Search results for "(p anti-p) [mass spectrum]"

showing 2 items of 2 documents

Partial wave analysis of ψ(2S)→ppˉη

2013

Using a sample of 1.06 x 10(8) psi(2) events collected with the BESIII detector at BEPCII, the decay psi(2S) -> p (p) over bar eta is studied. A partial wave analysis determines that the intermediate state N(1535) with a mass of 1524 +/- 5(-4)(+10) MeV/c(2) and a width of 130(-24-10)(+27+57) MeV/c(2) is dominant in the decay; the product branching fraction is determined to be B(psi(2S) -> N(1535)(p) over bar x B(N(1535) -> p eta + c.c. = 5.2 +/- 0.3(-1.2)(+3.2)) x 10(-5). Furthermore, the branching fraction of psi(2S) -> p (p) over bar eta is measured to be (6.4 +/- 0.2 +/- 0.6) x 10(-5). Here, the first error is statistical and the second is systematic.

Nuclear and High Energy PhysicsElectron–positron annihilationPartial wave analysiseta --> 2photonAnalytical chemistryannihilation [electron positron]mass spectrumAngular distributionIntermediate stateddc:530angular distributionpsi(3685) --> N(1535) anti-pPhysicsassociated production [eta]BESBranching fractionpsi(3685) --> p anti-p etabranching ratio: measured [psi(3685)]intermediate state [N(1535)]partial wave analysisBeijing StorN(1535) --> p eta3.68 GeV-cmsMass spectrumHigh Energy Physics::ExperimentAtomic physicshadronic decay [psi(3685)]pair production [p]Bar (unit)experimental results
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Role of the N-*(1535) in the J/psi -> pp and J/psi -> p(+)Lambda reactions

2009

We study the J/psi -> p eta p and J/psi -> pK(+)Lambda reactions with a unitary chiral approach. We find that the unitary chiral approach, which generates the N-*(1535) dynamically, can describe the data reasonably well, particularly the ratio of the integrated cross sections. This study provides further support for the unitary chiral description of the N-*(1535). We also discuss some subtle differences between the coupling constants determined from the unitary chiral approach and those determined from phenomenological studies

ratio [width]High Energy Physics::LatticeJ/psi(3100) --> p anti-p etaJ/psi(3100) --> Lambda anti-p K+Físicahadronic decay [J/psi(3100)]coupling constant [N(1535)]mass spectrumwidth [J/psi(3100)]unitarityddc:530chiral [effective Lagrangian]numerical calculations
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