Proposal and theoretical formalism for studying baryon radiative decays from J/\psi \to B^*\bar B + \bar{B^*}B \to \gamma B\bar B

With accumulation of high statistics data at BESIII, one may study many new interesting channels. Among them, J/\psi \to B^*\bar B + \bar{B^*}B \to \gamma B\bar B processes may provide valuable information of the radiative decays of the excited baryons (N^*,\Lambda^*,\Sigma^*,\Xi^*), and may shed light on their internal quark-gluon structure. Our estimation for the branching ratios of the nucleon excitations N^*(1440), N^*(1535) and N^*(1520) from the reaction J/\psi \to N^*\bar p + \bar N^* p \to \gamma p\bar p, indicates that these processes can be studied at BESIII with 10^{10} J/\psi events. Explicit theoretical formulae for the partial wave analysis (PWA) of the J/\psi \to B^*\bar B +\bar B^* B with B^*\to B \gamma and \bar B^*\to \bar B\gamma within covariant L-S Scheme are provided.

[1]  B. Zou,et al.  Possible Sigma(1/2(-)) under the Sigma*(1385) peak in K Sigma* photoproduction , 2010, 1001.0805.

[2]  E. Klempt,et al.  Baryon-baryon and baryon-antibaryon interaction amplitudes in the spin-momentum operator expansion method , 2007, hep-ph/0703216.

[3]  B. Zou,et al.  Reply to Comment on Mass and K-Lambda Coupling of the N*(1535) , 2006 .

[4]  F. Close,et al.  Quarks, diquarks and QCD mixing in the $N^*$ resonance spectrum , 2006, hep-ph/0605336.

[5]  A. Sarantsev,et al.  Partial decay widths of baryons in the spin-momentum operator expansion method , 2006, hep-ph/0605135.

[6]  E. Oset,et al.  Unitary coupled channel analysis of the Lambda(1520) resonance , 2006, hep-ph/0603222.

[7]  C. An,et al.  Strangeness spin, magnetic moment, and strangeness configurations of the proton , 2005, hep-ph/0511223.

[8]  B. Zou,et al.  ss component of the proton and the strangeness magnetic moment. , 2005, Physical review letters.

[9]  P. R. Page.  Hybrid and Conventional Baryons in the Flux-Tube and Quark Models , 2004, nucl-th/0410084.

[10]  E. Klempt,et al.  Partial-wave decomposition of pion and photoproduction amplitudes , 2004 .

[11]  M. Lutz,et al.  On meson resonances and chiral symmetry , 2003, nucl-th/0307039.

[12]  F. Wilczek,et al.  Diquarks and exotic spectroscopy. , 2003, Physical review letters.

[13]  B. Zou,et al.  Covariant L-S Scheme for the effective N*NM couplings , 2002, hep-ph/0210164.

[14]  B. Zou,et al.  Covariant tensor formalism for partial-wave analyses of ψ decay to mesons , 2002, hep-ph/0211457.

[15]  E. Oset,et al.  Low lying S = -1 excited baryons and chiral symmetry , 2001, nucl-th/0109006.

[16]  A. Lleres,et al.  Differential cross section measurement of η photoproduction on the proton from threshold to 1100 MeV , 2000, hep-ex/0011098.

[17]  M. Lutz,et al.  Relativistic chiral SU(3) symmetry, large-Nc sum rules and meson–baryon scattering , 2001, nucl-th/0105042.

[18]  R. W. Major,et al.  The ep -->e'p eta reaction at and above the S11(1535) baryon resonance. , 2000, Physical review letters.

[19]  Masaharu Nomachi,et al.  Experiment at SPring-8 , 2000 .

[20]  S. Klein,et al.  Passage of particles through matter , 2000 .

[21]  R. Tu-nan,et al.  Wavefunctions for Particles of Half-Integer Spins , 1999 .

[22]  M. Tran.  Measurement of ?p?K+? and ?p?K+S0 at photon energies up to 2 GeV , 1998 .

[23]  S. U. Chung,et al.  General formulation of covariant helicity-coupling amplitudes , 1998 .

[24]  N. Kaiser,et al.  SU(3) chiral dynamics with coupled channels eta and kaon photoproduction , 1996, hep-ph/9607459.

[25]  J. Speth,et al.  Mesonic Contributions to the Spin and Flavor Structure of the Nucleon , 1996 .

[26]  L. Landsberg.  Radiative decays of hyperon resonances , 1996 .

[27]  N. Kaiser,et al.  Chiral dynamics and the S11 (1535) nucleon resonance , 1995, nucl-th/9507036.

[28]  Chung.  Helicity-coupling amplitudes in tensor formalism. , 1993, Physical review. D, Particles and fields.

[29]  C. W. Wong,et al.  Cluster Model of Baryons , 1983 .

[30]  G. Karl,et al.  Single pion photoproduction in the quark model , 1969 .

[31]  C. Frønsdal,et al.  Fermi Decay of Higher Spin Particles , 1957 .

[32]  J. Schwinger,et al.  On a theory of particles with half integral spin , 1941 .