Prospects for testing Lorentz and CPT symmetry with antiprotons

Vargas, Arnaldo J.

doi:10.1098/rsta.2017.0276

Cited by 4 publications

(6 citation statements)

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“…It shows an important feature, viz. that unlike the |d → |d 27 To compare with [103,115] (see also [122]), these references rewrite the SME tensor couplings in a spherical basis then, after making appropriate field redefinitions, consider the isotropic components which are sufficient to describe the = 0 states. In their notation, with couplings a NR njm , the dictionary to compare with (3.22) and (3.23) is then a NR 000 = a 0 + a (5) and a NR 200 = 1 3 tr a transition, the |c → |c transition has a contribution at O(1) in the fine structure constant, albeit highly suppressed by a magnetic field factor.…”

Section: S -2s Antihydrogen Transitionsmentioning

confidence: 99%

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Antihydrogen and Fundamental Physics

Charlton¹,

Eriksson²,

Shore³

2020

SpringerBriefs in Physics

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The recent advent of high precision antihydrogen (H) spectroscopy opens the way to stringent experimental tests of the fundamental principles underlying particle physics and general relativity (GR), such as Lorentz and CPT invariance and the Einstein Equivalence Principle (EEP), on pure antimatter systems. In this paper, the nature and implications of these tests is investigated, with special reference to the ALPHA antihydrogen programme at CERN. This is underpinned by a theoretical review of the role of antiparticles, causality and fundamental symmetries in relativistic quantum field theory (QFT) and the theory of time measurement in GR. Low-energy effective theories which break Lorentz and CPT symmetry, or the Strong Equivalence Principle (SEP), are then introduced, together with a review of several 'fifth force' scenarios involving new long-range forces which would effectively violate the universality of free-fall, or Weak Equivalence Principle (WEPff). The possible role of CPT violation in determining the matter-antimatter asymmetry of the Universe is discussed. Explicit calculations are given for the dependence on possible Lorentz and CPT violating couplings of the transition frequencies amongst the 1S, 2S and 2P hyperfine states measured in the magnetic field of the ALPHA trap and the resulting bounds are compared with existing limits. An analysis of the implications for the EEP of current free-fall and spectroscopic measurements with antihydrogen is presented and existing and potential bounds on WEPff and the universality of clocks (WEPc) are derived, together with constraints on fifth forces. Future prospects for high-precision antihydrogen spectroscopy, free-fall and gravitational redshift experiments, and antiatom matter-wave interferometry are described and experimental possibilities involving other antimatter species are briefly outlined.

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Section: S -2s Antihydrogen Transitionsmentioning

confidence: 99%

“…Note that the formula quoted in[115,122] for the SME contribution to the 1S -2S transition omits the spin-dependent couplings such as b 3 in(3.26). This is because they assume prior to calculating the energy levels that these couplings are negligible compared to a NR 200 and c 00 , on the basis of the existing experimental constraints given in[44].…”

mentioning

confidence: 99%

Antihydrogen and Fundamental Physics

Charlton¹,

Eriksson²,

Shore³

2020

SpringerBriefs in Physics

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show abstract

“…Finally, we can read off the SME contributions to the 1S d -2S d and 1S c -2S c tran- 27 To compare with [97,109] (see also [116]), these references rewrite the SME tensor couplings in a spherical basis then, after making appropriate field redefinitions, restrict to the isotropic components which are sufficient to describe the = 0 states. In their notation, the dictionary to compare with (3.22) and (3.23) is then a NR 000 = a 0 + a (5) and a NR 200 = 1 3 tr a sitions in antihydrogen, as measured by ALPHA [1] (see Figure 4) : Although cos 2θ n 1 at the high magnetic field in the ALPHA trap, we have kept this dependence here.…”

Section: S -2s Antihydrogen Transitionsmentioning

confidence: 99%

“…Note that the formula quoted in[109,116] for the SME contribution to the 1S -2S transition omits the spin-dependent couplings such as b 3 in(3.26). This is because they assume prior to calculating the energy levels that these couplings are negligible compared to a NR 200 and c 00 , on the basis of the existing experimental constraints given in[44].…”

mentioning

confidence: 99%

Testing Fundamental Physics in Antihydrogen Experiments

Charlton

Eriksson

Shore

2020

Preprint

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The recent advent of high precision antihydrogen (H) spectroscopy opens the way to stringent experimental tests of the fundamental principles underlying particle physics and general relativity (GR), such as Lorentz and CPT invariance and the Einstein Equivalence Principle (EEP), on pure antimatter systems. In this paper, the nature and implications of these tests is investigated, with special reference to the ALPHA antihydrogen programme at CERN. This is underpinned by a theoretical review of the role of antiparticles, causality and fundamental symmetries in relativistic quantum field theory (QFT) and the theory of time measurement in GR. Low-energy effective theories which break Lorentz and CPT symmetry, or the Strong Equivalence Principle (SEP), are then introduced, together with a review of several 'fifth force' scenarios involving new long-range forces which would effectively violate the universality of free-fall, or Weak Equivalence Principle (WEPff). The possible role of CPT violation in determining the matter-antimatter asymmetry of the Universe is discussed. Explicit calculations are given for the dependence on possible Lorentz and CPT violating couplings of the transition frequencies amongst the 1S, 2S and 2P hyperfine states measured in the magnetic field of the ALPHA trap and the resulting bounds are compared with existing limits. An analysis of the implications for the EEP of current free-fall and spectroscopic measurements with antihydrogen is presented and existing and potential bounds on WEPff and the universality of clocks (WEPc) are derived, together with constraints on fifth forces. Future prospects for high-precision antihydrogen spectroscopy, free-fall and gravitational redshift experiments, and anti-atom matter-wave interferometry are described and experimental possibilities involving other antimatter species are briefly outlined.

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“…Articles from most of the main experiments now working at the AD inform about their current status, and provide a glimpse of their visions for how they plan to exploit the ELENA upgrade to increase their physics output and explore new areas. The meeting was kicked off with theoretical inputs to inform the meeting on what, from a theoretical viewpoint, we might learn from the experimental efforts [19][20][21].…”

mentioning

confidence: 99%

Antiproton physics in the ELENA era

Madsen¹

2018

Phil. Trans. R. Soc. A.

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Prospects for testing Lorentz and CPT symmetry with antiprotons

Cited by 4 publications

References 39 publications

Antihydrogen and Fundamental Physics

Antihydrogen and Fundamental Physics

Testing Fundamental Physics in Antihydrogen Experiments

Antiproton physics in the ELENA era

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