Takao Sakaguchi

Takao Sakaguchi
Physicist

Telephone: (631) 344-3345
Fax: (631) 344-3253
E-Mail: takao@bnl.gov

Experimental high energy nuclear and particle physics.
Particle detectors and their readout electronics.

Research Interests

It has been an extraordinary difficult issue both in experimental and theoretical study to disentangle the processes of confining quarks and gluons, and gaining a hundred times bigger mass than the sum of bare quark masses. The purpose of relativistic heavy ion collisions is to create a bulk matter of deconfined quarks and gluons, Quark Gluon Plasma (QGP) that lattice Quantum Chromo Dynamics (QCD) predicts to exist in sufficiently hot and dense environment, and to study its behavior by applying methods from statistical mechanics. The big advantage of this approach is that it is possible to explore the characteristics of the strong interaction at various energy region including the one where perturbative QCD does not work.

I am particluarly interested in looking at directly radiating probes such as photons or dileptons. High pT hadrons have also been of interest on investigating the "denseness" of the matter created at RHIC.

In addition to the above, I am always enjoying developing a new detection device. The Hadron blind detector at the PHENIX experiment I am heavily involved in is new in the sense that it employs a new electron multiplier, GEM.

Education & Concurrent Positions

1998 D.Sc. Waseda University, Japan
1996 M.Sc. Waseda University, Japan
1994 B.Sc. Waseda University, Japan

2008-present Physicist, Brookhaven National Laboratory
2006-2008 Associate Physicist, Brookhaven National Laboratory
2004-2006 Assistant Physicist, Brookhaven National Laboratory
2001-2004 Research Fellowship, Japan Society for the Promotion of Science
1999-2001 Research Associate, CNS, University of Tokyo
1998-1999 Research Assistant, CNS, University of Tokyo

Selected Publications

Invited Talks and Seminar

"Direct Photon production in relativistic heavy ion collisions", Invited talk for CNS-RIKEN workshop, "Physics of QGP at RHIC", February 16, 2006, Saitama, Japan.

"Electromagnetic probes in relativistic heavy ion collisions", RBRC seminar, January 27, 2006.

"Heavy-ion collisions at RHIC", Invited talk for the symposium of "30 years of QCD ~current status and prospect" as a memorial of 2004 Nobel Prize to QCD theory at JPS Spring meeting, March 25, 2005, Chiba, Japan.

"Measurement of High-pT and Leptonic Observables with the PHENIX Experiment at RHIC", Invited talk for Lake Louise Winter Institute, February, 2003, Lake Louise, Canada.

"Neutral Energy Flow and Jet Suppression", Invited talk at JPS Fall Meeting, September, 2003, Rikkyo University, Japan.

"Lepton and Photon measurement at RHIC-PHENIX", Invited talk for JPS Spring Meeting, March, 2001, Chuo University, Japan.

Selected Physics Publications

S.S. Adler et al. (PHENIX Collaboration), "Centrality dependence of direct photon production in sqrt(s_NN) =200GeV Au + Au collisions", Phys. Rev. Lett. 94, 232301 (2005).

K. Adcox et al. (PHENIX Collaboration), "Formation of dense partonic matter in relativistic nucleus nucleus collisions at RHIC: Experimental evaluation by the PHENIX collaboration", Nucl. Phys. A757 (2005)184.

S.S. Adler et al. (PHENIX Collaboration),"Scaling properties of proton and anti-proton production in sqrt(s_NN)=200 GeV Au+Au collisions", Phys. Rev. Lett. 91, 172301(2003).

S.S.Adler et al. (PHENIX Collaboration), "Suppressed pi0 Production at Large Transverse Momentum in Central Au+Au Collisions at sqrt(s_NN) = 200 GeV", Phys. Rev. Lett. 91, 072301(2003).

T. Sakaguchi for the PHENIX Collaboration, "High pT hadron identified hadron ratios in sqrt(s_NN) =200 GeV Au+Au collisions", Proceedings of Quark Matter 2002, Nucl. Phys. A715(2003)757.

K. Adcox et al. (PHENIX Collaboration), "Suppression of Hadrons with Large Transverse Momentum in Central Au+Au Collisions at sqrt(s_NN) = 130 GeV", Phys. Rev. Lett. 88, 022301(2002).

A. Ihara, T. Sakaguchi et al., "Electron and Ion Spectrometer onboard the Nozomi spacecraft and its initial results in interplanetary space", Astroparticle physics, 17(2002)263-278.

T. Sakaguchi et al., "Measurement of the directional distribution of incident particles in the Shuttle-MIR mission orbit", J. Geophys. Res., Vol. 104, A10(1999)22793.

T. Sakaguchi et al., "LET Distribution Measurement with a new Real time Radiation Monitoring Device-III onboard the Space Shuttle STS-84", Nucl. Instr. and Meth. Phys. Res., A437(1999)75.

T. Sakaguchi et al., "Radiation Dosimetry Measurements with Real Time Radiation Monitoring Device(RRMD)-II in Space Shuttle STS-79", Jpn. J. Appl. Phys., Vol. 36(1997)7453.

Selected Technical Publications

Z. Fraenkel, T. Sakaguchi et al, "A Hadron Blind Detector", Nucl. Instr. & Meth. Phys. Res. A546(2005)466.

M. Aizawa, T. Sakaguchi et al., "PHENIX central arm particle I.D. detectors", Nucl. Instr. Meth., A499(2003)508.

T. Sakaguchi et al., "Development of Front End Electronics for PHENIX RICH", Nucl. Inst. Meth., A453(2000)382.