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20th LOMONOSOV CONFERENCE ON ELEMENTARY PARTICLE PHYSICS
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Addressing B-Anomalies with Leptoquarks
Rusa Mandal E-mail: Rusa.Mandal@uni-siegen.de
Center for Particle Physics Siegen (CPPS), Theoretische Physik 1, Universität Siegen, 57068 Siegen, Germany
Received January 16, 2022
In view of the current tensions observed in B-meson decays, we discuss the possibility of extending the Standard Model with scalar leptoquarks when the flavor structure is parametrized in terms of Froggatt-Nielsen charges. The Standard Model fermion mass and mixing hierarchies together with the B-anomalies restrict to only two possible solutions for the charges. Such a setup predicts sizable contributions to several other decays whose branching ratios are close to the current experimental limits.
Keywords: flavor symmetry, B-anomalies, leptoquarks.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 126-128.
A Bottom-Up Approach: The Data Driven Flavour Model
Luca Merlo E-mail: luca.merlo@uam.es
Instituto de Física TeOrica UAM/CSIC and Departamento de Física TeOrica, Universidad Autónoma de Madrid, Calle Nicolas Cabrera 13-15, Cantoblanco E-28049 Madrid, Spain
Received November 25, 2021
A bottom-up approach has been adopted to identify a flavour model that agrees with present experimental measurements. The charged fermion mass hierarchies suggest that only the top Yukawa term should be present at the renormalisable level. The flavour symmetry of the Lagrangian including the fermionic kinetic terms and only the top Yukawa is then a combination of U(2) and U(3) factors. Lighter charged fermion and active neutrino masses and quark and lepton mixings arise considering specific spurion fields. The associated phenomenology is investigated and the model turns out to have almost the same flavour protection of the minimal flavour violation, in both quark and lepton sectors. Promoting the spurions to be dynamical fields, the associated scalar potential is also studied and a minimum is identified such that fermion masses and mixings are correctly reproduced.
Keywords: BSM physics, bottom-up approach, flavour symmetry.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 129-135.
Charged Lepton Flavor Violation Experiments
James P. Miller E-mail: miller@bu.edu Department of Physics, Boston University, Boston, MA USA Received January 17, 2022
We briefly summarize the current status and plans of a sample of charged lepton flavor violation experimental efforts, emphasizing muon-based experiments.
Keywords: charged leptons flavor violation.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 136-149.
The Odderon Discovery by the D0 and TOTEM Collaborations
Christophe Royon E-mail: christophe.royon@cern.ch
University of Kansas, Lawrence, USA Received February 15, 2022
We describe the discovery of the odderon, by the D0 and TOTEM Collaborations by comparing elastic differential cross sections measured in pp and pp interactions at high energies.
Keywords: BSM physics, odderon, TOTEM.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 141-144.
