Lepton flavour violation; Lepton Flavour Universality Violation; Higher dimensional operators; Physics beyond the Standard Model; Loop calculations; B meson decays; Flavour; Dark Matter; Effective Field Theories
Manzari Claudio Andrea, Coutinho Antonio M., Crivellin Andreas (2021), Modified lepton couplings and the Cabibbo-angle anomaly, in
PoS, LHCP2020, 242-242, PoS, Trieste LHCP2020, 242-242.
Bishara Fady, Englert Philipp, Grojean Christophe, Montull Marc, Panico Giuliano, Rossia Alejo N. (2020), A new precision process at FCC-hh: the diphoton leptonic Wh channel, in
Journal of High Energy Physics, 2020(7), 75-75.
Calibbi Lorenzo, Crivellin Andreas, Kirk Fiona, Manzari Claudio Andrea, Vernazza Leonardo (2020), $Z^\prime$ models with less-minimal flavour violation, in
Phys. Rev. D, 101(9), 095003-095003.
Crivellin Andreas, Gross Christian, Pokorski Stefan, Vernazza Leonardo (2020), Correlating $ε^\prime/ε$ to hadronic $B$ decays via $U(2)^3$ flavour symmetry, in
Phys. Rev. D, 101(1), 015022-015022.
Crivellin Andreas, Müller Dario, Saturnino Francesco (2020), Flavor Phenomenology of the Leptoquark Singlet-Triplet Model, in
JHEP, 06, 020-020.
Coutinho Antonio M., Crivellin Andreas, Manzari Claudio Andrea (2020), Global Fit to Modified Neutrino Couplings and the Cabibbo-Angle Anomaly, in
Phys. Rev. Lett., 125(7), 071802-071802.
Crivellin Andreas, Hoferichter Martin, Manzari Claudio Andrea, Montull Marc (2020), Hadronic Vacuum Polarization: $(g-2)_μ$ versus Global Electroweak Fits, in
Phys. Rev. Lett., 125(9), 091801-091801.
Crivellin Andreas, Müller Dario, Saturnino Francesco (2020), Leptoquarks in oblique corrections and Higgs signal strength: status and prospects, in
JHEP, 11, 094-094.
Aoyama T., others (2020), The anomalous magnetic moment of the muon in the Standard Model, in
Phys. Rept., 887, 1-166.
Crivellin Andreas, Hoferichter Martin (2020), β Decays as Sensitive Probes of Lepton Flavor Universality, in
Phys. Rev. Lett., 125(11), 111801-111801.
Crivellin Andreas, Müller Dario, Wiegand Christoph (2019), $b\to s\ell^+\ell^-$ transitions in two-Higgs-doublet models, in
JHEP, 06, 119-119.
Blanke Monika, Crivellin Andreas, Kitahara Teppei, Moscati Marta, Nierste Ulrich, Nišandžić Ivan (2019), Addendum to Impact of polarization observables and $B_c\to τ ν$ on new physics explanations of the $b\to c τ ν$ anomaly'', in
Phys.Rev.D, 035035.
Crivellin Andreas, Hoferichter M. (2019), Combined explanations of $(g-2)_μ$, $(g-2)_e$ and implications for a large muon EDM, in
An Alpine LHC Physics Summit 2019, 29-34, Nuovo Cim., Pisa29-34.
Crivellin Andreas, Saturnino Francesco (2019), Correlating tauonic $B$ decays with the neutron electric dipole moment via a scalar leptoquark, in
Phys. Rev. D, 100(11), 115014-115014.
Cirigliano Vincenzo, Crivellin Andreas, Dekens Wouter, de Vries Jordy, Hoferichter Martin, Mereghetti Emanuele (2019), CP Violation in Higgs-Gauge Interactions: From Tabletop Experiments to the LHC, in
Phys. Rev. Lett., 123(5), 051801-051801.
Algueró Marcel, Capdevila Bernat, Crivellin Andreas, Descotes-Genon Sébastien, Masjuan Pere, Matias Joaquim, Novoa Brunet Martín, Virto Javier (2019), Emerging patterns of New Physics with and without Lepton Flavour Universal contributions, in
Eur. Phys. J. C, 79(8), 714-714.
Crivellin Andreas (2019), Explaining the Flavor Anomalies with a Vector Leptoquark, in
54th Rencontres de Moriond on QCD and High Energy Interactions, 85-90, ARISF, Trieste85-90.
Arnan Pere, Crivellin Andreas, Fedele Marco, Mescia Federico (2019), Generic loop effects of new scalars and fermions in $b\to s\ell^+\ell^-$ and a vector-like $4^{\rm th}$ generation, in
JHEP, 06, 118-118.
The ultimate goal of particle physics is to uncover the fundamental constituents and interactions of matter. Currently, this is described by the Standard Model (SM) which has been tested extensively in the last decades and its last missing piece, the famous Higgs particle, was discovered at CERN in 2012. Now the focus of High Energy Physics is on the discovery of new particles and new laws of physics beyond the SM. In this way one hopes to answer great open questions, e.g. why our universe consists of matter and not antimatter or the origin and nature of Dark Matter.In addition to direct searches for new physics (NP) at the LHC searching for new resonances, precision experiments are searching for quantum effects of new particles. In this context flavour experiments are especially interesting: matter particles appear in three generations which differ by their flavour quantum number, i.e. while being otherwise identical, they differ in mass. All matter particles are grouped into three . Flavour physics studies the transitions between these three generations. In the SM the only source of flavour violation in the quark sector is the Cabibbo-Kobayashi-Maskawa (CKM) matrix while in the limit of vanishing neutrino masses, lepton flavour is exactly conserved and lepton flavour universality (LFU) violation originates only from tiny couplings of leptons to the Higgs. Therefore, flavour violation is highly suppressed in the SM and thus very sensitive to NP.For generic NP, flavour observables probe much higher energy scales than LHC searches and one can expect to find NP here, before discovering it directly in high energy collisions. In fact, while the LHC did not directly observe new particles so far, in the last years, several experiments accumulated very interesting indications for NP in semi-leptonic B meson (bound states involving a heavy bottom quark) decays. In b->c tau nu processes a combined deviation from the SM prediction of ~4 sigma has been observed and a global fit to b->s mu mu observables even prefers NP compared to the SM with a significance above the 5 sigma level. Furthermore, there is the long standing anomaly in the anomalous magnetic moment of the muon (a_mu) at the 3 sigma level. In my view, these measurements are the most compelling indication for a breakdown of the SM at high energies (disregarding neutrino masses and dark matter which can be accommodated in the SM context without significantly affecting collider observables) since its foundation over 40 years ago.The goal of this proposal is to study the implications of these intriguing hints for LFU violating NP in great detail. The model independent effective field theory approach, in which the SM is supplemented with higher dimensional operators, already uncovered possible patterns of NP contributions but has of course to be continuously updated with forthcoming experimental data. Concerning concrete models, leptoquarks (LQs), i.e. hypothetical new particles which couple quarks to leptons, provide a natural explanation of measured data in B and also for a_mu. Such LQs occur for example in Grand Unified Theories and a large part of this proposal is devoted to a comprehensive study of the effects of these particles. Models with Z' bosons will be examined in detail since they provide a valid explanation to the b->s mu mu anomalies, but alternative solutions will also be pursued. This research plan is thus divided into seven sub-projects: A) Leptoquarks, B) Z' models, C) Flavour in extended Pati-Salam models, D) Loop effects in b-> s mu mu and a_mu, E) Leptoquarks and Supersymmetry, F) alpha_s corrections to mu->e gamma, G) Review article: ``New Physics in the Flavour Sector''. By examining the intriguing hints for LFU violation using model building, precision calculations and phenomenological analysis, this project has the unique potential of uncovering the model of NP superseding the SM.