Transverse Spin Physics at RHIC II M. Grosse Perdekamp University of Illinois and RIKEN BNL Research Center QCD N06 , June 12 - 16, 2006, Rome, Italy o Strong Interaction Physics at BNL RHIC RHIC II e-RHIC o RHIC II Luminosity and Detector Upgrades Overview of the Physics Program o Transverse Spin Physics Collins and Interference Fragmentation Drell Yan STAR STAR pp2pp pp2pp
STAR. Transverse Spin Physics at RHIC II. Strong Interaction Physics at BNL RHIC RHIC II e-RHIC RHIC II Luminosity and Detector Upgrades Overview of the Physics Program Transverse Spin Physics Collins and Interference Fragmentation - PowerPoint PPT Presentation
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Transverse Spin Physics at RHIC II M. Grosse Perdekamp
University of Illinois and RIKEN BNL Research Center
QCD N06 , June 12 - 16, 2006, Rome, Italy
o Strong Interaction Physics at BNL
RHIC RHIC II e-RHIC
o RHIC II
Luminosity and Detector Upgrades Overview of the Physics Program
RHIC II: Transverse Spin Physics High Rate (N) Experiment
Transverse Spin Physics at RHIC II 9 June 16th
T-SPHINX
RHIC II: Transverse Spin Physics High Rate (N) Experiment
Large acceptance Drell Yan experiment:
(1) 100 % Transverse Spin x 4 (2) Large acceptance -3<η<+3 x 8 (3) Electron cooling x 2.5 (4) Mini-quads x 4 ~300Physics: Sivers-, Transversity-, Boer-Mulder-distributions in Drell Yan lepton pair production at RHIC.
Relative gain in ∫LdtCompared to PHENIX
Transverse Spin Physics at RHIC II 10
June 16th
Luminosity upgrade
High statistics Au-Au, 500 GeV pp RHIC II
RHIC II Schedule: Detector Upgrades + Luminosity
Transverse Spin Physics at RHIC II 11
June 16th
RHIC II Science Workshops: Spin Physics
Transverse spin physics: S. Menzel (Bochum), L. Gamberg (Penn State), J. Soffer (Marseille), M. Burkardt (New Mexico), F. Yuan (RBRC), M. Radici (Pavia)
Hyperons : Z. Liang (Shandong), Q. Xu (Shandong+LBL), K. Sudoh (KEK)
W-physics: P. Nadolsky (Argonne), K. Sudoh (KEK), J. Soffer (Marseille)
Beyond the SM: J. Soffer (Marseille), D. Maitre (Zurich)
BNL, October 7-8, 2005
Science at RHIC II report: Summer 2006
Transverse Spin Physics at RHIC II 12
June 16th
Physics Channels for RHIC II
Precision measurement of the proton helicity structure
o ∆G(x) and ∆q(x), ∆q(x) with high luminosity in multiple channels with available detector upgrades. Extend measurements to 3He neutron. (can this be done with high polarization + intensity??) minimize errors and increase x-coverage of ∆G(x) for precision measurement of the first moment of the spin-dependent gluon distribution ∆G=ʃ ∆G(x)dx.
observe scale evolution of the first moment.
global QCD analysis for best knowledge of polarized nucleon structure + pdfs
o Measure cross sections in direct photon production, inclusive jet + hadron production as input to QCD analysis to improve knowledge of
G(x) at large x Gluon fragmentation function
(RHIC II Spin Working Group, E. Sichterman, M. Stratmann, MGP, et al.)
Transverse Spin Physics at RHIC II 13
June 16th
Physics Channels for RHIC II
Polarization of the strange sea o Access ∆s(x) through inclusive anti-Lambda production and charm associated W-production (very luminosity hungry!) study polarization of the strange sea verify ∆s from DIS
Transverse Spin Physics o Extract transversity quark distributions from precision measurements of asymmetries in Collins- and interference fragmentation. o Measure transversity-, Sivers- and Boer-Mulders asymmetries in Drell Yan. AN in direct photon and W production.
Transverse Spin Physics at RHIC II 14
June 16th
Transversity from Interference Fragmentation(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
Transverse Spin Physics at RHIC II 15
June 16th
Projected statistical errors in one invariantmass bin 800 MeV < m < 950 MeV
Integrated Luminosity for RHIC II ~ 125 pb-1
pair vsAsymmetry on iesUncertaint Tp
1%
2%
IFF from BelleAT from STAR+PHENIX
Transverse Spin Physics at RHIC II 16
June 16th
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
Drell Yan Physics with T-SPHINX
)()( 21 xqxqATT
M
SkPkxfxqA PTq
TT
)ˆ(
),()( 2211
M
SkPkxh
M
SkPkxhN qqqq
)ˆ(),(
)ˆ(),()( 2
212
11
Transverse Spin Physics at RHIC II 17
June 16th
Sivers-Asymmetries, AT in Drell Yan (J. Collins et al.)
Sensitivity to anti-quark Sivers distribution (not probed at GSI)
Sensitivity to sign with respect to DIS!
Transverse Spin Physics at RHIC II 18
June 16th
Sivers-Asymmetries, AT in Drell Yan (J. Collins et al.)
STAR for 125pb-1
T-SPHINX1250 pb-1
o 10 o’clock 100% transverse polarization
o mini-quads
o acceptance: -3 < η < 3
x 300 in ∫Ldt
AT
Q=4GeV Q=20GeVQ=4GeV Q=20GeVAT
Precision measurement of Sivers distributions!
Transverse Spin Physics at RHIC II 19
June 16th
Projections for pp at 200 GeV and 1250 pb-1
ATT for Drell Yan with dedicated DY detector
projections for 1250pb-1 of running,5-10% higher polarization, with RHIC II luminosities and large acceptance
Drell Yan1.25fb-1, large acceptance detector for Drell Yan
This measurement appears to bealso possible at 500 GeV
Transverse Spin Physics at RHIC II 20
June 16th
RHIC II Summary
o Precision measurements of asymmetries in Collins- and Interference-Fragmentation to map out quark transversity distributions.
o Drell Yan
AT (a) STAR can test expected sign change for the Sivers function at low invariant mass.
(b) Dedicated DY experiment possible to extract Sivers quark distribution. Sensitive to anti- quark distributions!
ATT Clean measurement of anti-quark and possibly quark transversity distributions