Pion polarizabilities from a analysis
Abstract
Here, we present results for pion polarizabilities predicted using dispersion relations from our earlier Amplitude Analysis of world data on two photon production of meson pairs. The helicity-zero polarizabilities are rather stable and insensitive to uncertainties in cross-channel exchanges. The need is first to confirm the recent result on $$(\alpha_1-\beta_1)$$ for the charged pion by COMPASS at CERN to an accuracy of 10% by measuring the $$\gamma\gamma\to\pi^+\pi^-$$ cross-section to an uncertainty of ~1\%. Then the same polarizability, but for the $$\pi^0$$, is fixed to be $$(\alpha_1-\beta_1)_{\pi^0}=(0.9\pm0.2)\times 10^{-4}$$ fm$$^{3}$$. By analyzing the correlation between uncertainties in the meson polarizability and those in $$\gamma\gamma$$ cross-sections, we suggest experiments need to measure these cross-sections between $$\sqrt{s}\simeq 350$$ and 600~MeV. The $$\pi^0\pi^0$$ cross-section then makes the $$(\alpha_2-\beta_2)_{\pi^0}$$ the easiest helicity-two polarizability to determine.
- Authors:
-
- Institut fur Kernphysik and Julich Center for Hadron Physics, Forschungszentrum Julich, Julich (Germany); Indiana Univ., Bloomington, IN (United States)
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); College of William and Mary, Williamsburg, VA (United States)
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1338179
- Alternate Identifier(s):
- OSTI ID: 1338122
- Report Number(s):
- JLAB-THY-16-2386; DOE/OR/23177-4002; arXiv:1611.14441
Journal ID: ISSN 2470-0010; PRVDAQ; TRN: US1701067
- Grant/Contract Number:
- SFB/TR 110; AC05-06OR23177
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 11; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; pion polarizability; dispersion relations; partial-wave analysis; Chiral Lagrangian; meson production
Citation Formats
Dai, Ling -Yun, and Pennington, Michael R. Pion polarizabilities from a γγ→ππ analysis. United States: N. p., 2016.
Web. doi:10.1103/PhysRevD.94.116021.
Dai, Ling -Yun, & Pennington, Michael R. Pion polarizabilities from a γγ→ππ analysis. United States. https://doi.org/10.1103/PhysRevD.94.116021
Dai, Ling -Yun, and Pennington, Michael R. Fri .
"Pion polarizabilities from a γγ→ππ analysis". United States. https://doi.org/10.1103/PhysRevD.94.116021. https://www.osti.gov/servlets/purl/1338179.
@article{osti_1338179,
title = {Pion polarizabilities from a γγ→ππ analysis},
author = {Dai, Ling -Yun and Pennington, Michael R.},
abstractNote = {Here, we present results for pion polarizabilities predicted using dispersion relations from our earlier Amplitude Analysis of world data on two photon production of meson pairs. The helicity-zero polarizabilities are rather stable and insensitive to uncertainties in cross-channel exchanges. The need is first to confirm the recent result on $(\alpha_1-\beta_1)$ for the charged pion by COMPASS at CERN to an accuracy of 10% by measuring the $\gamma\gamma\to\pi^+\pi^-$ cross-section to an uncertainty of ~1\%. Then the same polarizability, but for the $\pi^0$, is fixed to be $(\alpha_1-\beta_1)_{\pi^0}=(0.9\pm0.2)\times 10^{-4}$ fm$^{3}$. By analyzing the correlation between uncertainties in the meson polarizability and those in $\gamma\gamma$ cross-sections, we suggest experiments need to measure these cross-sections between $\sqrt{s}\simeq 350$ and 600~MeV. The $\pi^0\pi^0$ cross-section then makes the $(\alpha_2-\beta_2)_{\pi^0}$ the easiest helicity-two polarizability to determine.},
doi = {10.1103/PhysRevD.94.116021},
journal = {Physical Review D},
number = 11,
volume = 94,
place = {United States},
year = {Fri Dec 30 00:00:00 EST 2016},
month = {Fri Dec 30 00:00:00 EST 2016}
}
Web of Science
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Works referencing / citing this record:
Nature of the : A light-quark perspective
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