skip to main content

DOE PAGESDOE PAGES

This content will become publicly available on December 8, 2016

Title: Resonant π+γπ+π0 amplitude from Quantum Chromodynamics

We present the first ab initio calculation of a radiative transition of a hadronic resonance within Quantum Chromodynamics (QCD). We compute the amplitude for $$\pi\pi \to \pi\gamma^\star$$, as a function of the energy of the $$\pi\pi$$ pair and the virtuality of the photon, in the kinematic regime where $$\pi\pi$$ couples strongly to the unstable $$\rho$$ resonance. This exploratory calculation is performed using a lattice discretization of QCD with quark masses corresponding to $$m_\pi \approx 400$$ MeV. As a result, we obtain a description of the energy dependence of the transition amplitude, constrained at 48 kinematic points, that we can analytically continue to the $$\rho$$ pole and identify from its residue the $$\rho \to \pi\gamma^\star$$ form-factor.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [3]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
  3. Old Dominion Univ., Norfolk, VA (United States)
  4. Univ. of Cambridge, Cambridge (United Kingdom)
Publication Date:
OSTI Identifier:
1227935
Report Number(s):
JLAB-THY--15-2106; DOE/OR/23177--3473; arXiv:1507.06622
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1600796
Grant/Contract Number:
AC05-06OR23177; ST/L000385/1
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 24; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
for the Hadron Spectrum Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS