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Title: Three-body Final State Interaction in η→3π

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology
 [1];  [2];  [3];  [2];  [4];  [1]
  1. Indiana Univ., Bloomington, IN (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); George Washington Univ., Washington, DC (United States)
  4. Indiana Univ., Bloomington, IN (United States)

We present an unitary dispersive model for the $$\eta \to 3 \pi$$ decay process based upon the Khuri-Treiman equations which are solved by means of the Pasquier inversion method. The description of the hadronic final-state interactions for the $$\eta \to 3\pi$$ decay is essential to reproduce the available data and to understand the existing discrepancies between Dalitz plot parameters from experiment and chiral perturbation theory. Our approach incorporates substraction constants that are fixed by fitting the recent high-statistics WASA-at-COSY data for $$\eta \to \pi^+ \pi^- \pi^0$$. Based on the parameters obtained we predict the slope parameter for the neutral channel to be $$\alpha=-0.022\pm 0.004$$. Through matching to next-to-leading order chiral perturbation theory we estimate the quark mass double ratio to be $$Q=21.4 \pm 0.4$$.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Organization:
Joint Physics Analysis Center
Grant/Contract Number:
AC05-06OR23177
OSTI ID:
1223489
Report Number(s):
JLAB-THY--15-2041; DOE/OR/23177--3343; arXiv:1505.01715
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Journal Issue: 5 Vol. 92; ISSN PRVDAQ; ISSN 1550-7998
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (15)

Theoretical analysis of the γγ (*)π 0 η process journal January 2019
One spatial dimensional finite volume three-body interaction for a short-range potential journal March 2017
Theoretical analysis of the γ γ → π 0 η process journal December 2017
Numerical approach for finite volume three-body interaction journal January 2018
Amplitude analysis of the anomalous decay η ′ → π + π − γ journal February 2018
Variational approach to N -body interactions in finite volume journal November 2018
Multiple-particle interaction in ( 1 + 1 )-dimensional lattice model journal January 2019
η → 3 π : Study of the Dalitz Plot and Extraction of the Quark Mass Ratio Q journal January 2017
Three-body unitarity with isobars revisited journal September 2017
Dispersion relations for $$\eta '\rightarrow \eta \pi \pi $$ η ′ → η π π journal July 2017
What is the right formalism to search for resonances? journal March 2018
Khuri–Treiman equations for $$\pi \pi $$ π π scattering journal July 2018
Dispersive analysis of $$\eta \rightarrow 3 \pi $$ η → 3 π journal November 2018
Solving integral equations in $$\eta \rightarrow 3\pi $$ η → 3 π journal November 2018
Variational approach to $N$-body interactions in finite volume text January 2018

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