Preprints

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2020-12-03
12:46
OpenAccess [PUBDB-2020-04746] Preprint
et al
Measurement of time-dependent CP violation parameters in $B^0 \to K_0^SK_0^SK_0^S$ decays at Belle
[Belle Preprint 2020-17; KEK Preprint 2020-34; arXiv:2011.00793]
 GO
We measure the time-dependent $C\!P$ violation parameters in $B^{0} \to K^{0}_{S}K^{0}_{S}K^{0}_{S}$ decays using $772 \times 10^6$ $B {\mkern 1.5mu\overline{\mkern-1.5mu B \mkern-0.1mu}\mkern 0.1mu}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The obtained mixing-induced and direct $C\!P$ asymmetries are $-0.71 \pm 0.23~{\rm(stat)} \pm 0.05~{\rm(syst)}$ and $0.12 \pm 0.16~{\rm(stat)} \pm 0.05~{\rm(syst)}$, respectively. [...]
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2020-12-03
11:58
OpenAccess [PUBDB-2020-04745] Preprint
et al
Search for lepton-number- and baryon-number-violating tau decays at Belle
[Belle Preprint 2020-16; KEK Preprint 2020-33; arXiv:2010.15361]
 GO
We search for lepton-number- and baryon-number-violating decays $\tau^{-}\to\overline{p}e^{+}e^{-}$, $pe^{-}e^{-}$, $\overline{p}e^{+}\mu^{-}$, $\overline{p}e^{-}\mu^{+}$, $\overline{p}\mu^{+}\mu^{-}$, and $p\mu^{-}\mu^{-}$ using 921 fb$^{-1}$ of data, equivalent to $(841\pm12)\times 10^6$ $\tau^{+}\tau^{-}$ events, recorded with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. In the absence of a signal, $90\%$ confidence-level upper limits are set on the branching fractions of these decays in the range $(1.8$-$4.0)\times 10^{-8}$. [...]
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2020-12-03
11:35
OpenAccess [PUBDB-2020-04741] Preprint
et al
The Anomalous Case of Axion EFTs and Massive Chiral Gauge Fields
[DESY-20-194; HU-EP-20/32; arXiv:2011.10025]
 GO
We study axion effective field theories (EFTs), with a focus on axion couplings to massive chiral gauge fields. We investigate the EFT interactions that participate in processes with an axion and two gauge bosons, and we show that, when massive chiral gauge fields are present, such interactions do not entirely originate from the usual anomalous EFT terms. [...]
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2020-12-03
11:34
OpenAccess [PUBDB-2020-04739] Preprint

Two-Point Correlator of Chiral Primary Operators with a Wilson Line Defect in $\mathcal{N}=4$ SYM
[DESY-20-191; HU-EP-20/33-RTG; arXiv:2011.04678]
 GO
We study the two-point function of the stress-tensor multiplet of $\mathcal{N}=4$ SYM in the presence of a line defect. To be more precise, we focus on the single-trace operator of conformal dimension two that sits in the $20'$ irrep of the $\mathfrak{so}(6)_\text{R}$ R-symmetry, and add a Maldacena-Wilson line to the configuration which makes the two-point function non-trivial. [...]
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2020-12-03
11:32
OpenAccess [PUBDB-2020-04738] Preprint
et al
Lessons from the $B^{0,+}\to K^{*0,+}\mu^+\mu^-$ angular analyses
[DESY-20-190; HU-EP-20/30; P3H-20-064; TTP20-037; UCI-TR 2020-18; arXiv:2011.01212]
 GO
We perform an analysis within the Standard Model of $B^{0,+} \to K^{*0,+} \mu^+ \mu^-$ decays in light of the recent measurements from the LHCb experiment, showing that new data strengthen the need for sizable hadronic contributions and correlations among them. We then extend our analysis to New Physics via the Standard Model Effective Theory, and carry out a state-of-the-art fit of available $b \to s \ell^+ \ell^-$ data, including possible hadronic contributions. [...]
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2020-12-03
11:29
OpenAccess [PUBDB-2020-04737] Preprint

Two-loop analysis of classically scale-invariant models with extended Higgs sectors
[DESY-20-192; OU-HET-1077; arXiv:2011.07580]
 GO
We present the first explicit calculation of leading two-loop corrections to the Higgs trilinear coupling $\lambda_{hhh}$ in models with classical scale invariance (CSI), using the effective-potential approximation. Furthermore, we also study -- for the first time at two loops -- the relation that appears between the masses of all states in CSI theories, due to the requirement of reproducing correctly the 125-GeV Higgs-boson mass. [...]
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2020-12-03
11:27
OpenAccess [PUBDB-2020-04736] Preprint

Positivity bounds on Minimal Flavor Violation
[DESY-20-201; arXiv:2011.12855]
 GO
From general analyticity and unitarity requirements on the UV theory, positivity bounds on the Wilson coefficients of the dimension-8 operators composed of 4 fermions and two derivatives appearing in the Standard Model Effective Field Theory have been derived recently. We explore the fate of these bounds in the context of models endowed with a Minimal Flavor Violation (MFV) structure, models in which the flavor structure of higher dimensional operators is inherited from the one already contained in the Yukawa sector of the Standard Model Lagrangian. [...]
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2020-12-03
11:25
OpenAccess [PUBDB-2020-04735] Preprint

The Effective Field Theory and Perturbative Analysis for Log-Density Fields
[DESY-20-203; arXiv:2011.12280]
 GO
A logarithm transformation over the matter overdensity field $\delta$ brings information from the bispectrum and higher-order n-point functions to the power spectrum. We calculate the power spectrum for the log-transformed field $A$ at one, two and three loops using perturbation theory (PT). [...]
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2020-12-03
11:23
OpenAccess [PUBDB-2020-04734] Preprint
et al
Wash-In Leptogenesis
[CERN-TH-2020-196; DESY-20-202; RESCEU-22/20; TU-1112; arXiv:2011.09347]
 GO
We present a new leptogenesis mechanism based on the standard type-I seesaw model that successfully operates at right-handed-neutrino masses as low as a few 100 TeV. This mechanism, which we dub 'wash-in leptogenesis', does not require any CP violation in the neutrino sector and can be implemented even in the regime of strong washout. [...]
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2020-12-03
11:11
OpenAccess [PUBDB-2020-04731] Preprint
et al
Neutrino mass bounds from confronting an effective model with BOSS Lyman-alpha data
[DESY-20-174; TTK-20-36; TUM-HEP-1294/20; arXiv:2011.03050]
 GO
We present an effective model for the one-dimensional Lyman-$\alpha$ flux power spectrum far above the baryonic Jeans scale. The main new ingredient is constituted by a set of two parameters that encode the impact of small, highly non-linear scales on the one-dimensional power spectrum on large scales, where it is measured by BOSS. [...]
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