Muon g − 2 in gauge mediation without SUSY CP problem

Ibe, Masahiro; Kobayashi, Shin; Nakayama, Yuhei; Shirai, Satoshi

doi:10.1007/jhep07(2021)098

Cited by 22 publications

(18 citation statements)

References 157 publications

(217 reference statements)

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“…One may generally think that LFV processes are linked by these anomalies [37][38][39][40]. In fact, much effort has been invested in order to construct UV models that explain the anomalies without introducing large LFVs [41][42][43][44][45][46][47][48]. We note that our mechanism works (even more efficiently) for suppressed but nonzero LFV interactions, including these models.…”

Section: Spontaneous Leptoflavorgenesismentioning

confidence: 93%

Leptoflavorgenesis: baryon asymmetry of the Universe from lepton flavor violation

Mukaida,

Schmitz,

Yamada

2021

Preprint

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Charged-lepton flavor violation (CLFV) is a smoking-gun signature of physics beyond the Standard Model. The discovery of CLFV in upcoming experiments would indicate that CLFV processes must have been efficient in the early Universe at relatively low temperatures. In this letter, we point out that such efficient CLFV interactions open up new ways of creating the baryon asymmetry of the Universe. First, we revisit the two-loop corrections from charged-lepton Yukawa interactions to the chemical transport in the Standard Model plasma, which imply that nonzero lepton flavor asymmetries summing up to B − L = 0 are enough to generate the baryon asymmetry. Then, we describe two scenarios of what we call leptoflavorgenesis, where efficient CLFV processes are responsible for the generation of primordial lepton flavor asymmetries that are subsequently converted to a baryon asymmetry by weak sphaleron processes. Here, the conversion factor from lepton flavor asymmetry to baryon asymmetry is suppressed by charged-lepton Yukawa couplings squared, which provides a natural explanation for the smallness of the observed baryon-to-photon ratio.Introduction. -The Standard Model (SM) of particle physics has been established observationally after the discovery of Higgs boson. Its classical action enjoys the accidental global symmetry U (1)corresponding to the conservation of the baryon charge B and the flavored lepton charges L e,µ,τ . Quantum mechanically, U (1) B +L is violated by the chiral anomaly [1].Although suppressed in the vacuum, B + L violation by means of weak sphaleron processes is efficient at temperatures 10 2 GeV T 10 12 GeV [2-5]. Also, the discovery of neutrino oscillations revealed that the lepton flavor symmetries, U (1) L e −L µ × U (1) L µ −L τ , are violated [6-10], which further implies the violation of U (1) B −L if neutrinos are Majorana fermions [11]. However, such interactions are so feeble that they could be inefficient up to T B −L ∼ 10 13 GeV, depending on possible UV completions of the neutrino sector.Charged-lepton flavor violation (CLFV) is currently attracting a lot of attention [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], since its discovery would undoubtedly imply physics beyond the SM (plus massive neutrinos), enabling us to probe new physics at extremely high energy scales, such as O 10 8 GeV by µ → eγ [13] and O 10 9 GeV by µ → ea, where a is a pseudo-Nambu-Goldstone boson like an axion or familon [22,28]. 1 This is because CLFV induced by the SM neutrino masses is extremely suppressed by the GIM mechanism [49]. Furthermore, if CLFV should be observed in upcoming experiments, we would learn that CLFV interactions must have been efficient at relatively low temperatures in the early Universe. For instance, the discovery of µ → eγ would imply that U (1) L e −L µ violating interactions are efficient at T 1 Anomalies and hints of lepton flavor universality violation in observables such as rare B meson decays [29][30][31] (see also Refs. [32,33]) and the anomalous magnetic moment ...

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Section: Spontaneous Leptoflavorgenesismentioning

confidence: 93%

Leptoflavorgenesis: baryon asymmetry of the Universe from lepton flavor violation

Mukaida,

Schmitz,

Yamada

2021

Preprint

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“…There have been an appreciable number of SUSY-based analyses on (g − 2) µ after the announcement of Fermilab result [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][54][55][56][57]. Some of the above works also involve dark matter constraints.…”

Section: Yukawa Threshold Correctionsmentioning

confidence: 99%

Muon and Electron $(g-2)$ Anomalies with Non-Holomorphic Interactions in MSSM

Chakraborti¹,

Chattopadhyay²,

Mukherjee³

2021

Preprint

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The recent Fermilab muon g − 2 result and the same for electron due to fine-structure constant measurement through 133 Cs matter-wave interferometry are probed in relation to MSSM with non-holomorphic (NH) trilinear soft SUSY breaking terms, referred as NHSSM. Supersymmetric contributions to charged lepton (g − 2) l can be enhanced via the new trilinear terms involving a wrong Higgs coupling with left and right-handed scalars. Bino-slepton loop is used to enhance the SUSY contribution to g − 2 where wino mass stays at 1.5 TeV and the left and right slepton mass parameters for the first two generations are considered to be the same. Unlike many MSSM based analyses, the model does not require a light electroweakino, or light sleptons, or unequal left and right slepton masses, or a very large higgsino mass parameter. First part of the analysis involves (g − 2) µ constraint along with limits from Higgs mass, B-physics, collider data, direct detection of dark matter (DM) while focusing on a higgsino DM which is underabundant in nature. We then impose the constraint from electron g − 2 where a large Yukawa threshold corrections (an outcome of NHSSM) and opposite signs of trilinear NH coefficients associated with µ and e fields are used to satisfy the dual limits of ∆a µ and ∆a e (where the latter comes with negative sign).Varying Yukawa threshold corrections further provide the necessary flavor-dependent enhancement of ∆a e /m 2 e compared to that of ∆a µ /m 2 µ . A larger Yukawa threshold correction through A e for y e also takes away the direct proportionality of a e with respect to tan β. With a finite intercept, a e becomes only an increasing function of tan β. We identified the available parameter space in the two cases while also applying the ATLAS data on slepton pair production in the plane of slepton mass parameter and the mass of the lightest neutralino.

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“…The NUHM3 model is embedded in the computer code Isajet 7.88 [57] which we use for sparticle spectra generation and for evaluation of ∆a SUSY µ . A number of other papers have recently appeared regarding a SUSY interpretation of the Fermilab/BNL (g − 2) µ anomaly [58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76].…”

Section: Introductionmentioning

confidence: 99%

Anomalous muon magnetic moment, supersymmetry, naturalness, LHC search limits and the landscape

Baer,

Barger,

Serce

2021

Preprint

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The recent measurement of the muon anomalous magnetic moment a µ ≡ (g − 2) µ /2 by the Fermilab Muon g − 2 experiment sharpens an earlier discrepancy between theory and the BNL E821 experiment. We examine the predicted ∆a µ ≡ a µ (exp) − a µ (th) in the context of supersymmetry with low electroweak naturalness (restricting to models which give a plausible explanation for the magnitude of the weak scale). A global analysis including LHC Higgs mass and sparticle search limits points to interpretation within the normal scalar mass hierarchy (NSMH) SUSY model wherein first/second generation matter scalars are much lighter than third generation scalars. We present a benchmark model for a viable NSMH point which is natural, obeys LHC Higgs and sparticle mass constraints and explains the muon magnetic anomaly. Aside from NSMH models, then we find the (g − 2) µ anomaly cannot be explained within the context of natural SUSY, where a variety of data point to decoupled first/second generation scalars. The situation is worse within the string landscape where first/second generation matter scalars are pulled to values in the 10 − 50 TeV range. An alternative interpretation for SUSY models with decoupled scalar masses is that perhaps the recent lattice evaluation of the hadronic vacuum polarization could be confirmed which leads to a Standard Model theory-experiment agreement in which case there is no anomaly.

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Muon g − 2 in gauge mediation without SUSY CP problem

Cited by 22 publications

References 157 publications

Leptoflavorgenesis: baryon asymmetry of the Universe from lepton flavor violation

Leptoflavorgenesis: baryon asymmetry of the Universe from lepton flavor violation

Muon and Electron $(g-2)$ Anomalies with Non-Holomorphic Interactions in MSSM

Anomalous muon magnetic moment, supersymmetry, naturalness, LHC search limits and the landscape

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