future opportunities in transverse spin physic at rhic

Future Opportunities inTransverse Spin Physic at RHIC

o Strong Interaction Physics at BNL

RHIC e-RHIC

o RHIC from present to future

Detector Upgrades Overview of the Physics Program

o Transverse Spin Physics Collins and Interference Fragmentation Sivers Drell Yan

STARSTAR

pp2pppp2pp

Matthias Grosse-Perdekamp, Univ. Illinois Les Bland, Brookhaven National Laboratory

Future Transverse Spin at RHIC 2 June 15 th

RHIC, nowRHIC, futuree-RHIC

o Quark Matter at high Temperatures and Densities

ion-ion collisions (Cu-Cu, Au-Au: √sNN=22.5, 62, 130, 200 GeV)

o Proton Spin Structure

polarized proton-proton collisions (p-p: √s=62.4, 200, 500 GeV) o Low-x and high parton densities

ion-deuteron collisions (d-Au: √sNN=200 GeV)

Strong Interaction Physics at

very active field: > 90 PRL letters in the first 6 years

10 x higher luminosity, detector upgrades

∫RHICLdt 2 fb-1, high luminosity transverse spin running?

(high luminosity) forward detector upgrades

polarized e-p

e-A scattering

RHIC Run 6 Performance100 x 100 Gev pp RUN05-06, PHENIX Integrated Luminosity

(final delivered)

0

5

10

15

20

25

30

35

40

45

0 7 14 21 28 35 42 49 56 63 70 77 84 91

PHENIX Days in Physics mode

Inte

gra

ted

Lu

min

osi

ty (

pb

-1)

RUN05

RUN06

60% beam polarization and 1MHz interaction rate


Luminosity Projection (no mini-quads)

Expect polarization of 70% and luminosity of

s = 200 GeV 100 pbin 10 week run

s = 500 GeV 250 pbin 10 week run

http://spin.riken.bnl.gov/rsc/report/RHIC_spin_LRP07.pdf


• Factor 2-3 increase in pp luminosity

• Improvement in ratio of recorded/delivered luminosity (vertex)

• Small improvements in polarization

• Polarized 3He2+ or polarized d beams may be possible

• Maximum energy √s = 650 GeV

• Mini-quads at the IRs might provide additional increase in luminosity.

Expectations for Future RHIC Operations


Some Issues

• delivered versus recorded integrated luminosity

• luminosity monitoring at high luminosity

• s200 GeV versus s=500 GeV collisions

• longitudinal versus transverse polarization collisions

More, later…


RHIC: Upgrades in STAR and PHENIX

FMS (Forward Meson Spectrometer)

Time of Flight (TOF) HFT (Heavy Flavor Tracker)

Forward Tracking UpgradeDAQ 1000

HBD (Hadron Blind Detector)

Silicon (VTX, FVTX)Muon TriggerForward Calorimeter

Luminosity expectations (example, PHENIX)

∫Ldt ≈ 15 pb-1 2007 ∫Ldt ≈ 85 pb-1 2008 – 2012, √s=200 GeV∫Ldt ≈ 300 pb-1 2008 – 2012, √s=500 GeV∫Ldt ≈ 1300 pb-1 2013 – 2016, √s=500 GeV

Upgrades will be available for most of RHIC spin luminosity! Completed / In Progress / Future


Transverse spin program at RHIC is luminosity limited

AN very good

AN(back-to-back) good

AT (Collins FF) limited

AT (Interference FF) limited

ATT (Jets) not studied

AT (Drell Yan) ---

ATT( Drell Yan) ---

RHIC by 2009 at 200 GeV

∫Ldt ~275pb-1 delivered

∫Ldt ~100pb-1 accepted(eg. PHENIX: vertex cut,trigger efficiencies, dutyfactor)

∫Ldt ~25 pb-1 transverse

Physics channel Luminosity?


Transversity : correlation between transverse proton spin and quark spin

Sivers : correlation between transverse proton spin and quark transverse momentum

Boer/Mulders: correlation between transverse quark spin and quark transverse momentum

Transverse Spin Physics at RHIC with Large ∫Ldt

)()( 21 xqxqATT

M

SkPkxfxqA PTq

TT

)ˆ(

),()( 2211

M

SkPkxh

M

SkPkxhN qqqq

)ˆ(),(

)ˆ(),()( 2

212

11

Collins andInterference FF∫Ldt > 30 pb-1

AT in Drell Yan∫Ldt ~ 250 pb-1

A(φ0) Drell Yan?, not studied

Future Transverse Spin at RHIC 10

June 15 th

Transversity + Tensor Charge from

a Global Analysys of e-p, p-p and e+e-

EIC JLAB,

COMPASS, HERMES,

IFF versity trans

Collins versity trans

SIDIS

ity transversersity transv

:Yan Drell A

GSI

IFF ersity transv

Collins sity transver:Jetsin A

Jets hadrons, inclusivefor A

pp

TT

T

N

TransversityTensor Charge

FF ceInterferen x

FF ceInterferen

Collins x Collins ee -

Lattice QCD: Tensor Charge

Factorization + Universality ?! Belle

RHIC / GSI

Th

eory


June 15 th

Transversity from Inter- ference Fragmentation in pp

(Efremov, Collins, Heppelman, Ladinsky,Atru, Jaffe, Jin, Tan, Radici, Jacob, Bacchetta)

NN

NN

PA

beamT

1

Func.tion Fragmenta Pol.: )(ˆ

quark DFsty Transversi : )(

d Pair Yiel Pion:

zq

xq

N

QCD analysis of Belle IFF and RHICAT in IFF to extract transversity


June 15 th

Projected statistical errors in one invariantmass bin 800 MeV < m < 950 MeV

Projected Errors at for ∫Ldt=125 pb-1 at RHIC

pair vsAsymmetry on iesUncertaint Tp

1%

2%

IFF from BelleAT from STAR+PHENIX

M. Grosse-Perdekamp, RBRC Workshop on Future Transversity Measurements, BNL (2000)


June 15 th

SSA from pions to Drell-Yan

Many issues have already been discussed at this workshop about transverse SSA for inclusive pion production at RHIC.

A future transverse SSA measurement of Drell-Yan at RHIC is possible, with some optimization to the experiments.

But, there is need and opportunity for goals intermediate between inclusive pion and Drell-Yan SSA at RHIC

Large-Rapidity Prompt Photon Transverse SSA


June 15 th

Sample decays on FPD++Run-6 / 6.8 pb-1 / 60% polarization

With FPD++ module size and electronic dynamic range, have >95% probability of detecting second photon from decay.


June 15 th

Where do decay partners go?

• Gain sensitivity to direct photons by making sure we have high probability to catch decay partners• This means we need dynamic range, because photon energies get low (~0.25 GeV), and sufficient area (typical opening angles few degrees at our ranges).

m = di-photon parameters

z = |E1-E2|/(E1+E2)

= opening angle

Mm = 0.135 GeV/c2 ()

Mm=0.548 GeV/c2 ()

mesonfor factor Lorentz of in terms angle opening minimum gives ,1

2sin

yprobabilit with angle opening maximum gives ,1

1

22sin

photon second ofenergy gives ,1

1,Eh photon wit candidatefor

21

2min

2max

2

1

m

m

m

EE

cM

zz

z

E

cM

Ez

zE

E


June 15 th

Single events in “inner” FPD++ cellsPYTHIA 6.222 Simulations

from 0 (Without VETO)

from (Without VETO)

Direct-

E

from 0 (With VETO)

L=0.9 pb-1

3.81010 calls


June 15 th

Sivers in SIDIS vs Drell Yan

• Important test at RHIC of the fundamental QCD prediction of the non-universality of the Sivers effect!

• requires very high luminosity (~ 250pb-1)

Transverse-Spin Drell-Yan Physics at RHIC

L. Bland, S.J. Brodsky, G. Bunce, M. Liu, M. Grosse-Perdekamp, A. Ogawa, W. Vogelsang, F. Yuan

http://spin.riken.bnl.gov/rsc/write-up/dy_final.pdf


June 15 th

Simple QEDexample:

DIS: attractive Drell-Yan: repulsiveSame in QCD:

As a result:

Non-universality of Sivers Asymmetries:Unique Prediction of Gauge Theory !


June 15 th

0.1 0.2 0.3 x

Siv

ers

Am

plitu

de

0

Experiment SIDIS vs Drell Yan: Sivers|DIS= − Sivers|DY

*** Test QCD Prediction of Non-Universality ***

HERMES Sivers Results

Markus DiefenthalerDIS WorkshopMűnchen, April 2007

0

RHIC Drell Yan Projections


June 15 th

Benchmarking Simulationsp+p J/+X l+l+X, s=200 GeV

ee

||<0.35

1.2<||<2.2

J/ is a critical benchmark that must be understood before Drell-Yan

PHENIX, hep-ex/0611020


June 15 th

Dilepton Backgrounds

J/

’ cc bb

Drell-Yan

Isolation needed to discriminate open heavy flavor from DY


June 15 th

Rapidity and Collision Energy

Large rapidity acceptance required to probe valence quark Sivers function


June 15 th

Summary of Transverse SSA Drell-Yan

• 250 pb transverse polarization Drell-Yan data sample probes Sivers function sign relative to SIDIS.

• Isolation required to discriminate low-mass DY from open-heavy flavor.

• Large rapidity will require tracking for charge-sign discrimination.

• Polarized deuteron collisions, with forward spectator tag, could probe flavor dependence.

future opportunities in transverse spin physic at rhic

Documents

bnl rhic erhic rhic

higher luminosity

gev lowx

high temperatures

futureerhic quark matter

detector upgradesrhicldt

interaction ratechart68000

gev pp run05