THEME02-0-1025-98/2008

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02-0-1025-98/2008

Priority:

Status:

In-progress

Study of the Hadron Structure in the Experiments with the COMPASS (NA58) and HERMES (DESY) Spectrometers

Leader:	A.P. Nagajtsev
Scientific leader:	I.A. Savin

Scientific Programme:
- Study of inclusive and semi-inclusive processes in deep inelastic scattering of muons and electrons on polarized and unpolarized targets.

- Search for effects of nucleon strange sea and gluon polarization in the production of

hyperons and charm mesons.

-Determination of the quark spin, gluon and quark orbital momenta contributions to the nucleon spin.

- Sum rule tests for spin-dependent structure functions of the proton and neutron, QCD tests.

- Spectroscopy of charmed hadrons. Primakoff and diffraction processes.

- Measurement new structure functions and DVCS.

- Construction of a hadron calorimeter, a muon system and straw tracking chambers for the COMPASS spectrometer.

- COMPASS software development and support of the CERN program library at JINR.

Expected main results in 2007:

Participation in the COMPASS data taking run.
Support of HCAL1 during 2007 run.
Performance studies of the tracking detectors MWPC, STRAW, W4/5 for COMPASS.
Performance studies of RICH WALL for COMPASS.
Development of the COMPASS and HERMES software and simulations.
Participation in analysis of COMPASS data recorded in 2006 and 2007.
Participation in data taking and analysis with HERMES.
Theoretical studies of spin effects in COMPASS and HERMES.
Implementation of the COMPASS software at JINR.

List of projects:
	Project	Leader	Priority (period of realisation)
1.	COMPASS	A.P. Nagajtsev	1 (1998-2008)
2.	HERMES	V.G. Krivokhijine	1 (1995-2009)

List of Activities

Activity or Experiment

Leader

Status

COMPASS

I.A. Savin

Data taking
Data analysis

Hadron calorimeter

I.A. Savin

Maintenance

Muon system

G.D. Alekseev

Maintenance

Tracking systems

V.D. Peshekhonov
O.Yu. Denisov
V.N. Samoylov
G.D. Alexeev
I.M. Ivanchenko

Maintenance

Monte Carlo simulation
and software preparation

M.G. Sapozhnikov
V.G. Krivokhijine
P.V. Zrelov

Realization

II.

HERMES

V.G. Krivokhijine

Data taking
Data analysis

III.

Theoretical studies

A.V. Efremov

Realization

Collaboration
Country or international organization	City	Institute or Laboratory
Armenia	Yerevan	YerPhI
Belarus	Minsk	NC PHEP BSU
Belgium	Mons	UMH
	Brussels	ULB
Bulgaria	Sofia	INRNE BAS
		SU
Canada	Vancouver	TRIUMF
	Edmonton	U of A
CERN	Geneva
Czech Republic	Prague	CTU
Finland	Helsinki	UH
France	Saclay	SPhN CEA DAPNIA
Germany	Bielefeld	Univ.
	Bochum	RUB
	Bonn	UniBonn
	Freiburg	Univ.
	Hamburg	DESY
	Heidelberg	MPI-K
	Munich	LMU
		TUM
	Mainz	JGU
	Erlangen	FAU
Israel	Tel Aviv	TAU
Italy	Turin	INFN
	Trieste	INFN
	Frascatti	INFN LNF
Japan	Chiba	Toho Univ.
	Nagoya	Nagoya Univ.
	Osaka	OCU
	Sendai	Tohoku Univ.
	Tsukuba	KEK
	Yamagata	Yamagata Univ.
JINR	Dubna	DLNP
		BLTP
		LPP
		LIT
Netherlands	Amsterdam	NIKHEF
Poland	Warsaw	WU
Romania	Bucharest	IFIN-HH
Russia	Moscow	SINP MSU
		LPI RAS
	Protvino	IHEP
	Gatchina	PNPI RAS
	Troitsk	INR RAS
Switzerland	Zurich	Univ.
United Kingdom	Liverpool	Univ.
USA	Argonne, IL	ANL
	Cambridge, MA	MIT
	Boulder, WY	CU
	Pasadena, CA	CALTECH

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