Resolving electron and muon g2 within the 2HDM

Sudip Jana (Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany) ; Vishnu P. K. (Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA) ; Shaikh Saad (Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA)

Recent precise measurement of the electron anomalous magnetic moment (AMM) adds to the longstanding tension of the muon AMM and together strongly point toward physics beyond the Standard Model (BSM). In this work, we propose a solution to both anomalies in an economical fashion via a light scalar that emerges from a second Higgs doublet and resides in the O(10)MeV to O(1)GeV mass range yielding the right sizes and signs for these deviations due to one-loop and two-loop dominance for the muon and the electron, respectively. A scalar of this type is subject to a number of various experimental constraints, however, as we show, it can remain sufficiently light by evading all experimental bounds and has the great potential to be discovered in the near-future low-energy experiments. The analysis provided here is equally applicable to any BSM scenario for which a light scalar is allowed to have sizable flavor-diagonal couplings to the charged leptons. In addition to the light scalar, our theory predicts the existence of a nearly degenerate charged scalar and a pseudoscalar, which have masses of the order of the electroweak scale. We analyze possible ways to probe new-physics signals at colliders and find that this scenario can be tested at the LHC by looking at the novel process ppH±H±jjl±l±jj+ET via same-sign pair production of charged Higgs bosons.

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      "source": "APS", 
      "value": "Recent precise measurement of the electron anomalous magnetic moment (AMM) adds to the longstanding tension of the muon AMM and together strongly point toward physics beyond the Standard Model (BSM). In this work, we propose a solution to both anomalies in an economical fashion via a light scalar that emerges from a second Higgs doublet and resides in the <math><mrow><mi>O</mi><mo>(</mo><mn>10</mn><mo>)</mo><mtext>\u2212</mtext><mi>MeV</mi></mrow></math> to <math><mrow><mi>O</mi><mo>(</mo><mn>1</mn><mo>)</mo><mtext>\u2212</mtext><mi>GeV</mi></mrow></math> mass range yielding the right sizes and signs for these deviations due to one-loop and two-loop dominance for the muon and the electron, respectively. A scalar of this type is subject to a number of various experimental constraints, however, as we show, it can remain sufficiently light by evading all experimental bounds and has the great potential to be discovered in the near-future low-energy experiments. The analysis provided here is equally applicable to any BSM scenario for which a light scalar is allowed to have sizable flavor-diagonal couplings to the charged leptons. In addition to the light scalar, our theory predicts the existence of a nearly degenerate charged scalar and a pseudoscalar, which have masses of the order of the electroweak scale. We analyze possible ways to probe new-physics signals at colliders and find that this scenario can be tested at the LHC by looking at the novel process <math><mrow><mi>p</mi><mi>p</mi><mo>\u2192</mo><msup><mrow><mi>H</mi></mrow><mrow><mo>\u00b1</mo></mrow></msup><msup><mrow><mi>H</mi></mrow><mrow><mo>\u00b1</mo></mrow></msup><mi>j</mi><mi>j</mi><mo>\u2192</mo><msup><mrow><mi>l</mi></mrow><mrow><mo>\u00b1</mo></mrow></msup><msup><mrow><mi>l</mi></mrow><mrow><mo>\u00b1</mo></mrow></msup><mi>j</mi><mi>j</mi><mo>+</mo><msub><mrow><mrow><mi>E</mi></mrow></mrow><mrow><mi>T</mi></mrow></msub></mrow></math> via same-sign pair production of charged Higgs bosons."
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Published on:
29 June 2020
Publisher:
APS
Published in:
Physical Review D , Volume 101 (2020)
Issue 11
DOI:
https://doi.org/10.1103/PhysRevD.101.115037
arXiv:
2003.03386
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

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