Measurement ofj/?-decays into channels containing charged and neutral antinucleons

The photoproduction of neutral pions on 12C has been investigated between threshold and 450MeV photon energy using the tagged photon beam at the Bonn 500MeV synchrotron and a large acceptance detector. The rc ~ detector consists of cylindrical wire chambers covering a solid angle of nearly 4m Using a scintillation counter as an active 12C target an attempt was made to separate coherent and incoherent n ~ photoproduction. The measured total and differential cross sections are compared to corresponding theoretical calculations.

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“…It has been used as the central detector in an experiment at the DESY e + e-storage ring DORIS [14].…”

Section: Detection Apparatusmentioning

confidence: 99%

Experimental investigation of the reaction12C(?, ?0)X in the photon energy range between threshold and 450 MeV

et al. 1983

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“…ADONE at Frascati [60][61][62], DORIS at Hamburg [63][64][65] and DCI at Orsay [66,67]. Some of the detectors that provided measurements of the J/ψ decays are [68][69][70][71][72][73][74]:…”

Section: Methodsmentioning

confidence: 99%

Hadronic decays of the $J/ψ$ meson

Mangoni

2020

Preprint

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“…Imposing a Breit-Wigner f 0 mass profile with Γ f0 = 0.5 GeV, truncated at 2m π , decreases all the absolute theoretical Ψ → ppf 0 (500) branching fractions in Table II ( A light scalar f 0 meson would presumably decay strongly and perhaps dominantly to ππ, so decays of the type Ψ → ppππ are of special interest, notably J/ψ → ppππ (in view of our large theoretical B(J/ψ → ppf 0 (500))). The charged case J/ψ → ppπ + π − has been studied by Mark-I [27], DESY [30] and Mark-II [29]. Although no light scalar mesons have yet been identified in this decay, it is suggestive that J/ψ → ppπ + π − is the largest known exclusive J/ψ → ppX mode, with a branching fraction of B(J/ψ → ppπ + π − ) = (6.0 ± 0.5) · 10 −3 .…”

Section: E Scalar Mesons In ψ → Nn Mmentioning

confidence: 99%

Meson emission model ofΨ→NN¯mcharmonium strong decays

Barnes¹,

Roberts

2010

Phys. Rev. D

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In this paper we consider a sequential ''meson emission'' mechanism for charmonium decays of the type É ! N " Nm, where É is a generic charmonium state, N is a nucleon, and m is a light meson. This decay mechanism, which may not be dominant in general, assumes that an N " N pair is created during charmonium annihilation, and the light meson m is emitted from the outgoing nucleon or antinucleon line. A straightforward generalization of this model can incorporate intermediate N Ã resonances. We derive Dalitz plot event densities for the cases É ¼ c , J=c , c0 , c1 , and c 0 ; and m ¼ 0 , f 0 , and ! (and implicitly, any 0 Àþ , 0 þþ , or 1 ÀÀ final light meson). It may be possible to separate the contribution of this decay mechanism to the full decay amplitude through characteristic event densities. For the decay subset É ! p " p 0 the two model parameters are known, so we are able to predict absolute numerical partial widths for ÀðÉ ! p " p 0 Þ. In the specific case J=c ! p " p 0 the predicted partial width and M p event distribution are intriguingly close to experiment. We also consider the possibility of scalar meson and glueball searches in É ! p " pf 0 . If the meson emission contributions to É ! N " Nm decays can be isolated and quantified, they can be used to estimate meson-nucleon strong couplings fg NNm g, which are typically poorly known, and are a crucial input in meson exchange models of the NN interaction. The determination of g NN from J=c ! p " p 0 and the (poorly known) g NN! and the anomalous ''strong magnetic'' coupling NN! from J=c ! p " p! are considered as examples.

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Measurement ofj/?-decays into channels containing charged and neutral antinucleons

Cited by 10 publications

References 11 publications

Experimental investigation of the reaction12C(?, ?0)X in the photon energy range between threshold and 450 MeV

Experimental investigation of the reaction12C(?, ?0)X in the photon energy range between threshold and 450 MeV

Hadronic decays of the $J/ψ$ meson

Meson emission model ofΨ→NN¯mcharmonium strong decays

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