A few words on a proposed LoI: charmed baryon production with CLAS12

Phil ColeIdaho State UniversityMay 2, 2011

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ISSUES*• Want low-Q2 for “virtual-real” photons• Need MC simulations for– “bread-and-butter” charmed baryon resonances– hidden charm N*s and Λ*s

• The reaction: γp DoYc or D±Yc – Do m=1865 MeV and I(Jp) =½(0-)– D± m=1870 MeV and I(Jp) =½(0-)

• At 11 GeV, √s ≈ 4.64 GeV for γp• Hence 4640 MeV – 1870 MeV = 2770 MeV

*(Bing-Song Zou and Qiang Zhao will be at NSTAR 2011 and the PWA workshop at GWU).

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Basic ideas for “bread and butter” physics

Measure JP for regular charmed resonances

• Either not been well measured (Λc(2286)+)• Or not measured at all (assigned via Quark Model)

– Λc(2595)+, Λc(2625)+, Λc(2880)+ , Λc(2940)+

– Σc(2455), Σc(2520), Σc(2800) – Ξc(2468)+, Ξc(2471)0, – etc (see PDG)

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Hidden CharmBing-Song Zou and Jia-Jun Wu

See also: Prediction of narrow N* and Λ* resonances with hidden charm above 4 GeVarXiv:1007.0573v1 [nucl-th] 4 Jul 2010

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Total cross section vs Plab

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Path Forward

• Monte Carlo simulations– at lowest Q2

– range of Q2

– event generator (signal + background)

• Involve Bing-Song Zou and Jia-Jun Wu ASAP

• Travel grant money from DOE for working on this component of the LoI at IHEP-Beijing.

• Discuss this with Bjorken and Brodsky