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SPIN PHYISICS at FAIR
F. Bradamante
J-PARC WORKSHOP, KEK November 30, 2005
F. Bradamante J-PARC Workshop
Generalized Parton DistributionsGeneralized Parton Distributions
F. Bradamante J-PARC Workshop
50 MeV Proton Linac
SIS18 booster per protoni - 1 GeV
Sincrotrone a doppio anello per• accelerare p a 28 GeV per targhetta di produzione
• accelerare antip da 3 GeV per trasferirli a HERS
• con SIS300 (anti)p a piu’ di 40 GeV
Collector Ring
NERSraffreddamento stocastico antip
FAIR
High Energy Sorage Ring
F. Bradamante J-PARC Workshop
Physics with Polarized Antiprotons at GSI
ASSIA LoI
• SIS300 @ GSI: ppbar > 40 GeV
• Physics objectives:
• Drell-Yan di-lepton production transversity
• spin observables in hadron production
• electromagnetic form factors
PAX LoI
F. Bradamante J-PARC Workshop
Drell-Yan: the asimmetries depend only on the PDF’s in SIDIS they are convoluted with spin dependent fragmentation functions (*)
antiprotons: only valence quark contribute in proton-proton sea quarks also
(*) only SIDIS allows for flavour separation
Drell-Yan Di-Lepton Production Xμμpp cinematica
q2P
Mx
1
2
1
xxx 21F
q2P
Mx
2
2
2
s
Mτ
2
21xx 0QM 22
μμ
F. Bradamante J-PARC Workshop
a 2
a
11
a
1
2
a
a 2
a
11
a
1
2
a
LL)()(
)()(
xfxfexgxge
A
a 2
a
11
a
1
2
a
a 2
a
11
a
1
2
a2
2
TT)()(
)()(
θcos1
θcos2φsin
xfxfexhxhe
A
a 2
a
11
a
1
2
a
a 2
a
11
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L2
a
T21
a
1
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22LT)()(
)()(1-)()(
Q
M
θcos1
cosφ 2sin2θ
xfxfe
xhxhxxgxxgeA
Drell-Yan AsymmetriesBeam and target polarized
F. Bradamante J-PARC Workshop
ASSIA Collaboration + Novosibirsk (Y. Shatunov et al.) investigations of possible machine options to have polarized
proton - antiproton collisions at sufficiently high energies• symmetric collider (15 GeV + 15 GeV)• asymmetric collider (3.5 GeV + 3.5 GeV)
• feasibility study of part of the program at PANDA• simulations studies for the Drell-Yan process
PAX• apparatus studies
• studies on the polarizability of the antiprotons: proposed measurements at COSY and at AD
Spin Physics at FAIR
work in progress towards aSpin Experiment with AntiProtons (SEAP)
in parallelo a PANDA
F. Bradamante J-PARC Workshop
SEAP IP
F. Bradamante J-PARC Workshop
F. Bradamante J-PARC Workshop
Transverse Structure Functions (Drell-Yan)
30 GeV/c
15 GeV/c
40 GeV/c
= const: hyperbolae
xF = const: diagonal
PANDA (GSI)
ASSIA (GSI)
COMPASS
Phase space