TY - JOUR
T1 - Sensitivity to light weakly-coupled new physics at the precision frontier
AU - Le Dall, Matthias
AU - Pospelov, Maxim
AU - Ritz, Adam
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/7/31
Y1 - 2015/7/31
N2 - Precision measurements of rare particle physics phenomena (flavor oscillations and decays, electric dipole moments, etc.) are often sensitive to the effects of new physics encoded in higher-dimensional operators with Wilson coefficients given by C/(ΛNP)n, where C is dimensionless, n≥1, and ΛNP is an energy scale. Many extensions of the Standard Model predict that ΛNP should be at the electroweak scale or above, and the search for new short-distance physics is often stated as the primary goal of experiments at the precision frontier. In rather general terms, we investigate the alternative possibility - C1, and ΛNPmW - to identify classes of precision measurements sensitive to light new physics (hidden sectors) that do not require an ultraviolet completion with additional states at or above the electroweak scale. We find that hadronic electric dipole moments, lepton number and flavor violation, nonuniversality, as well as lepton g-2 can be induced at interesting levels by hidden sectors with light degrees of freedom. In contrast, many hadronic flavor- and baryon number-violating observables, and precision probes of charged currents, typically require new physics with ΛNPmW. Among the leptonic observables, we find that a nonzero electron electric dipole moment near the current level of sensitivity would point to the existence of new physics at or above the electroweak scale.
AB - Precision measurements of rare particle physics phenomena (flavor oscillations and decays, electric dipole moments, etc.) are often sensitive to the effects of new physics encoded in higher-dimensional operators with Wilson coefficients given by C/(ΛNP)n, where C is dimensionless, n≥1, and ΛNP is an energy scale. Many extensions of the Standard Model predict that ΛNP should be at the electroweak scale or above, and the search for new short-distance physics is often stated as the primary goal of experiments at the precision frontier. In rather general terms, we investigate the alternative possibility - C1, and ΛNPmW - to identify classes of precision measurements sensitive to light new physics (hidden sectors) that do not require an ultraviolet completion with additional states at or above the electroweak scale. We find that hadronic electric dipole moments, lepton number and flavor violation, nonuniversality, as well as lepton g-2 can be induced at interesting levels by hidden sectors with light degrees of freedom. In contrast, many hadronic flavor- and baryon number-violating observables, and precision probes of charged currents, typically require new physics with ΛNPmW. Among the leptonic observables, we find that a nonzero electron electric dipole moment near the current level of sensitivity would point to the existence of new physics at or above the electroweak scale.
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U2 - 10.1103/PhysRevD.92.016010
DO - 10.1103/PhysRevD.92.016010
M3 - Article
AN - SCOPUS:84939177438
SN - 1550-7998
VL - 92
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 1
M1 - 016010
ER -