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Title: Final state interaction effects in near threshold enhancement of the pp mass spectrum in B and J/{psi} decays

Abstract

A near threshold enhancement in the pp invariant mass spectrum has been reported by the BELLE, BES, and BABAR collaborations for several B and J/{psi} decays. This enhancement has been interpreted as a narrow baryonium state X(1835). We investigate its nature using a pp interaction derived from a constituent quark model. This interaction does not show any pp bound state but a {sup 3}P{sub 0} resonance. We show that pp final state interaction can reproduce the mass dependence of the pp mass spectrum close to the threshold observed in different B and J/{psi} decays.

Authors:
;  [1]
  1. Grupo de Fisica Nuclear, IUFFyM, Universidad de Salamanca, E-37008 Salamanca (Spain)
Publication Date:
OSTI Identifier:
20933219
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.75.014004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B MESONS; BARYONIUM; BARYONS; BOUND STATE; FINAL-STATE INTERACTIONS; HADRONIC PARTICLE DECAY; J PSI-3097 MESONS; MASS SPECTRA; QUARK MODEL; RESONANCE PARTICLES

Citation Formats

Entem, D. R., and Fernandez, F. Final state interaction effects in near threshold enhancement of the pp mass spectrum in B and J/{psi} decays. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.014004.
Entem, D. R., & Fernandez, F. Final state interaction effects in near threshold enhancement of the pp mass spectrum in B and J/{psi} decays. United States. doi:10.1103/PHYSREVD.75.014004.
Entem, D. R., and Fernandez, F. Mon . "Final state interaction effects in near threshold enhancement of the pp mass spectrum in B and J/{psi} decays". United States. doi:10.1103/PHYSREVD.75.014004.
@article{osti_20933219,
title = {Final state interaction effects in near threshold enhancement of the pp mass spectrum in B and J/{psi} decays},
author = {Entem, D. R. and Fernandez, F.},
abstractNote = {A near threshold enhancement in the pp invariant mass spectrum has been reported by the BELLE, BES, and BABAR collaborations for several B and J/{psi} decays. This enhancement has been interpreted as a narrow baryonium state X(1835). We investigate its nature using a pp interaction derived from a constituent quark model. This interaction does not show any pp bound state but a {sup 3}P{sub 0} resonance. We show that pp final state interaction can reproduce the mass dependence of the pp mass spectrum close to the threshold observed in different B and J/{psi} decays.},
doi = {10.1103/PHYSREVD.75.014004},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • We report the observation of a near-threshold enhancement in the {omega}J/{psi} invariant mass distribution for exclusive B{yields}K{omega}J/{psi} decays. The results are obtained from a 253 fb{sup -1} data sample that contains 275x10{sup 6} BB pairs that were collected near the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric energy e{sup +}e{sup -} collider. The statistical significance of the {omega}J/{psi} mass enhancement is estimated to be greater than 8{sigma}.
  • Evidence is reported for a narrow structure near the J/{psi}{phi} threshold in exclusive B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV. A signal of 14 {+-} 5 events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of 2.7 fb{sup -1}, collected by the CDF II detector. The mass and natural width of the structure are measured to be 4143.0 {+-} 2.9(stat) {+-} 1.2(syst) MeV/c{sup 2} and 11.7{sub -5.0}{sup +8.3}(stat) {+-} 3.7(syst) MeV/c{sup 2}.
  • We investigate the nature of the near-threshold enhancement in the pp invariant-mass spectrum of the reaction J/{psi}{yields}{gamma}pp reported recently by the BES Collaboration. Using the Juelich NN model we show that the mass dependence of the pp spectrum close to the threshold can be reproduced by the S-wave pp final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the NN interaction near-threshold and of the J/{psi}{yields}{gamma}pp reaction mechanism and in view of the controversal situation in the decay J/{psi}{yields}{pi}{sup 0}pp, where no obvious signs of a pp final state interactionmore » are seen, explanations other than final state interactions cannot be ruled out at the present stage.« less
  • Observation is reported for a structure near the J/{psi}{phi} threshold in B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 {+-} 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9}(stat) {+-} 0.6(syst) MeV/c{sup 2} and a width of 15.3{sub -6.1}{sup +10.4}(stat) {+-} 2.5(syst) MeV/c{sup 2}, which are consistent with the previous measurements reported as evidence of the Y(4140).
  • We investigate the nature of the near-threshold enhancement in the p {bar p} invariant mass spectrum of the reaction J/{Psi} {yields} {gamma} p {bar p} reported recently by the BES Collaboration. Using the Juelich N {bar N} model we show that the mass dependence of the p {bar p} spectrum close to the threshold can be reproduced by the S-wave p {bar p} final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the N {bar N} interaction near threshold and of the J/{Psi} {yields} {gamma} p {bar p} reaction mechanismmore » and in view of the controversial situation in the decay J/{Psi} {yields} {pi}{sup 0} p {bar p}, where no obvious signs of a p {bar p} final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.« less