Peter Stangl
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View article: On the interplay of constraints from $$B_{s},$$ D, and K meson mixing in $$Z^\prime $$ models with implications for $$b\!\rightarrow \! s \nu {\bar{\nu }}$$ transitions
On the interplay of constraints from $$B_{s},$$ D, and K meson mixing in $$Z^\prime $$ models with implications for $$b\!\rightarrow \! s \nu {\bar{\nu }}$$ transitions Open
Within $$Z^\prime $$ models, neutral meson mixing severely constrains beyond the Standard Model (SM) effects in flavour changing neutral current (FCNC) processes. However, in certain regions of the $$Z^\prime $$ parameter space, th…
View article: On the Interplay of Constraints from $B_s$, $D$, and $K$ Meson Mixing in $Z^\prime$ Models with Implications for $b\to s ν\barν$ Transitions
On the Interplay of Constraints from $B_s$, $D$, and $K$ Meson Mixing in $Z^\prime$ Models with Implications for $b\to s ν\barν$ Transitions Open
Within $Z^\prime$ models, neutral meson mixing severely constrains beyond the Standard Model (SM) effects in flavour changing neutral current (FCNC) processes. However, in certain regions of the $Z^\prime$ parameter space, the contribution…
View article: Workshop summary -- Kaons@CERN 2023
Workshop summary -- Kaons@CERN 2023 Open
Kaon physics is at a turning point -- while the rare-kaon experiments NA62 and KOTO are in full swing, the end of their lifetime is approaching and the future experimental landscape needs to be defined. With HIKE, KOTO-II and LHCb-Phase-II…
View article: Computing Tools for Effective Field Theories
Computing Tools for Effective Field Theories Open
In recent years, theoretical and phenomenological studies with effective field theories have become a trending and prolific line of research in the field of high-energy physics. In order to discuss present and future prospects concerning a…
View article: SMEFT Restrictions On Exclusive $b \to u \ell ν$ Decays
SMEFT Restrictions On Exclusive $b \to u \ell ν$ Decays Open
Exclusive semileptonic $b$ hadron decays ($b \to u \ell ν$) serve as a sandbox for probing strong and electroweak interactions and for extracting the CKM element $V_{ub}$. Instead, this work investigates their underexplored potential to re…
View article: Rare b decays meet high-mass Drell-Yan
Rare b decays meet high-mass Drell-Yan Open
A bstract Rare b hadron decays are considered excellent probes of new semileptonic four-fermion interactions of microscopic origin. However, the same interactions also correct the high-mass Drell-Yan tails. In this work, we revisit the fir…
View article: Rare $b$ decays meet high-mass Drell-Yan
Rare $b$ decays meet high-mass Drell-Yan Open
Rare $b$ hadron decays are considered excellent probes of new semileptonic four-fermion interactions of microscopic origin. However, the same interactions also correct the high-mass Drell-Yan tails. In this work, we revisit the first state…
View article: Muonic force behind flavor anomalies
Muonic force behind flavor anomalies Open
A bstract We develop an economical theoretical framework for combined explanations of the flavor physics anomalies involving muons: ( g − 2) μ , $$ {R}_{K^{\left(\ast \right)}} $$ , and b → sμ + μ − angular distributions and branchi…
View article: On $(g-2)_\mu$ From Gauged $\mathrm{U}(1)_X$
On $(g-2)_\mu$ From Gauged $\mathrm{U}(1)_X$ Open
We investigate an economical explanation for the $(g-2)_\mu$ anomaly with a neutral vector boson from a spontaneously broken $\mathrm{U}(1)_X$ gauge symmetry. The Standard Model fermion content is minimally extended by 3 right-handed neutr…
View article: Addressing the muon anomalies with muon-flavored leptoquarks
Addressing the muon anomalies with muon-flavored leptoquarks Open
Significant deviations from Standard Model (SM) predictions have been observed in $ b \to s \mu^+ \mu^-$ decays and in the muon $g-2$. Scalar leptoquark extensions of the SM are known to be able to address these anomalies, but generically …
View article: Addressing the Muon Anomalies With Muon-Flavored Leptoquarks
Addressing the Muon Anomalies With Muon-Flavored Leptoquarks Open
Significant deviations from Standard Model (SM) predictions have been observed in $ b \to s μ^+ μ^-$ decays and in the muon $g-2$. Scalar leptoquark extensions of the SM are known to be able to address these anomalies, but generically give…
View article: flav-io/flavio: v2.3.1
flav-io/flavio: v2.3.1 Open
This minor release adds the recent LHCb measurements of the Bs→φμμ angular observables FL, S3, S4, and S7 from arXiv:2107.13428.
View article: A model of muon anomalies
A model of muon anomalies Open
The Standard Model (SM) is augmented with a U(1)B−3Lμ gauge symmetry spontaneously broken above
\nthe TeV scale when an SM-singlet scalar condenses. Scalar leptoquarks S1(3) = (3, 1(3), 1/3) charged under
\nU(1)B−3Lμ mediate the intriguing…
View article: smelli – the SMEFT Likelihood
smelli – the SMEFT Likelihood Open
I present the Python package smelli that implements a global likelihood function in the space of dimension-six Wilson coefficients in the Standard Model Effective Field Theory (SMEFT). The likelihood includes contributions from a large num…
View article: Minimal 4D Composite Higgs Models Under Current LHC Constraints
Minimal 4D Composite Higgs Models Under Current LHC Constraints Open
We present preliminary results of the first convergent global fits of several minimal composite Higgs models. Our fits are performed using the differential evolution optimisation package Diver. A variety of physical constraints are taken i…
View article: Computing Tools for the SMEFT
Computing Tools for the SMEFT Open
The increasing interest in the phenomenology of the Standard Model Effective Field Theory (SMEFT), has led to the development of a wide spectrum of public codes which implement automatically different aspects of the SMEFT for phenomenologi…
View article: Flavour anomalies and (fundamental) partial compositeness
Flavour anomalies and (fundamental) partial compositeness Open
Several measurements of B-meson decay observables show deviations from Standard Model (SM) predictions, some of them hinting at violation of lepton flavour universality (LFU). I discusses how the anomalies in rare B decays can be explained…
View article: Computing Tools for the SMEFT
Computing Tools for the SMEFT Open
International audience
View article: Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite Higgs Models
Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite Higgs Models Open
Composite Higgs models (CHMs) offer an elegant solution to the naturalness problem of the Standard Model (SM). Their direct effects at particle colliders like the Large Hadron Collider (LHC) are thus of central interest. While no direct ef…
View article: Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite\n Higgs Models
Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite\n Higgs Models Open
Composite Higgs models (CHMs) offer an elegant solution to the naturalness\nproblem of the Standard Model (SM). Their direct effects at particle colliders\nlike the Large Hadron Collider (LHC) are thus of central interest. While no\ndirect…
View article: Flavor physics and flavor anomalies in minimal fundamental partial compositeness
Flavor physics and flavor anomalies in minimal fundamental partial compositeness Open
Partial compositeness is a key ingredient of models where the electroweak\nsymmetry is broken by a composite Higgs state. Recently, a UV completion of\npartial compositeness was proposed, featuring a new strongly coupled gauge\ninteraction…
View article: flav-io/flavio v0.27
flav-io/flavio v0.27 Open
Running masses and couplings from CRunDec This release replaces the old implementation of running quark masses and couplings by making use of the CRunDec package by F. Herren and M. Steinhauser. This was made possible by directly wrapping …
View article: flav-io/flavio v0.25
flav-io/flavio v0.25 Open
This release brings some major changes to the way new physics Wilson coefficients are specified, including some backwards-incompatible ones and changes in dependencies. Please read on as you might have to update your code. New Wilson coeff…