DVCS off 4He at CLAS e- 4He → e- 4He γ

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Presentation transcript:

DVCS off 4He at CLAS e- 4He → e- 4He γ RTPC for 4He detection ◊ Study the nuclear medium modifications in 4He: one GPD (HA(x,ξ,t)). ◊ Set of exclusivity cuts based on 4-momentum conservation ◊ Calculation the beam-spin asymmetry (ALU(𝜙)): 𝜙: the angle between the leptonic and the hadronic plans ◊ Model-independent extraction of Compton form factor from ALU(𝜙): e- 4He → e- 4He γ ◈ 6.06 GeV polarized e- beam ◈ 6 atm 4He gaseous target ◈ 20 PAC days ◈ e- in the CLAS spectrometer ◈ 4He in a Radial TPC around the target cell ◈ 𝛄 in an inner calorimeter (𝜃 [4º, 14º]) 𝛼j(𝜙): kinematical factors CLAS-EG6: M. Hattawy et al. (CLAS Collaboration), PRL 119, 202004 (2017) Convolution-Dual: V. Guzey, PRC 78, 025211 (2008). Convolution-VGG: M. Guidal, M. V. Polyakov, A. V. Radyushkin and M. Vanderhaeghen, PRD 72, 054013 (2005) Off-shell model: J. O. Gonzalez-Hernandez, S. Liuti, G. R. Goldstein and K. Kathuria, PRC 88, 065206 (2013)