Observation of the Helicity-Selection-Rule Suppressed Decay of the χ(c2) Charmonium State

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Observation of the Helicity-Selection-Rule Suppressed Decay of the χ(c2) Charmonium State

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Title: Observation of the Helicity-Selection-Rule Suppressed Decay of the χ(c2) Charmonium State
Author(s):
Ablikim, M.;
Achasov, M. N.;
Ahmed, S.;
Ai, X. C.;
Albayrak, O.;
Albrecht, M.;
Ambrose, D. J.;
Lou, Xinchou;
BESIII Collaboration
Date Created: 2017-12-07
Item Type: article
Keywords: Mesons
Isobaric spin
Branching fractions (Nuclear physics)
Charmonium
Description: Includes supplementary material
Abstract: The decays of χ(c2) → K⁺K⁻ π⁰, K(S)K(±)π(∓), and π⁺π⁻π⁰ are studied with the ψ(3686) data samples collected with the Beijing Spectrometer ( BESIII). For the first time, the branching fractions of χ(c2) → K*K̅, χ(c2) → a₂(±)(1320)π(∓)/a₂⁰(1320)π⁰, and χ(c2) → ρ(770)(±)π(∓) are measured. Here, K*K̅ denotes both K*(±)K(∓) and its isospin-conjugated process K*⁰K̅⁰ + c.c., and K* denotes the resonances K*(892), K₂*(1430), and K₃*(1780). The observations indicate a strong violation of the helicity selection rule in χ(c2) decays into vector and pseudoscalar meson pairs. The measured branching fractions of χ(c2) → K*(892)K̅ are more than ten times larger than the upper limit of χ(c2) → ρ(770)(±)π(∓), which is so far the first direct observation of a significant U-spin symmetry breaking effect in charmonium decays.
Publisher: Amer Physical Soc
ISSN: 2470-0010
Source: Physical Review D
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.96.111102
Persistent Link: http://hdl.handle.net/10735.1/6174
Bibliographic Citation: Ablikim, M., M. N. Achasov, S. Ahmed, X. C. Ai, et al. 2017. "Observation of the helicity-selection-rule suppressed decay of the χ(c2) charmonium state." Physical Review D 96(11), doi:10.1103/PhysRevD.96.111102
Terms of Use: ©2017 American Physical Society. All Rights Reserved.

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