02-0-1085-2009/2023
 
Priority: 1
   
Status: Being concluded 


Studies of the Nucleon and Hadron Structure at CERN
   

Leader:    

A.V. Guskov


Participating countries and international organizations:
CERN, Czech Republic, France, Germany, India, Israel, Italy, Japan, Poland, Portugal, Russia, Taiwan, USA.

Issues addressed and main goals of research:
Studies of the generalized parton distributions in various exclusive processes. Study of the mechanisms of exclusive production of photons, pions and vector mesons in the processes of deep inelastic scattering of muons on nuclei (DIS) and in processes of deep inelastic virtual Compton scattering (DVCS). Measurements of the polarizability of a pion. Study of the structure of nucleons in Drell-Yan processes. Study of inclusive and semi-inclusive processes in DIS reactions of muons and hadrons on polarized targets.
  1. Measurements of the structure functions of a nucleon, polarized parton distributions of nucleons.

  2. Measurements of the structure of nucleons in vuon pair production (Drell-Yan, J/Psi).

  3. Spin effects in hadron interactions at 0.3-3.0~GeV.

  4. Study of the mechanisms of exclusive production of photons, pions and \(\rho\)-mesons in DIS and DVCS processes.

  5. Measurement of the Primakoff reactions cross sections.

  6. Creation and development of a set of programs for modeling and data processing. System support for CERN software.

  7. Preparation of detectors for the COMPASS-II spectrometer.
Expected results in the current year:
  1. Measurement of π0 production in the processes of exclusive deep inelastic scattering of muons on a hydrogen target.

  2. Measurements of Collins and Sivers asymmetry on hydrogen and deuterium targets.

  3. Measurement of semi-inclusive scattering on hydrogen and deuterium targets with 2 gadrons production.

  4. Measurement of transverse spin asymmetries in semi-exclusive scattering processes.

  5. Software development and modeling of vaious reactions studied on the COMPASS-II spectrometer. Analysis of data in JINR and preparation of publications.

  6. Theoretical studies on the program COMPASS-I and COMPASS-II.

  7. Extraction of spin asymmetries from the 2022 run data of Semi-Inclusive Deep-Inelastic Scattering (SIDIS) of muons off transversely polarised 6LiD target.
List of projects:
  Project Leader Priority
(period of realisation)
1. COMPASS-II A.V. Guskov 1   (2011-2023)

List of Activities
  Activity or Experiment Leaders
Status
      Laboratory or other
    Division of JINR
Responsible person
Main researchers
I. Experiment COMPASS-II A.V. Guskov
Data taking
Data analysis
1. Hadron calorimeter O.P. Gavrishchuk
Maintenance
 

VBLHEP

V.A. Anosov

 

DLNP

A.S. Selyunin, A.V. Rybnikov

2. Electromagnetic calorimeter N.V. Anfimov
Maintenance
 

VBLHEP

V.A. Anosov, O.P. Gavrishchuk

 

DLNP

A.I. Antoshkin, A.V.Guskov, V.M. Kudryavtsev, A.G. Olshevskiy, A.V. Rybnikov, A.S. Selyunin, I.E. Tchirikov-Zorin, V.N.Frolov

3. Muon system G.D. Alekseev
Maintenance
 

DLNP

V.M. Abazov, G.A. Golovanov, A.A. Piskun, A.G. Samartsev, V.V. Tokmenin, L.S. Vertogradov, N.I. Zhuravlev

4. System of the data taking V.N. Frolov
Maintenance
     
5. Software devlopment.
Data analysis
E.V. Zemlyanichkina
A.V. Guskov
Realization
 

VBLHEP

R.R. Akhunzyanov, R. Gushcherski, A.V. Ivanov, Yu.I. Ivanshin, O.M. Kuznetsov,  N.S. Rogacheva, D.V. Peshekhonov, I.A. Savin, E.A. Salmina

 

DLNP

N.V. Anfimov, A.I. Antoshkin, A.O. Gridin, I.I. Denisenko, A. Maltsev, A.G. Olshevskiy, A.V. Rybnikov, A.S. Selyunin

 

MLIT

P.V. Zrelov, A.Sh. Petrosyan

6. Measurements of generalized
parton distributions
A.V. Guskov
I.A. Savin
Realization
 

VBLHEP

R.R. Akhunzyanov, R. Guscherski, G.V, O.M. Kuznetsov, N.S. Rogacheva, V.D. Peshekhonov, E.A. Salmina, O.V. Teryaev, E.V. Zemlyanichkina

 

DLNP

I.I. Denisenko, A. Maltsev, A.G. Olshevskiy

 

BLTP

O.V. Teryaev

7. Studies of Drell-Yan processes A.V. Guskov
Realization
 

DLNP

I.I. Denisenko,  A.O. Gridin, A. Maltsev

8. Spin effects in hadron
interactions at 0.3-3.0 GeV
A.V. Kulikov
D.A Tsirkov
Data processing
 

DLNP

T.I. Azaryan, S.N. Dymov, V.I. Komarov, V.S. Kurbatov, Zh. Kurmanaliev, A. Kunsafina, V.V. Shmakov, Yu.N. Uzikov, B.Zh. Zalikhanov

9. Studies of semi-inclusive
reactions
I.A. Savin
E.V. Zemlyanichkina
Realization
 

VBLHEP

A.V.Ivanov, Yu.I. Ivanshin, S.R.Gevorgyan, N.S. Rogacheva, E.A. Salmina

II. Theoretical studies O.V. Teryaev
Realization
  BLTP S.B. Gerasimov, A.V. Kotikov, A.M. Sidorov
III. Exploring fundamental properties of hadrons at AMBER experiment    A.V. Guskov
Realization
  BLTP A.B. Arbuzov, S.G. Bondarenko, V.V. Byt'yev
  DLNP G.D. Alexeev, I.I. Denisenko, V.N. Frolov, A. Gongadze, M.I. Gostkin, A.O. Gridin, N.A. Kovyazina, V.G. Kruchonok, A. Maltsev

 

VBLHEP

V.A. Anosov, O.P. Gavrishchuk, R.I. Gushterski, A.Yu. Korzenev, O.M. Kouznetsov, I.A. Savin, E.V. Zemlyanichkina E.


 Collaboration
Country or International Organization City Institute or Laboratory
CERN Geneva CERN
Czech Republic Brno BUT
  Liberec TUL
  Prague CU
France Saclay SPhN CEA DAPNIA
Germany Bochum RUB
  Bonn UniBonn
  Freiberg TUBAF
  Mainz JGU
  Munich TUM
India Kolkata MIERE
Israel Tel Aviv TAU
Italy Trieste INFN
  Turin INFN
Japan Yamagata Yamagata Univ.
Poland Otwock (Swierk) NCBJ
  Warsaw WUT
Portugal Aveiro UA
  Lisbon LIP
Russia Moscow LPI RAS
  Protvino IHEP
  Tomsk TPU
Taiwan Taipei AS
USA Urbana, IL I