al.).:
    "Nuclear Dependence of the Transverse-Single-Spin Asymmetry for Forward Neutron Production in Polarized p+A Collisions at √sNN=200 GeV"
    Phys.Rev.Lett. 120 (2018) no.2, 022001
  • 5. PHENIX Collaboration (A. Adare et al.).:
    "Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p+p collisions at√s =510 GeV"
    Phys.Rev. D93 (2016) 1, 011501
  • 6. PHENIX Collaboration (A. Adare et al.).:
    "Charged-pion cross sections and double-helicity asymmetries in polarized p+p collisions at √s =200 GeV"
    Phys.Rev. D91 (2015) 3, 032001
  • 7. PHENIX Collaboration (A. Adare et al.).:
    "Measurement of transverse-single-spin asymmetries for midrapidity and forward-rapidity production of hadrons in polarized p+p collisions at s√=200 and 62.4 GeV"
    Phys.Rev. D90 (2014) 1, 012006
  • 8. PHENIX Collaboration (A. Adare et al.).:
    "Inclusive cross section and single transverse spin asymmetry for very forward neutron production in polarized p+p collisions at sqrt{s}=200 GeV"
    Phys.Rev. D88 (2013) 3, 032006
  • 9." PHENIX Collaboration (A. Adare et al.).:
    "Cross sections and double-helicity asymmetries of midrapidity inclusive charged hadrons in p+p collisions at sqrt{s}=62.4 GeV"
    Phys.Rev. D86 (2012) 092006
  • 10. PHENIX Collaboration (A. Adare et al.).:
    "Cross Section and Parity-Violating Spin Asymmetries of W+- Boson Production in Polarized p+p Collisions at sqrt(s)=500 GeV"
    Phys. Rev. Lett. 106, 062001 (2011)

Lab Members

Principal investigator

Hideto Enyo
Chief Scientist

Contact Information

2-1 Hirosawa,
Wako, Saitama
351-0198, Japan
Email: enyo [at] riken.jp

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