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12TH INTERNATIONAL SYMPOSIUM ON HIGH
ENERGY SPIN PHYSICS
ROUND TABLE 1: THE GLUON SPIN DISTRIBUTION
Following a suggestion of Vernon Hughes there will be a round-table session
during the SPIN96 symposium, devoted to the study of the gluon polarization.
This session is open to all participants, of course. All plans, ideas, etc.
are welcome, certainly those from HERA-N, COMPASS, RHIC. The session is
scheduled on Friday afternoon, following the parallel sessions, from 17:30
until 19:00. All suggestions for contributions, discussion format, etc.
should be directed to Vernon Hughes (vernon.hughes@yale.edu).
Tentative Agenda
1. Definition of polarized gluon distribution Delta G(x,Q^{2}), including
scheme dependence; Delta G from g_{1} using PQCD. (S. Forte, Torino).
2. Determination of Delta G from semi-inclusive processes, both lepton
and proton induced with emphasis on the theoretical assumptions
(J. Collins, Penn State and CERN).
3. Delta G and nucleon angular momentum (X. Ji*, Maryland)
4. HERA: (H. DeRoeck, DESY) + (Deshpande, Yale)
5. COMPASS (G. Mallot, Mainz)
6. SLAC (R. Arnold, SLAC and American University)
7. RHIC Spin (G. Bunce, BNL)
8. HERA-N. (W.-D. Nowak, DESY, Zeuthen)
9. NLC (Polarized; Snowmass) (E. Hughes, CIT)
There will be in parallel to the above a separate informal Round Table
dedicated to the theoretical
problems of RAMPEX, a new spin experiment at 70 GeV/c in Protvino.
The round table will discuss topics relevant to the experiment, and
deals with Twist-3 asymmetries in hard production processes and
Twist-2 asymmetries in polarized proton on proton collisions. All
correspondence should be directed to Yuri Arestov (arestov@mx.ihep.su).
Tentative Agenda
RAMPEX is a new spin experiment which is being planned at 70 GeV/c in Protvino.
The RAMPEX proposal has passed the first aproval, and the final aproval
is expected in the end of September this year. The start is being planned
in 1997. So this is a 'hot' experiment, and we hope the results on
one-spin asymmetries will come soon.
However a number of serious theoretical problems arise which are specific
for HADRON production in reactions p + p_pol --> hadron + X and p + p_pol
--> h1 + h2 + X :
- factorization theorem;
- twist-3 and twist-2 phenomenology for hadron production;
- how to extract chiral-odd structure functions h_L(x) and h_1(x) ?
- Collins effect;
- handedness;
- other ideas.
On Sept. 9 the list of speakers at the Round Table looks as follows:
1. Anatolii Efremov (Dubna): Problems and some approaches
in hadron spin physics.
2. Mauro Anselmino (INFN): Single spin asymmetries
3. Gordon Ramsey (Loyola & ANL): A_N and A_NN at high p_T.
4. Piet Mulders (Amsterdam): *
5. Anatolii Efremov (Dubna): Handedness
6. Meng Ta-chung (Berlin): Diffractive processes in single-spin hh collisions.
7. Sandro Bravar (INFN): Transverse spin effects at large x_F.
8. Sergei Goloskokov (Dubna): Diffractive QQbar
9. Sergei Troshin (Protvino): *
10. Oleg Teryaev (Dubna): One-spin asymmetry in hard subprocesses.
11. Wolf-Dieter Nowak (DESY): One-spin asymmetry at HERA-N
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