Journée de la saveur à IJCLab

Liste des Contributions

6. Towards a measurement of $R_{K^{\ast }}$ at high-$q^2$ (15'+3')

Dr Guillaume Pietrzyk (IJCLab)

02/06/2023 14:00

In December 2022, LHCb released a new test a lepton flavor universality through the simultaneous measurement of $R_K$ and $R_{K^{\ast }}$ in two intervals of the dilepton invariant mass: $q^2\in [0.1,1.1]{\text{GeV}}^2$ (low-$q^2$) and $q^2\in [1.1,6.0]{\text{GeV}}^2$ (central-$q^2$). This talk presents the analysis of a measurement of $R_{K^{\ast }}$ in a region of high values of $q^2$,...

2. On QED corrections to $\overline{B}\to \overline{K}{\ell }^{+}{\ell }^{-}$ and $R_K$: Theory vs Experiment (15'+3')

saad nabeebaccus (IJCLab)

02/06/2023 14:18

In my talk, I will present our recent work in 2205.08635. Starting from the QED result at 1 loop for $\overline{B}\to \overline{K}{\ell }^{+}{\ell }^{-}$ derived in our earlier work (2009.00929), we build a dedicated Monte Carlo, which we use to cross-check PHOTOS. Next, we investigate the effect of charmonium resonances (in particular the $J/\psi$ one) on the 1-6 GeV${}^2$ $q^2-$bin used to determine $R_K$....

9. Angular analysis of the Bs->Phiee decay in the very-low q${}^2$ bin to access photon polarization (10'+3')

Gaelle Khreich

02/06/2023 14:36

4. QCD effects in B decays (15'+3')

Méril Reboud (IPPP, Durham & IJClab, Orsay)

02/06/2023 14:50

Hadronic uncertainties are the main blockers for a full phenomenological use of experimental B decays analyses. I will show that global analyses of the b -> s transitions based on analyticity and unitarity give the proper framework to systematically reduce these uncertainties.

5. Angular analysis of the decay ${\mathrm{\Lambda }}_b^0\to \mathrm{\Lambda }{\ell }^{+}{\ell }^{-}$ at high $q^2$ with the LHCb experiment (10'+3')

Janina Nicolini (IJCLab / TU Dortmund)

02/06/2023 15:08

To improve the understanding of the differences observed in several different observables of mesonic $b\to s{\ell }^{+}{\ell }^{-}$ transitions, it is important to also study $b\to s{\ell }^{+}{\ell }^{-}$ transitions in baryon decays.
The decay ${\mathrm{\Lambda }}_b^0\to \mathrm{\Lambda }{\ell }^{+}{\ell }^{-}$ is particular interesting due to the fact that it is the most abundant produced weakly decaying b-baryon. Studying the angular...

3. Probing Lepton Flavor Violation in Meson Decays with LHC Data (10'+3')

Ioannis Plakias (IJCLab)

02/06/2023 15:21

In this letter, we use LHC data from the Drell-Yan processes $pp\to {\ell }_i{\ell }_j$ (with $i\ne j$) to derive model-independent upper limits on lepton-flavor-violating meson decays. Our analysis is based on an Effective Field Theory (EFT) approach and it does not require a specific assumption regarding the basis of effective operators. We find that current LHC data (140 ${\mathrm{fb}}^{-1}$)...

1. New physics search via CP observables in $B_s^0\to \varphi \varphi$ decays with left- and right-handed Chromomagnetic operators (10'+3')

Tejhas Kapoor (IJC Lab)

02/06/2023 15:35

In this work, we investigate the time-dependent angular analysis of $B_s^0\to \varphi \varphi$ decay to search for new physics signals via CP-violating observables. We work with a new physics Hamiltonian containing both left- and right-handed Chromomagnetic dipole operators. The hierarchy of the helicity amplitudes in this model gives us a new scheme of experimental search, which is...

7. New physics from oscillations at the DUNE near detector, and the role of systematic uncertainties (15'+3')

Salvador Rosauro

02/06/2023 16:25

We study the capabilities of the future DUNE experiment to probe several new physics scenarios, namely deviations from unitarity of the leptonic mixing matrix, searches for light sterile states and NSI's. We study in detail the impact of several systematic uncertainties to the near detector sensitivity to new physics.

8. Closing talk, "Radiative leptonic decays of pseudoscalar mesons from lattice QCD"

Dr Giuseppe Gagliardi

02/06/2023 16:43