Partial wave analysis ofJ/ψ→pp¯π0

Abstract

Using a sample of 58 million J/ψ events collected with the BESII detector at the BEPC, more 2 than 100,000 J/ψ → ppπ 0 events are selected, and a detailed partial wave analysis is performed. The branching fraction is determined to be Br(J/ψ → ppπ 0 ) = (1.33 ± 0.02 ± 0.11) × 10 −3 . A long-sought 'missing' N * , first observed in J/ψ → pnπ − , is observed in this decay too, with mass and width of 2040 +3 −4 ± 25 MeV/c 2 and 230 +8 −8 ± 52 MeV/c 2 , respectively. Its spin-parity favors 3 2 + . The masses, widths, and spin-parities of other N * states are obtained as well.

Angular distributions inJ/ψ→pp¯π0(Дмитриев1, Milstein2, Salnikov3 2016Physics Letters B100120View full textAdd to dashboardCite

“…There are some data on the angular distributions in the decays J/ψ → ppπ 0 [27] and J/ψ → ppη [28]. However, these distributions are obtained by integration over the whole The red/dark band corresponds to the model [24] and the green/light band corresponds to the refitted model.…”

Proposal and theoretical formalism for studying baryon radiative decays fromJ/ψ→B*B¯+B¯*B→Dulat1, Wu2, Zou3 2011Phys. Rev. DSelf Cite6060View full textAdd to dashboardCite

“…Previous BES experiments already clearly observed these resonances in J=c ! p " p, " pn þ þ c:c:, " pp 0 [18,19]. With 2 orders of magnitude and higher statistics at BESIII, the radiative decays of these N Ã may also be studied in J=c !…”

“…Based on the branching ratios for the reaction J=c ! N Ã " p þ " N Ã p measured by BESII [19] and branching ratios of N Ã ! p given by PDG [23], we give the estimation of branching ratios for the reaction J=c…”

“…Concerning the internal quark-gluon structure of baryons there are various proposed configurations: (a) the classical constituent three quark ðqqqÞ states; (b) qqqg hybrid states [2]; (c) diquark-quark states [3,4]; (d) meson-baryon states [5][6][7][8]; (e) pentaquark with diquark clusters [9][10][11][12][13], etc. A series of new experiments on excited nucleon N Ã physics with electromagnetic probes have been started at modern facilities such as TJNAF [14], ELSA [15], GRAAL [16], SPRING8 [17] and BEPC [18,19]. In last few years these facilities provided a considerable amount of precise data for various excited nucleon production and decay channels and opened a great opportunity to make quantitative investigations of the baryon structure.…”

$N^*$ Production from $e^+e^-$ Annihilations

“…Since 2001, BES/BESII/BESIII Collaborations have published their results on N * production from J/ψ → ppη [18], pnπ − + c.c. [19], ppπ 0 [20], pK − Λ + c.c. [21], nK 0 S Λ [22], ppω [23], ppφ [24], ppπ 0 η [25], and…”