Future studies of TMDs Delia Hasch SIR05- International Workshop on Semi-inclusive reactions and 3D-parton distributions May 18-20, 2005; Jefferson Lab, Newport News (USA)

object add k T dependent DF :  new class of FF  more …  manifest in azimuthal/SSA ___ Future TMD measurements _________________ SIR05 Workshop on TMDs and GPDs _______ Newport News (USA), transversity

observables ppeeee sidis DY, A TT incl. jets left right A N jet correlations, … A UT (  ±  S ) A UL (  ), A LU (  ) A UU (  ), …  production, VM, …, A LT (  ±  S ) DF FF e-e- e+e+ ___ Future TMD measurements _________________ SIR05 Workshop on TMDs and GPDs _______ Newport News (USA), Collins FF IFF unpol FF

observables  experiments ppeeee (very) far future PAX EIC future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary  Collins effect  Sivers effect  higher twist contributions: left right Fermilab E704: √ s ~20 GeV RHIC: √ s ~200 GeV  map kinematic dependencies x F, P T  hadron ID:   0, K , p with current data set till 2005 (P b =0.5):  new observables to disentangle different mechanism:

A T with 32pb -1 azimuthal back to back correlation between hadrons in opposite hemisphere jets:  clean channel for Sivers effect analysis of jet structure:  isolate Collins effect  2hadron interference DY, inclusive jets:  direct access to h pb -1 P b ≥ pb -1 P b = fb -1 P b ≥ 0.7 silicon tracker FMS future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

TMDs in SIDIS TMDs in SIDIS polarised lepton beam polarised target A UT, A UL, A LU, A LT,… single/double hadron production  production, VM future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

Collins + Sivers effects disentangled ! significant non-zero results    0, K  on the way  weighted asymmetries under study  data taking with transverse target till end 2005: ~0.8∙( ) statistics in 2005 future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

significant non-zero result  add 2005 statistics, A LU on the way future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary transversely polarised target: A UT (  ±  S )  1-hadron production  exclusive: (  -  S )  2-hadron production   polarisation longitudinally polarised target/beam: A LU (  ), A UL (  )  1 or 2 hadron prod. unpolarised: UU  2005: ~7-8M DIS       K         HERMES will run till mid 2007  2000 / 2007       K   2007       K 

future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary results from 2002 data (~1.6M DIS)  ~4∙(2002)  improved trigger for higher x, Q 2  hadron ID with RHIC  ~2∙(2003)

COMPASS:  polarisation COMPASS:  polarisation 2002 statistics high potential for polarisation measurement future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary COMPASS is foreseen to run up to the end of the present mid-term plan of CERN (2010)  2007/08 priority of hadron program 70mrad present acceptance 180mrad 70mrad present acceptance  proton target in 2006: 30 days NH 3 new Compass magnet transversely polarised target: A UT (  ±  S )  1-hadron production  exclusive (  s )  2-hadron production   polarisation longitudinally polarised target/beam: A UL (  ), A LU (  )  1 or 2 hadron prod. unpolarised: UU  2006 (>2008 ?)   0, K  on d,p  0  2006 / (>2008 ?) d/p target * * no analyses yet …

future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary (6 GeV) (6 GeV)  longitudinal target/beam asymmetries from CLAS:  A UL A LU PRELIMINARY IC 424 PbWO4 ……..crystals  high potential for running with transversely polarised target CLAS CLAS+IC

(6 GeV ) (6 GeV )  transverse target polarisation: approved Hall-A with 3 He  neutron projections for 24 days  valence region  small z-range  limited  acceptance future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary (6 GeV ) (6 GeV ) transversely polarised target: A UT (  ±  S )  1-hadron production  exclusive: (  -  S )  2-hadron production   polarisation longitudinally polarised target/beam: A UL (  ), A LU (  )  1 or 2 hadron prod. unpolarised: UU       on n target    2004 / ||   !factorisation tests ! GeV  talks by V. Burkert A. Lung

fragmentation in sidis fragmentation in sidis future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

FF from e + e - FF from e + e - e-e- e+e+ e+e+ e-e-      e-e- e+e+   future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

FF from e + e - FF from e + e - jet production from light quarks sufficiently high scale  pQCD regime: Q 2 ~ 100 GeV 2 not too high energy  A scales lnQ 2  avoid Z-pole √s ~ 10 GeV << M Z KEKB: L >400 fb -1KEKB: L >400 fb -1 e-e- e+e+ first estimate of Collins FF from DELPHI data : A C = 6 – 12 % √s = GeV (Y(4S)) √s = GeV (Y(4S))  off-resonant (60MeV below res.) future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary 10%

FF from e + e - FF from e + e - e-e- e+e+  add  0 : favoured/unfavoured  extension to IFF straight forward  KEK: L~150 fb -1 per year 10% off-resonant  “unlimited” running: KEK  superKEK  FF measurement will be dominated by systematic uncertainties future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

current facilities: near+mid term future current facilities: near+mid term future far future   Collins/2hadron FF with high accuracy and a “dream”  EIC e-e- e+e+ first extraction of TMDs feasible future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

Drell spin-transfer from polarized electrons of the target to antiprotons GSI: M 2 ~10 GeV 2, s~30-50 GeV 2,  =x 1 x 2 =M 2 /s~  exploration of valence quarks (h 1 q (x,Q 2 ) large) RHIC:  =x 1 x 2 =M 2 /s~10 -3  exploration of the sea quark A TT very small (~ 1 %) T=22 GeV (  s=6.7 GeV) T=15 GeV (  s=5.7 GeV) Anselmino et al. PLB 594,97 (2004) x F =x 1 -x 2 future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary Drell experiment:  asymmetric collider: p = 15.0 GeV in HESR p = 3.5 GeV in CSR  internal polarised target with p = 22 GeV 1 yr of data taking

dream: Electron Ion Collider  higher centre of mass energies  specific geometry  angular separation between elm. probe and target fragments future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

polarised electron/positron beam facility to collide with the existing RHIC ions / polarised protons  linac + eRing + RHIC  optional: linac + RHIC 5-10 GeV polarised e  /e  GeV polarised p, light ions luminosity ~ cm -2 s -1 future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

one accelerating & one decelerating pass through CEBAF 3-7 GeV polarised e  GeV polarised p, light ions luminosity ~8∙10 34 cm -2 s -1 future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

Summary TMDs SIDIS  A UT, A UL, A LU, A LT, A UU for single and double hadrons  production, VM COMPASS, HERMES, EIC e  e   CollinsFF, IFF BELLE pp  A N for inclusive hadrons, di-jets  Sivers A T in jets:  Collins FF  IFF A TT inclusive jets, DY BRAHMS, PHENIX, STAR PAX factorisation universality future TMD pp sidis e  e  measurements RHIC PAX HERMES COMPASS JLab EIC BELLE summary

EIC not just a dream… ___ Future experiments: lepton facilities _____________ ECT* International Workshop on Transversity ___ Trento (Italy), “Absolutely Central to the field…” NSAC Long Range Planning document summary; high on R&D recommendation projects. Highest possible scientific recommendation from NSAC Subcommittee February/March 2003, Readiness Index 2  One of the 28 must-do science projects by US DoE in the next 20 years. expected “formal” approval Long Range Review detector design studies ~2008 final design ready ~2010  first collision in ~2015 ?

jet1 jet2 jet axis: thrust e+e+ e-e- e-e- e+e+ e-e- e+e+   e+e+ e-e-     

M invariant Mass of lepton pair RHIC: τ=x 1 x 2 =M 2 /s~10 -3 → Exploration of the sea quark A TT very small (~ 1 %) RHIC : Transverse jet production Large yield, no gluon mixing but need superb systematic control