We reanalyze the published data on the Y(4630) -> Lambda(c)(Lambda) over bar (c) and the Y(4660) -> psi(2S)pi pi with a consistent ansatz and we find that the two observations are likely to be due to the same state Y(B), produced via initial state radiation (ISR), with M(YB) = 4660.7 +/- 8.7 MeV and Gamma(YB) = 61 +/- 23 MeV. Under this hypothesis and reanalyzing the e(+)e(-) -> J/psi pi pi gamma(ISR) spectrum we find B(Y(B) -> Lambda(c)(Lambda) over bar (c))/B(Y(B) -> psi(2S)pi pi) = 17 +/- 44, B(Y(B) -> J/psi pi pi)/B(Y(B) -> psi(2S)pi pi) < 0.46@90% C.L., B(Y(4350) -> J/psi pi pi)/B(Y(4350) -> psi(2S)pi pi) < 3.4 x 10(-3)@90% C.L., and B(Y(B) -> psi(2S)sigma)/B(Y(B) -> psi(2S)f(0)) = 2.0 +/- 0.3. These conclusions strongly support the hypothesis of Y(B) being the first observation of a charmed baryonium constituted by four quarks. Analyzing the mass spectrum we show that Y(4350) and Y(B) are, respectively, consistent with the ground state and first radial excitation of the l = 1 state.

Charmed Baryonium / G., Cotugno; Faccini, Riccardo; Polosa, ANTONIO DAVIDE; Sabelli, Chiara. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 104:13(2010), p. 132005. [10.1103/physrevlett.104.132005]

Charmed Baryonium

FACCINI, Riccardo;POLOSA, ANTONIO DAVIDE;SABELLI, CHIARA
2010

Abstract

We reanalyze the published data on the Y(4630) -> Lambda(c)(Lambda) over bar (c) and the Y(4660) -> psi(2S)pi pi with a consistent ansatz and we find that the two observations are likely to be due to the same state Y(B), produced via initial state radiation (ISR), with M(YB) = 4660.7 +/- 8.7 MeV and Gamma(YB) = 61 +/- 23 MeV. Under this hypothesis and reanalyzing the e(+)e(-) -> J/psi pi pi gamma(ISR) spectrum we find B(Y(B) -> Lambda(c)(Lambda) over bar (c))/B(Y(B) -> psi(2S)pi pi) = 17 +/- 44, B(Y(B) -> J/psi pi pi)/B(Y(B) -> psi(2S)pi pi) < 0.46@90% C.L., B(Y(4350) -> J/psi pi pi)/B(Y(4350) -> psi(2S)pi pi) < 3.4 x 10(-3)@90% C.L., and B(Y(B) -> psi(2S)sigma)/B(Y(B) -> psi(2S)f(0)) = 2.0 +/- 0.3. These conclusions strongly support the hypothesis of Y(B) being the first observation of a charmed baryonium constituted by four quarks. Analyzing the mass spectrum we show that Y(4350) and Y(B) are, respectively, consistent with the ground state and first radial excitation of the l = 1 state.
2010
01 Pubblicazione su rivista::01a Articolo in rivista
Charmed Baryonium / G., Cotugno; Faccini, Riccardo; Polosa, ANTONIO DAVIDE; Sabelli, Chiara. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 104:13(2010), p. 132005. [10.1103/physrevlett.104.132005]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/230468
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