Meson electro/photoproduction from QCD
Abstract
I present the calculation of the $$\pi^+\gamma^\star\to\pi^+\pi^0$$ transition amplitude from quantum chromodynamics performed by the Hadron Spectrum Collaboration. The amplitude is determined for a range of values of the photon virtuality and the final state energy. One observes a clear dynamical enhancement due to the presence of the $$\rho$$ resonance. By fitting the transition amplitude and analytically continuing it onto the $$\rho$$pole, the $$\rho\to\pi\gamma^\star$$ form factor is obtained. This exploratory calculation, performed using lattice quantum chromodynamics, constitutes the very first determination of an electroweak decay of a hadronic resonance directly from the fundamental theory of quarks and gluons. In this talk, I highlight some of the necessary steps that made this calculation possible, placing emphasis on recently developed formalism. In conclusion, I discuss the status and outlook of the field for the study of $$N\gamma^\star\to N^\star\to N\pi$$ transitions.
 Authors:

 Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
 Publication Date:
 Research Org.:
 Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Nuclear Physics (NP) (SC26)
 OSTI Identifier:
 1330673
 Report Number(s):
 JLABTHY152153; DOE/OR/231773851; arXiv:1604.03782
Journal ID: ISSN 01777963; PII: 1124
 Grant/Contract Number:
 AC0506OR23177
 Resource Type:
 Accepted Manuscript
 Journal Name:
 FewBody Systems
 Additional Journal Information:
 Journal Volume: 57; Journal Issue: 10; Conference: "Nucleon Resonances: from Photoproduction to High Photon Virtualities", ECT, Trento (Italy), 1216 Oct 2015; Journal ID: ISSN 01777963
 Publisher:
 Springer
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Briceno, Raul A. Meson electro/photoproduction from QCD. United States: N. p., 2016.
Web. doi:10.1007/s006010161124y.
Briceno, Raul A. Meson electro/photoproduction from QCD. United States. doi:10.1007/s006010161124y.
Briceno, Raul A. Sat .
"Meson electro/photoproduction from QCD". United States. doi:10.1007/s006010161124y. https://www.osti.gov/servlets/purl/1330673.
@article{osti_1330673,
title = {Meson electro/photoproduction from QCD},
author = {Briceno, Raul A.},
abstractNote = {I present the calculation of the $\pi^+\gamma^\star\to\pi^+\pi^0$ transition amplitude from quantum chromodynamics performed by the Hadron Spectrum Collaboration. The amplitude is determined for a range of values of the photon virtuality and the final state energy. One observes a clear dynamical enhancement due to the presence of the $\rho$ resonance. By fitting the transition amplitude and analytically continuing it onto the $\rho$pole, the $\rho\to\pi\gamma^\star$ form factor is obtained. This exploratory calculation, performed using lattice quantum chromodynamics, constitutes the very first determination of an electroweak decay of a hadronic resonance directly from the fundamental theory of quarks and gluons. In this talk, I highlight some of the necessary steps that made this calculation possible, placing emphasis on recently developed formalism. In conclusion, I discuss the status and outlook of the field for the study of $N\gamma^\star\to N^\star\to N\pi$ transitions.},
doi = {10.1007/s006010161124y},
journal = {FewBody Systems},
number = 10,
volume = 57,
place = {United States},
year = {2016},
month = {7}
}
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