SPIN PHYISICS at FAIR F. Bradamante J-PARC WORKSHOP, KEK November 30, 2005.

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

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xfxfexgxge

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a 2

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1

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)()(

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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