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Meson spectroscopy with CLAS [ CLAS12

CLAS/g6: g p ’ n p + p + p -. a 2. Meson spectroscopy with CLAS [ CLAS12. Successful PWA of CLAS photoproduction data showed a feasibility of meson spectroscopy studies using the CLAS detector It also reviled importance of backgrounds from D ’s and N*’s.

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Meson spectroscopy with CLAS [ CLAS12

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  1. CLAS/g6: gp’np+p+p- a2 Meson spectroscopy with CLAS [ CLAS12 Successful PWA of CLAS photoproduction data showed a feasibility of meson spectroscopy studies using the CLAS detector It also reviled importance of backgrounds from D’s and N*’s Background from s-channel processes complicates PWA (need a high statistics data), introduces ambiguities Coherent production on nuclei can be used to eliminate s-channel background Experiments with coherent production require: • detection ofA’at t’tmin (Ek>few MeV) - thin targets(~10-3 g/cm2) • small size, high flux (virtual) photon beams CLAS(12) with BoNuS RTPC and with available high precision, high intensity electron beams opens a new avenue for meson spectroscopy using coherent production on nuclei S. Stepanyan Town Meeting, Rutgers Univ., January 12-14 2007

  2. Coherent production of p0h and p0h’ on 4He (PR-07-009) Coherent production on 4He eliminates s-channel contribution Scattering off of the spin and isospin zero target works as a spin and parity filter for final state mesons • Final states p0h and p0h’ have I=1, C=+1, G=-1, and P=(-1)l.Resonance in theP-wave will be an exotic - IGJPC= 1-1-+ • Only C=-1 w-exchanges is allowed, Natural Parity Exchange (NPE) • The helicity of the produced state will be that of the incoming photon, l=lg, production of p0h (p0h’) in S-wave is forbidden S. Stepanyan Town Meeting, Rutgers Univ., January 12-14 2007

  3. CLAS12 with thin targets (3H, 3He, 4He) and with small angle tagger Spectroscopy can be extended to the higher masses (~3 GeV) and to the charged modes Electroproduction at very small Q2’10-3, scattering angles 1o-2o, is equivalent to photoproduction with partially linearly polarized photons, complimentary solution to photon bremsstrahlung beams S. Stepanyan Town Meeting, Rutgers Univ., January 12-14 2007

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