Revealing the structure of light pseudoscalar mesons at the electron-ion collider

Abstract Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model, which interact with the known particles through higher-dimensional operators suppressed by the mass scale Λ of the new-physics sector. Starting from the most general dimension-5 interactions, we discuss in detail the evolution of the ALP couplings from the new-physics scale to energies at and below the scale of electroweak symmetry breaking. We derive the relevant anomalous dimensions at two-loop order in gauge couplings and one-loop order in Yukawa interactions, carefully considering the treatment of a redundant operator involving an ALP coupling to the Higgs current. We account for one-loop (and partially two-loop) matching contributions at the weak scale, including in particular flavor-changing effects. The relations between different equivalent forms of the effective Lagrangian are discussed in detail. We also construct the effective chiral Lagrangian for an ALP interacting with photons and light pseudoscalar mesons, pointing out important differences with the corresponding Lagrangian for the QCD axion.

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Strong Couplings from Weak Decays of Pseudoscalar Mesons

Physical Review ◽

10.1103/physrev.184.1782 ◽

1969 ◽

Vol 184 (5) ◽

pp. 1782-1787 ◽

Cited By ~ 4

Author(s):

Marcel Wellner

Keyword(s):

Weak Decays ◽

Pseudoscalar Mesons

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Chiral symmetry suppression of two-photon couplings to excited SU(3) pseudoscalar mesons

Physics Letters B ◽

10.1016/0370-2693(88)90018-4 ◽

1988 ◽

Vol 202 (2) ◽

pp. 251-256 ◽

Cited By ~ 2

Author(s):

A. Lundin ◽

H. Snellman

Keyword(s):

Chiral Symmetry ◽

Two Photon ◽

Pseudoscalar Mesons

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Pseudoscalar mesons in hot, dense matter

Physical Review C ◽

10.1103/physrevc.70.025204 ◽

2004 ◽

Vol 70 (2) ◽

Cited By ~ 43

Author(s):

P. Costa ◽

M. C. Ruivo ◽

C. A. de Sousa ◽

Yu. L. Kalinovsky

Keyword(s):

Dense Matter ◽

Pseudoscalar Mesons

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Study of Rare Mesonic Decays Involving Di-Neutrinos in Their Final State

Advances in High Energy Physics ◽

10.1155/2018/4176840 ◽

2018 ◽

Vol 2018 ◽

pp. 1-20

Author(s):

Azeem Mir ◽

Farida Tahir ◽

Shakeel Mahmood ◽

Shi- Hai Dong

Keyword(s):

Branching Fractions ◽

New Physics ◽

Supersymmetric Model ◽

Final State ◽

Yukawa Couplings ◽

Leptonic Decays ◽

Pseudoscalar Mesons ◽

Theoretical Predictions ◽

Minimal Supersymmetric Model

We have studied phenomenological implication of R-parity violating (Rp) Minimal Supersymmetric Model (MSSM) via analyses of pure leptonic (M→νν¯) and semileptonic decays of pseudoscalar mesons (M→Xνν¯). These analyses involve comparison between theoretical predictions made by Rp MSSM and the Standard Model (SM) with the experimental results like branching fractions (Br) of the said process. We have found, in general, that Rp contribution dominates over the SM contribution, i.e., by a factor of 10 for the pure leptonic decays of KL,S and by 102 and 104 in case of Bs and Bd, respectively. Furthermore, the limits obtained on Rp Yukawa couplings (λαkβ′λαkγ′⁎) by using Br (M→Xνν¯) are used to calculate Br (M→νν¯). This demonstrates the role of Rp MSSM as a viable model for the study of new physics contribution in rare decays at places like Super B factories, KOTO (J-PARC) and NA62 at CERN.

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