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Title: A test of local Lorentz invariance with Compton scattering asymmetry

Journal Article · · Modern Physics Letters A
 [1];  [2]; ORCiD logo [2]
  1. Mississippi State Univ., Mississippi State, MS (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Mississippi State Univ., Mississippi State, MS (United States)

Here, we report on a measurement of the constancy and anisotropy of the speed of light relative to the electrons in photon-electron scattering. We also used the Compton scattering asymmetry measured by the new Compton polarimeter in Hall~C at Jefferson Lab to test for deviations from unity of the vacuum refractive index ($$n$$). For photon energies in the range of 9 - 46 MeV, we obtain a new limit of $$1-n < 1.4 \times 10^{-8}$$. In addition, the absence of sidereal variation over the six month period of the measurement constrains any anisotropies in the speed of light. These constitute the first study of Lorentz invariance using Compton asymmetry. Within the minimal standard model extension framework, our result yield limits on the photon and electron coefficients $$\tilde{\kappa}_{0^+}^{YZ}, c_{TX}, \tilde{\kappa}_{0^+}^{ZX}$$, and $$c_{TY}$$. Though, these limits are several orders of magnitude larger than the current best limits, they demonstrate the feasibility of using Compton asymmetry for tests of Lorentz invariance. For future parity violating electron scattering experiments at Jefferson Lab we will use higher energy electrons enabling better constraints.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Mississippi State Univ., Mississippi State, MS (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC05-06OR23177; FG02-07ER41528
OSTI ID:
1338680
Alternate ID(s):
OSTI ID: 1599638
Report Number(s):
JLAB-PHY-16-2362; DOE/OR/23177-4042; arXiv:1611.09173; TRN: US1701151
Journal Information:
Modern Physics Letters A, Vol. 31, Issue 38; ISSN 0217-7323
Publisher:
World Scientific PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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