FLASY 2022 - 9th Workshop on Flavour Symmetries and Consequences in Accelerators and Cosmology

Session

Afternoon Session

27 Jun 2022, 14:30

IST Congress Centre (Instituto Superior Técnico, Lisbon, Portugal)

Conveners

Afternoon Session

• Marc Sher

Afternoon Session

• Mariam Tórtola

Afternoon Session

• Blazenka Melic

Afternoon Session

• Svjetlana Fajfer

Afternoon Session

• Jose Valle

57. Revisiting puzzles in lifetimes of single charmed hadrons

Blaženka Melić (Rudjer Boskovic Institute)

27/06/2022, 14:30

We provide an extensive study of the lifetimes of singly charmed baryons and
mesons, within the heavy quark expansion with all known corrections included.
We give our predictions for lifetimes, lifetime ratios, and semileptonic branching ratios of singly charmed baryons. Our results accommodate the experimentally-favoured hierarchy of singly charmed baryon lifetimes
τ (Ξ0c)< τ (Λ+c) < τ...

52. Heavy neutral leptons as long-lived particles

Martin Hirsch

27/06/2022, 15:00

Interest in searches for heavy neutral leptons (HNLs) has gained significant momentum over the past few years with the appearance of several proposals for new dedicated "far" detectors to search for long-lived particles at the LHC. In this talk, I will briefly discuss HNLs and their possible connection with neutrino masses. I will then introduce NRSMEFT, i.e. standard model effective theory...

65. B0 B0\bar entanglement for an ideal experiment on the direct CP violation gamma phase

Francisco J. Botella (Univ. of Valencia and CSIC (ES))

27/06/2022, 15:30

B0 B0\bar entanglement offers a conceptual alternative to the single charged B-decay asymmetry for the measurement of the direct CP violating
gamma phase. With f =J/PsiK_L; J/PsiK_S and g =(PiPi)0; (Rho_LRho_L)0 the 16 time-ordered double decay rate Intensities to (f; g) depend on the relative phase between the the f- and g-decay amplitudes given by gamma at tree-level. Several constraining...

53. Elusive signals with anomaly detection

Juan Antonio Aguilar Saavedra (Consejo Superior de Investigaciones Cientificas (CSIC) (ES))

27/06/2022, 16:30

Elusive signals of new particles may well be hidden in LHC data. Because the mass of the new particles is unknown, as well as the specific characteristics of the signals, anomaly detection methods are quite valuable to bring these signals to light.

64. Status of the R(D(*)) anomaly and complementary LHC probes

Monika Blanke (Karlsruhe Institute of Technology)

27/06/2022, 17:00

I will briefly review the current status of the anomaly in the lepton flavour universality ratios R(D(*)). Subsequently I will discuss ooportunities to probe the underlying New Physics with targeted LHC searches.

87. On the interplay between flavour anomalies and neutrino properties

António Morais (University of Aveiro)

27/06/2022, 17:30

A minimal extension of the Standard Model (SM) featuring two scalar leptoquarks, an SU(2) doublet with hypercharge 1/6 and a singlet with hypercharge 1/3, is proposed as an economical benchmark model for studies of an interplay between flavour physics anomalies and properties of the neutrino sector. The presence of such type of leptoquarks radiatively generates neutrino masses and offers a...

83. (g-2) and lepton flavor violation in low scale flavor symmetries

Oscar Manuel Vives Garcia (Univ. of Valencia and CSIC (ES))

27/06/2022, 18:00

Low-energy flavour symmetries could contribute to the observed muon anomalous magnetic moment discrepancy. However, the stringent experimental bound on $\mu \to e\gamma$ is compatible with a simultaneous and sizable new physics contribution to the muon only if we assume a mostly (quasi)diagonal texture for models with a low flavor breaking scale. We propose a mechanism in which the realization...

69. Questioning New Physics in Rare Semileptonic B, D, and K decays

Svjetlana Fajfer

28/06/2022, 14:30

We investigate the consequences of deviations from the Standard Model observed in b→sμμ transitions for flavour-changing neutral-current processes involving down-type quarks and neutrinos. We derive the relevant Wilson coefficients within an effective field theory approach respecting the SM gauge symmetry, including right-handed currents, a flavour structure based on approximate U(2) symmetry,...

76. Semi-dark Higgs decays: sweeping the Higgs neutrino floor

Jose Miguel No (IFT-UAM/CSIC)

28/06/2022, 15:00

We study exotic Higgs decays $h \to Z X$, with $X$ an invisible BSM particle, resulting in a semi-dark final state. Such exotic Higgs decays may occur in theories of axion-like-particles (ALPs), dark photons or pseudoscalar mediators between the SM and dark matter. The SM process $h\to Z\nu\bar{\nu}$ represents an irreducible ``Higgs neutrino floor'' background to these new physics searches,...

90. Two component dark matter models: combined particle physics and cosmological approach

Myriam Mondragón

28/06/2022, 15:30

We explore the possibility of incorporating particle physics motivated scalar fields to the dark matter cosmological model. We consider two scalar fields, one that does not interact in any way, except via the gravitational interaction, with the rest of the matter in the Universe (which we denote as classical). The second scalar is a BSM field, which can be either a Higgs-like or an axion-like...

59. Beyond Jarlskog: Playing with Flavor Invariants

Christophe Grojean (DESY (Hamburg) and Humboldt University (Berlin))

30/06/2022, 14:30

The talk will be about CP violation but also about axion shift-invariance breaking. In both cases, Jarlskog-like flavour invariants capture collective breaking effects and allow one to define parameters orders that measure the amount of symmetry breaking and that could be used to define a self-consistent power counting closed under the renormalisation group evolution.

51. New Physics in Yukawa Couplings with Flavour Symmetries

Luca Merlo (Universidad Autonoma de Madrid)

30/06/2022, 15:00

Colliders and flavour facilities provide complementary information on fermion-Higgs couplings. Within the SMEFT approach, bounds on the new physics scale affecting the Yukawa couplings are obtained assuming the presence of a flavour symmetry. Limits on the diagonal couplings arise from Higgs boson production and decays at the LHC experiments, while bounds on non-diagonal couplings from a...

55. Flavour symmetries in the SMEFT

Ilaria Brivio (University of Heidelberg)

30/06/2022, 15:30

The talk will discuss the role of flavor symmetries in defining the structure of the Standard Model Effective Field Theory and it will give an overview of their implications for searches of indirect new physics signals at the LHC.

40. Universal inverse seesaw and radiative neutrino masses

Antonio Enrique Cárcamo Hernández

01/07/2022, 14:30

In this talk I will describe a theory where the Inverse seesaw mechanism is implemented not only in the neutrino sector but also in the SM charged fermion sector in order to explain the pattern of SM fermion masses. To the best of my knowledge, that model corresponds to the first implementation of the inverse seesaw mechanism for the charged fermion sector. I will discuss its implications in...

62. Kaon and B-meson decays with neutrino pairs

German Valencia (Monash University (AU))

01/07/2022, 15:00

We discuss rare kaon and B meson decays with final state neutrino pairs in the context of non-standard neutrino interactions that add incoherently to standard model rates. We use existing experimental limits to constrain neutrino lepton flavour violation, neutrino lepton number violation, and additional light neutrino species contributions to these modes.

68. Exotic Higgs Bosons at LHC

Gautam Bhattacharyya

In this talk I shall discuss how to dig out neutral exotic Higgs states, having unconventional couplings with ordinary matter and gauge fields, from the LHC data. Their exotic behavior can be justified by flavor models, though our approach is to remain as model independent as possible.