Collaboration

A1 Mainz-KPH, CEA-Saclay, LPC Clermont,
Gent University, ECT-Trento,
Ljubljana Inst. Slovenia, Zagreb Univ., ...

A1 Web page :

Access the website

VCS-PREMIÈRE EXPÉRIENCE À MAMI

See Article

VCS-SSA : SINGLE SPIN ASYMMETRY IN

$$\overrightarrow{e}p \rightarrow ep\gamma$$

• Experiment performed at MAMI in 2002-2004
  • Some transparencies (from H. Merkel)
  • Theoretical SSA : calculation based on the Dispersion Relation Model of B. Pasquini et al., Eur.Phys.J.A 11 (2001) 185, and hep-ph/0102335.

• Results : see this poster

• Thesis at LPC : I. BENSAFA
  Article : see hep-ph/0112248

VCS-DSA : DOUBLE SPIN ASYMMETRY IN

$$ \overrightarrow{e}p \rightarrow ep\gamma $$

• Experiment performed at MAMI starting from 2004 to 2006

For theoretical formalism of VCS-DSA, see :

• M. Vanderhaeghen,Phys.Lett.B 402 (1997) 243.

• PhD Thesis of Luca DORIA, Mainz. Univ. (2008)
• PhD Thesis of P.JANSSENS, Univ.Gent, Belgium (2007)
• see Article 1 (unpolarized)
• see Article 2 (doubly polarized)

NEXT VCS EXPERIMENT :

$$ep \rightarrow ep\gamma \ at \ Q^{2} = 0.1,0.2,0.5GeV^{2}$$

• Goal  : map out the electric and magnetic polarizabilities, α and β, as a function of Q².
• Proposal (2009) : see here
• results at Q2=0.10 GeV2 (preliminary) : PhD Thesis of Jure BERICIC, Ljubljana University (2015), see here
• results at Q2=0.45 GeV2 (preliminary) : PhD Thesis of Meriem BENALI, UBP Clermont (2016), see here
• results at Q2=0.20 GeV2 : PhD Thesis of Loup CORREA, UBP-Clermont/JGU-Mainz (2016), see here
• Overview talk at LEPP workshop, Mainz, H.Fonvieille (2016) : see here
• Final publication : J.Bericic, L. Correa, M. Benali, et al., "New insight in the Q2-dependence of proton generalized polarizabilities", to appear in Phys.Rev.Lett. (2019).