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M E M O R A N D U M
TO: Distribution
FROM: B. Mecking
SUBJECT: Hall B Upgrade Meeting Notes
DATE: 22-April-1998
MINUTES OF THE 17-APRIL-1998 HALL B UPGRADE MEETING
Present: V. Burkert, M. Ito, D. Jenkins, F.-J. Klein, B. Mecking,
M. Mestayer, G. Mutchler, and S. Stepanyan
Volker Burkert led a discussion of the physics program that will likely be
important at energies around 10 GeV. The labeling and the order of the topics
follow the table that had been put together for the 1995 NSAC Long Range Plan
discussions.
1. Hadron Microscopy
pi, K, nucleon form factors etc.
experiments mainly done in Halls A and C
B can contribute in areas like
- meson transition form factors like
omega -> pi-zero + virtual photon
A2 -> rho + pi, rho + eta(')
- virtual Compton scattering, especially large energy transfer to the
photon, use of polarized electrons?
- Compton scattering of real photons
2. Spin Microscopy
- measure higher moments, i.e. determine the integral g(x,Q**2),*(x**n),
high x is important
- flavor tagging of polarized spin structure functions
semi-inclusive reactions, detect pi, K, vector mesons, polarized
Lambda's and Sigmas's
(ideal for Hall B)
3. Gluon and s s-bar Spectroscopy
Exotic mesons: need to look at final states like b1 + pi, eta + pi,
eta' + pi
neutral particle detection difficult for Hall B, leave to Hall D
Hall B to concentrate on charged particle channels
4. Nuclear Microscopy
Single-nucleon knock-out: leave to Halls A and C
Hall B to concentrate on
- multi-nucleon knock-out
- N* production and propagation in nuclei
Color Transparency
nuclear vector meson production
5. Meson Decays
Need high production rates to compete
Already produce large numbers of eta's and Phi's in electron scattering in
CLAS at a luminosity of 10**34
May be able to use forward electron detection for quasi-real photon
tagging
Advantages:
- much higher real/accidental ratio than for tagged bremsstrahlung (only
detect electrons that have produced hadrons!)
- can take advantage of small beam spot size and small target length
-> small primary interaction volume
-> small probability for secondary interactions
6. Hadronization
Test models (e.g. string model) for struck quarks recombining into hadrons
Experimental requirements similar to semi-inclusive reactions
Next upgrade meeting:
Friday, 24-April-1998 9:30 - 10.50 a.m. (Seminar at 11:00 a.m.)
Trailer City Room 84
Distribution: CLAS Collaboration
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