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 accelerators, cryogenics and magnetism

Institute of research into the fundamental laws of the Universe