Stony Brook RHIC Group Overview

Today we’ll tell you about

Who we are & our role in PHENIX (Barbara)Physics focus of the groupPast AchievementsFuture Goals

Synergies between heavy ion & spin And with Theory, Particle Physics and NSL

Spin Program at Stony Brook (Abhay) PHENIX Upgrades activities (Axel) Stony Brook graduate students’ work Tour of our labs (Tom & Abhay)

Heavy Ion Physics Focus

PAST

Jet quenching via inclusive high pT charged hadrons in Au+Au, d+Au

Thermal physics via identified hadron spectra in Au+Au Cronin effect (d+Au)

Charm via single e±

Thermal, charm e+e- pairs

PRESENT

Jet fragmentation fn. Away-jet modification

Energy transport

Baryon-jet correlation

Charm E loss, via single e± to high pT

Thermal via conversions d+Au, AuAu

e+e- pairs

FUTURE

jets as plasma probes multi-particle correlations energy dependence (+LHC)

-jet correlations

Charm via displaced e±

Thermal radiation, charm via low & intermediate mass e+e- pairs

Senior group members

FacultyAxel Drees Tom HemmickBarbara JacakAbhay Deshpande

Research Assistant ProfessorRalf Averbeck

StaffVlad Pantuev (Senior Scientist)Richard Hutter (Technician)

Research supportDOE (group operations)

NSF for Grid research HBD construction at SB

Postdoctoral Fellows

Alberica Toia

Justin Frantz

Heavy Ion Graduate Students

Anne Sickles (PhD→BNL)Jamil Egdemir (PhD→Wake Forest U) Matt NguyenAlan DionTorsten DahmsSarah CampbellHaijiang GongMichael McCumberHarry ThemannJason KaminZvi CitronBill Anderson (MSI)

Summer 2006 Megan JuszkiewiczMatt DurhamNikki Cassano

Spin students Kieran BoyleRob BennettNathan MeansPrasad Hegde

Physics accomplishments before 2005

d Au

Burward-Hoy

Sickles

Matathias

Purwar

Jia

Centrality Dependence

Dramatically different and opposite centrality evolution of AuAu experiment from dAu control.

Showed that jet suppression is clearly a final state effect!

Au + Au Experiment d + Au Control

thesis of J. Jia

d+Au analysisby Jia & Anne Sickles

heavy quarks and jet volcano at QM2005

~ same energy loss for charm & light quarks

energy loss not all radiative also by collisions

theses of J. Edgemir, Sergey Butsyk (run2) & Alan Dion (run4)

Analysis and compilationby Mike McCumber

SB contribution to existing tools

Drift ChamberRICH PMT array

Tracking, Momentum Reconstruction in Central

Arms

Analysis Coordinator!

2006 Run Coordinator

Upgrades Coordinator

PWG Conveners

University Contributions to the Group

2 New York State PositionsPantuev, Frantzcollaborate with Rich Lefferts, Andrzej Lipski on HBD

Lab, clean room, assembly spaceBenefit from Nuclear Structure Lab

Subsidized Electronics and Machine shops$44/hour electronics, $37/hour machine

Matching funds for capital equipmentDrift Chamber FEE, HBD

Strong nuclear theory group (Brown, Shuryak, Zahed Wiedemann) + YITP (Sterman)

Most measurements planned for the future are based on hard scattering Sensitive to gluon or spin structure of nucleons or the nucleus Probe quark or nuclear matter ala “Rutherford experiment” or DIS

Basic processes utilized:Parton-parton scattering: leading h or 0, angular correlations, jet production

Gluon-gluon fusion: open heavy flavor production, quarkonia

Quark-gluon Compton scattering: direct photons and -jet

Spin synergy: Hard Probes for pp & AA

q

qg

g

cg

c

central arms + VTX + HDB/TPC + NCC

central arms + VTX

central arms + VTX + HBD/TPC + NCC

q

gg

q

Example of synergy with theory

Mach cone? Jets may travel faster than the speed of sound in the medium Shock plasma by depositing energy via gluon radiationQCD “sonic boom”

+/-1.23=1.91,4.37 → cs ~ 0.33 (√0.33 in QGP, 0.2 in hadron gas)

dN

/d(

)

studies of strongly coupled plasma S. Ichimaru, Univ. of Tokyo

signal electron

Cherenkov blobs

partner positronneeded for rejection e+

e-

pair opening angle

Full scale prototype

Large acceptance displaced vertex detector( and < 1), < 100 m

D, B → e + hadrons (semi-leptonic decay)

Toward Future Physics at RHIC GEANT model

Strip Detectors (80 m x 3 cm) at R ~ 10 & 14 cm

Hybrid Pixel Detectors (50 m x 425 m) at R ~ 2.5 & 5 cm

||<1.2 ~ 2zcm

e+ e -

e+ e -

Hadron blind detector to reject Dalitz background

~ 1 m

New Future Directions

eRHIC to study e + p and e + A (cold, dense gluonic matter)More from Abhay on this

New faculty search to join ATLAS/heavy ion program

Focus on jet modificationCollaborate with USB particle physics groupMutual interest in jet reconst. and inner trackingFirst planning discussions w/ John Hobbs (USB) US-ATLAS HI collaboration

backups

what is a plasma?

4th state of matter (after solid, liquid and gas) a plasma is:

ionized gas which is macroscopically neutralexhibits collective effects

interactions among charges of multiple particlesspreads charge out into characteristic (Debye) length, D

multiple particles inside this lengththey screen each other

plasma size > D

“normal” plasmas are electromagnetic (e + ions)quark-gluon plasma interacts via strong interaction

color forces rather than EMexchanged particles: g instead of

ideal gas or strongly coupled plasma?

Huge gluon density! estimate = <PE>/<KE>

using QCD coupling strength g<PE>=g2/d d ~1/(41/3T)

<KE> ~ 3T ~ g2 (41/3T) / 3Tg2 ~ 4-6 (value runs with T)

for T=200 MeV plasma parameter

quark gluon plasma should be a strongly coupled plasmaAs in warm, dense plasma at lower (but still high) Tother examples: dusty plasmas in space, cold atoms

such EM plasmas are known to behave as liquids!

> 1: strongly coupled, few particles inside Debye radius