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Title: Measurement of the matrix elements for the decays η η π + π and η η π 0 π 0

Journal Article · · Physical Review D
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Based on a sample of 1.31 × 109 J/ψ events collected with the BESIII detector, the matrix elements for the decays η' → ηπ+π- and η' → ηπ0π0 are determined using 351,016 η' → (η → γγ)π+π- and 56,249 η' → (η → γγ)π0π0 events with background levels less than 1%. Two commonly used representations are used to describe the Dalitz plot density. We find that an assumption of a linear amplitude does not describe the data well. A small deviation of the obtained matrix elements between η' → ηπ+π- and η' → ηπ0π0 is probably caused by the mass difference between charged and neutral pions or radiative corrections. No cusp structure in η' → ηπ0π0 is observed.

Research Organization:
George Washington Univ., Washington, DC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
BESIII Collaboration
Grant/Contract Number:
FG02-05ER41374; SC-0010118; SC-0010504; SC-0012069; SC0016583
OSTI ID:
1416420
Alternate ID(s):
OSTI ID: 1440854
Journal Information:
Physical Review D, Journal Name: Physical Review D Vol. 97 Journal Issue: 1; ISSN 2470-0010
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Design and construction of the BESIII detector
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journal March 2010

Cited By (15)

Measurement of the matrix elements for the decays $η^′ → η π^+ π^−$ and $η^′ → η π^0 π^0$ text January 2018
Matrix element of the η′(958) → ηπ0π0 decay journal September 1986
Design and construction of the BESIII detector
  • Ablikim, M.; An, Z. H.; Bai, J. Z.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 614, Issue 3 https://doi.org/10.1016/j.nima.2009.12.050
journal March 2010
Observation of a cusp-like structure in the <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> invariant mass distribution from <mml:math altimg="si2.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd"><mml:msup><mml:mi>K</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> decay and determination of the ππ scattering lengths journal February 2006
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Study of Dalitz plot journal July 2007
Pion-pion scattering and the K →3π decay amplitudes journal March 2005
Event generators at BESIII journal August 2008
Review of Particle Physics journal October 2016
Hadronic η and $ \eta{^\prime}$ decays journal December 2005
K→3π final state interactions at NLO in CHPT and Cabibbo’s proposal to measure a0-a2 journal January 2007
The cusp effect in η′→η π π decays journal June 2009
Dispersion relations for $$\eta '\rightarrow \eta \pi \pi $$ η ′ → η π π journal July 2017
Search for the decay η γ γ η journal September 2019
Precision Measurement of the Branching Fractions of η Decays journal April 2019

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