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A test of local Lorentz invariance with Compton scattering asymmetry.

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Title: A test of local Lorentz invariance with Compton scattering asymmetry.
Authors: Mohanmurthy, Prajwal1,2, Narayan, Amrendra1, Dutta, Dipangkar1
Source: Modern Physics Letters A. Dec2016, Vol. 31 Issue 38, p-1. 11p.
Subjects: Compton scattering, Speed of light, Refractive index, Polariscope, Lorentz invariance, Photon-electron interactions
Abstract: We report on a measurement of the constancy and anisotropy of the speed of light relative to the electrons in photon-electron scattering. We used the Compton scattering asymmetry measured by the new Compton polarimeter in Hall C at Jefferson Lab (JLab) 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 × 10. 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 (LI) using Compton asymmetry. Within the minimal Standard Model extension (MSME) framework, our result yield limits on the photon and electron coefficients , , and . Although these limits are several orders of magnitude larger than the current best limits, they demonstrate the feasibility of using Compton asymmetry for tests of LI. Future parity-violating electron-scattering experiments at JLab will use higher energy electrons enabling better constraints. [ABSTRACT FROM AUTHOR]
Copyright of Modern Physics Letters A is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A test of local Lorentz invariance with Compton scattering asymmetry.
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  Data: We report on a measurement of the constancy and anisotropy of the speed of light relative to the electrons in photon-electron scattering. We used the Compton scattering asymmetry measured by the new Compton polarimeter in Hall C at Jefferson Lab (JLab) 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 &lt; 1.4 &#215; 10. 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 (LI) using Compton asymmetry. Within the minimal Standard Model extension (MSME) framework, our result yield limits on the photon and electron coefficients , , and . Although these limits are several orders of magnitude larger than the current best limits, they demonstrate the feasibility of using Compton asymmetry for tests of LI. Future parity-violating electron-scattering experiments at JLab will use higher energy electrons enabling better constraints. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Modern Physics Letters A is the property of World Scientific Publishing Company and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1142/S0217732316502205
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      – Code: eng
        Text: English
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        PageCount: 11
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    Subjects:
      – SubjectFull: Compton scattering
        Type: general
      – SubjectFull: Speed of light
        Type: general
      – SubjectFull: Refractive index
        Type: general
      – SubjectFull: Polariscope
        Type: general
      – SubjectFull: Lorentz invariance
        Type: general
      – SubjectFull: Photon-electron interactions
        Type: general
    Titles:
      – TitleFull: A test of local Lorentz invariance with Compton scattering asymmetry.
        Type: main
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            NameFull: Mohanmurthy, Prajwal
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            NameFull: Narayan, Amrendra
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            NameFull: Dutta, Dipangkar
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              Text: Dec2016
              Type: published
              Y: 2016
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              Value: 31
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              Value: 38
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            – TitleFull: Modern Physics Letters A
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