Compass : COMmon Muon Proton Apparatus For Structure and Spectroscopy

Compass : COMmon Muon Proton Apparatus For Structure and Spectroscopy

• Structure of nuclear matter › Quarks and gluons hadron structure

• Accelerators, Cryogenics and Magnetism Division (DACM) • The Electronics, Detectors and Computing Division • The Nuclear Physics Division • The Systems Engineering Division

• Nucleon Structure Laboratory (LSN) - The internal structure of hadrons

• Compass : COMmon Muon Proton Apparatus For Structure and Spectroscopy

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Deeply Virtual Compton Scattering (DVCS)

Deeply Virtual Compton Scattering (DVCS) is the simplest hard exclusive process related to Generalized Parton Distributions (GPDs): the scattering of an electron off a proton through the exchange of a photon of virtuality Q2, accompanied by the re-emission of a real photon. At large Q2 and low transfer t the GPD formalism may be applied.

The polarized DRELL-YAN process

Transverse Momentum-dependent Distributions (TMD)

Drell-Yan Process and transverse parton distributions in the nucleon Using a high energy pion beam and a transversally polarized nucleon target, COMPASS is the first experiment measuring directly spin dependent Drell-Yan events. The Drell-Yan process (annihilation of a quark and an anti-quark in a lepton pair q qbarà l+ l-) has been used in the past to study simple distributions of quarks in the nucleon.

Division of systems engineering

Institute of research into the fundamental laws of the Universe