We present an analysis of the process e(+)e(-) -> pi(+)pi(-)Gamma(nS) (where n = 1, 2, or 3) reconstructed in 19.6 fb(-1) of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the Gamma(10753) resonance. By analyzing the mass distribution of the pi(+)pi(-)Gamma(nS) system and the Born cross sections of the e(+)e(-) -> pi(+)pi(-)Gamma(nS) process, we report the first observation of Gamma(10753) decays to the pi(+)pi(-)Gamma(1S) and pi(+)pi(-)Gamma(2S) final states, and find no evidence for decays to pi(+)pi(-)Gamma(3S). Possible intermediate states in the pi(+)pi(-)Gamma(1S, 2S) transitions are also investigated, and no evidence for decays proceeding via the pi -/+ Zb +/- or f(0)(980)Gamma(nS) intermediate states is found. We measure Born cross sections for the e(+)e(-) -> pi(+)pi(-)Gamma(nS) process that, combined with results from Belle, obtain the mass and width of Gamma(10753) to be (10756.6 +/- 2.7 +/- 0.9) MeV/c(2) and (29.0 +/- 8.8 +/- 1.2) MeV, respectively. The relative ratios of the Born cross sections at the Gamma(10753) resonance peak are also reported for the first time.

Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., et al. (2024). Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 2024(7), 1-18 [10.1007/jhep07(2024)116].

Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II

Branchini, P.
Membro del Collaboration Group
;
Budano, A.
Membro del Collaboration Group
;
Bussino, S.
Membro del Collaboration Group
;
De Pietro, G.
Membro del Collaboration Group
;
Laurenza, M.
Membro del Collaboration Group
;
Martellini, C.
Membro del Collaboration Group
;
Martini, A.
Membro del Collaboration Group
;
2024-01-01

Abstract

We present an analysis of the process e(+)e(-) -> pi(+)pi(-)Gamma(nS) (where n = 1, 2, or 3) reconstructed in 19.6 fb(-1) of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the Gamma(10753) resonance. By analyzing the mass distribution of the pi(+)pi(-)Gamma(nS) system and the Born cross sections of the e(+)e(-) -> pi(+)pi(-)Gamma(nS) process, we report the first observation of Gamma(10753) decays to the pi(+)pi(-)Gamma(1S) and pi(+)pi(-)Gamma(2S) final states, and find no evidence for decays to pi(+)pi(-)Gamma(3S). Possible intermediate states in the pi(+)pi(-)Gamma(1S, 2S) transitions are also investigated, and no evidence for decays proceeding via the pi -/+ Zb +/- or f(0)(980)Gamma(nS) intermediate states is found. We measure Born cross sections for the e(+)e(-) -> pi(+)pi(-)Gamma(nS) process that, combined with results from Belle, obtain the mass and width of Gamma(10753) to be (10756.6 +/- 2.7 +/- 0.9) MeV/c(2) and (29.0 +/- 8.8 +/- 1.2) MeV, respectively. The relative ratios of the Born cross sections at the Gamma(10753) resonance peak are also reported for the first time.
2024
Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., et al. (2024). Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II. JOURNAL OF HIGH ENERGY PHYSICS, 2024(7), 1-18 [10.1007/jhep07(2024)116].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/489933
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact