Flavor Seesaw Mechanism

In the Standard Model, Yukawa couplings parametrize the fermion masses and mixing angles with the exception of neutrino masses. The hierarchies and apparent regularities among the quark and lepton masses are, however, otherwise a mystery. We propose a new class of models having vector-like fermions that can potentially address this problem and provide a new mechanism for fermion mass generation. The masses of the third and second generations of quarks and leptons arise at tree level via the seesaw mechanism from new physics at moderately higher scales, while loop corrections produce the masses for the first generation. This mechanism has a number of interesting and testable consequences. Among them are unavoidable flavor-violating signals at the upcoming experiments and the fact that neutrinos have naturally only Dirac masses.Comment: 25 pages + references, 5 figures, 5 tables, matches published versio

Semi-secretly interacting ALP as an explanation of Fermilab muon g−2g-2 measurement

The muon anomalous magnetic moment measurement has, for more than a decade, been a long-standing anomaly hinting the physics beyond the Standard Model (BSM). The recently announced results from muon $g-2$ collaboration, corresponding to 3.3$\sigma$ deviation from Standard Model value (4.2$\sigma$ in combination with previous measurement) are strengthening the need for new physics coupled to muons. In this letter, we propose a novel scenario in which Standard Model (SM) is augmented by an axion-like particle (ALP) and vector-like fermions. We find that such a model admits an excellent interpretation of recent muon $g-2$ measurement through quantum process featuring ALP interacting with muons and newly introduced fermions. Previously proposed explanations with ALPs utilize interactions with photons and/or SM fermions. Therefore, in this letter we complement and extend such scenarios. We also discuss collider prospects for the model as well as the possibility that ALP is long lived or stable dark matter (DM) candidate.Comment: 5 pages, 5 figures, matches version accepted for publication in PL

Probing New Physics at Future Tau Neutrino Telescopes

We systematically investigate new physics scenarios that can modify theinteractions between neutrinos and matter at upcoming tau neutrino telescopes,which will test neutrino-proton collisions with energies \gtrsim 45~{\rmTeV}, and can provide unique insights to the elusive tau neutrino. At suchhigh energy scales, the impact of parton distribution functions of second andthird generations of quarks (usually suppressed) can be comparable to thecontribution of first generation with small momentum fraction, hence making tauneutrino telescopes an excellent facility to probe new physics associated withsecond and third families. Among an inclusive set of particle physics models,we identify new physics scenarios at tree level that can give competitivecontributions to the neutrino cross sections while staying within laboratoryconstraints: charged/neutral Higgs and leptoquarks. Our analysis is close tothe actual experimental configurations of the telescopes, and we perform a$\chi^2$-analysis on the energy and angular distributions of the tau events. Bynumerically solving the propagation equations of neutrino and tau fluxes inmatter, we obtain the sensitivities of representative upcoming tau neutrinotelescopes, GRAND, POEMMA and Trinity, to the charged Higgs and leptoquarkmodels. While each of the experiments can achieve a sensitivity better than thecurrent collider reaches for certain models, their combination is remarkablycomplementary in probing the new physics. In particular, the new physics willaffect the energy and angular distributions in different ways at thosetelescopes.<br

Muon g − 2 anomaly and neutrino magnetic moments

We show that a unified framework based on an $SU(2)_H$ horizontal symmetry which generates a naturally large neutrino transition magnetic moment and explains the XENON1T electron recoil excess also predicts a positive shift in the muon anomalous magnetic moment. This shift is of the right magnitude to be consistent with the Brookhaven measurement as well as the recent Fermilab measurement of the muon $g-2$. A relatively light neutral scalar from a Higgs doublet with mass near 100 GeV contributes to muon $g-2$, while its charged partner induces the neutrino magnetic moment. We analyze the collider tests of this framework and find that the HL-LHC can probe the entire parameter space of these models

Enterprise support policy and territorial cohesion: The Czech Republic (2007-2013)

The intention of this paper is to evaluate whether the spatial distribution of Structural Funds (SF) for enterprise support interventions follows the relevant territorial cohesion objectives specified in the strategic documents of the Czech Republic in the programming period 2007-2013. The evidence provided suggests mixed results. A relatively high SF allocation to the regions, characterized by strong agglomeration economies and a strong entrepreneurial climate, supports the competitiveness objective, particularly for innovation-oriented interventions. Nevertheless, little support is given to the objective of balanced development because socio-economically disadvantaged regions do not receive a higher SF allocation, in particular traditional industrial regions suffering from industrial decline, high unemployment and with a poor entrepreneurial climate. In this regard, the absorption capacity concept is emphasized as being important for explaining the spatial distribution of SF. © 2017, Editura Universitatii din Bucuresti. All rights reserved.GACR, Grantová Agentura České Republiky; OCIO, Office of Chief Information Officer; UTB, Univerzita Tomáše Bati ve ZlíněCzech Science Foundation [16-22141S

Geschlecht im Kontext verschärfter ökonomischer Krisen: Tagung der Schweizerischen Gesellschaft für Geschlechterforschung SGGF vom 7. bis 8. September 2012 an der Universität Bern

"Die am 7. und 8. September 2012 von der Schweizerischen Gesellschaft für Geschlechterforschung ausgerichtete Fachtagung in Bern 'Geschlecht im Kontext verschärfter ökonomischer Krisen' befasste sich mit einer sehr aktuellen Problematik. Wirtschaftliche Krisen und deren Folgen für Geschlecht und Geschlechterverhältnisse wurden hier kritisch reflektiert und diskutiert." (Autorenreferat)"Given that crises are occurring more and more frequently, the 2012 conference of the Swiss Association for Gender Studies (SGGF) focused on the consequences of economic and political changes, as well as their effect on gender and gender relations. Such a highly topical set of problems was discussed at the two-day conference held in Bern on 7/8 September." (author's abstract

Flavoured Neutrinoless Double Beta Decay

We discuss a mechanism of neutrinoless double beta decay, where neutrinos of different flavours come into play. This is realized by effective flavour-violating scalar interactions. As one consequence, we find that within the normal mass ordering the neutrino effective mass may no longer vanish due to contributions from other flavours. We evaluate the necessary nuclear matrix elements, consider the interference between the standard diagram and the new scalar one, and analyze a UV-complete model that realizes the scalar interaction. Tests of the complete model are possible at colliders and future neutrino experiments. Our scenario represents an alternative mechanism for neutrinoless double beta decay, where nevertheless lepton number violation resides only in Majorana mass terms of light neutrinos.Comment: 11 pages, 5 figure

On the law of killed exponential functionals

For two independent L\'{e}vy processes $\xi$ and $\eta$ and an exponentially distributed random variable $\tau$ with parameter $q>0$ that is independent of $\xi$ and $\eta$, the killed exponential functional is given by $V_{q,\xi,\eta} := \int_0^\tau \mathrm{e}^{-\xi_{s-}} \, \mathrm{d} \eta_s$. With the killed exponential functional arising as the stationary distribution of a Markov process, we calculate the infinitesimal generator of the process and use it to derive different distributional equations describing the law of $V_{q,\xi,\eta}$, as well as functional equations for its Lebesgue density in the absolutely continuous case. Various special cases and examples are considered, yielding more explicit information on the law of the killed exponential functional and illustrating the applications of the equations obtained. Interpreting the case $q=0$ as $\tau=\infty$ leads to the classical exponential functional $\int_0^\infty \mathrm{e}^{-\xi_{s-}} \, \mathrm{d} \eta_s$, allowing to extend many previous results to include killing