Pascalutsa-Vanderhaeghen light-by-light sum rule from photon-photon collisions
Journal Article
·
· Physical Review D
- 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)
Light-by-light scattering sumrules based on general field theory principles relate cross-sections with different helicities. In this paper the simplest sumrule is tested for the $I=0$ and $$2$$ channels for \lq\lq real'' photon-photon collisions. Important contributions come from the long-lived pseudoscalar mesons and from di-meson intermediate states. The latest Amplitude Analysis of $$\gamma\gamma\to\pi\pi, \overline{K}K$ allows this contribution to be evaluated. Furthermore, we find that other multi-meson contributions up to 2.5~GeV are required to satisfy the sumrules. While data on three and four pion cross-sections exist, there is no information about their isospin and helicity decomposition. Nevertheless, we show the measured cross-sections are sufficiently large to ensure the sumrules for the helicity differences are likely fulfilled.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1345801
- Alternate ID(s):
- OSTI ID: 1345858
- Report Number(s):
- DOE/OR/23177--4049; JLAB-THY--17-2396; arXiv:1701.04460
- Journal Information:
- Physical Review D, Journal Name: Physical Review D Journal Issue: 5 Vol. 95; ISSN PRVDAQ; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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