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DTSTART;TZID=Europe/Rome:20230412T140000
DTEND;TZID=Europe/Rome:20230414T183000
DTSTAMP:20260515T063922
CREATED:20230207T142918Z
LAST-MODIFIED:20230406T122852Z
UID:34421-1681308000-1681497000@w3.lnf.infn.it
SUMMARY:Open LHCb Workshop on semileptonic exclusive $b\rightarrow c$ decays
DESCRIPTION:The semileptonic decays of heavy hadrons are a rich source of observables sensitive to SM and NP paramaters. Despite the efforts from both experimental and theoretical sides\, the measurements of the CKM parameter $|V_{cb}|$ from inclusive and exclsuive decays\, remain in significant tension. Moreover\, the measurements of the ratios $R=BF(B\rightarrow D^{(*)}\tau\nu_{\tau})/ BF(B\rightarrow D^{(*)}\ell\nu_{\ell})$ have gained in the last decade a lot of interests because of the intriguing discrepancies with their precise SM expectations. Even if the tension with the SM seems reduced with the accumulation of more measurements\, more precise measurements and solid SM predictions would be welcome. If confirmed\, the discrepancy would be a clear sign of violation of Lepton Universality (LU).The main goal of the workshop is to enlarge the potential of these measurements at LHCb\, with a critical comparison with the results from B-Factories and prospects from Belle II.  The measurements of $|V_{cb}|$ and the predictions of the ratios R from exclusive $b\to c$ decays\, require crucial input from non perturbative calculations of the Form Factors. New observables\, accessibile from detailed studies of final state angular distributions\, are very sensitive to NP models and can also constrain the shape of the Form Factors.Another topic that will be discussed is related to common systematic uncertainties that affect measurements both at LHCb and B-Factories. For example the production of excited charm-hadrons in semileptonic decays\, that is a source of physical background. Moreover there are common tools that could be shared between the various experiments to speed up the analysis process and for better understanding of common systematics.Finally\, these analyses require improvements  in external inputs from both theory and experiment. Some of these inputs would need dedicated measurements from other facilities\, as BESIII. A coordination accross experiments would be beneficial for many analyses.All of this will be discussed during the first two days of the workshop between the LHCb community\, the theorists of flavour physics and the experimentalists from other heavy flavour facilities. Friday morning will be dedicated to internal discussions of the LHCb collaboration.The Workshop will be held in the “Bruno Touschek” Auditorium (Bldg. 36). Participants will access from the LNF secondary entrance in Via E. Fermi\, 60 (see map).
URL:/event/open-lhcb-workshop-on-semileptonic-exclusive-brightarrow-c-decays/
LOCATION:Auditorium B. Touschek\, Via Enrico Fermi\, 54\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Conferenze & Workshops
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DTSTART;TZID=Europe/Rome:20230412T143000
DTEND;TZID=Europe/Rome:20230412T163000
DTSTAMP:20260515T063922
CREATED:20230227T141634Z
LAST-MODIFIED:20230418T132939Z
UID:34671-1681309800-1681317000@w3.lnf.infn.it
SUMMARY:The Flavor Puzzle as a Hint for Light New Physics in the Third Family
DESCRIPTION:Several observational facts lead us to expect that the Standard Model (SM) should be extended by new physics (NP) at short distances\, but where should we look? We can find clues from several structural puzzles that exist within the SM. One of the few that hints at a low NP scale is the instability of the Higgs mass in the presence of quantum corrections. Another long-standing puzzle is the origin of flavor\, or the fact that SM fermions come in three copies. These copies would be physically indistinguishable were it not for the fact that they couple with very different strengths to the Higgs field\, hinting at a possible connection between the SM flavor puzzle and the electroweak (EW) hierarchy problem. Another powerful hint comes from flavor symmetries accidentally respected by the SM. Experimental tests of these accidental symmetries constitute powerful probes of new high-energy dynamics\, with current flavor bounds pushing the scale of flavor anarchic NP to the PeV ballpark. This is in apparent contradiction with a natural Higgs mass\, which calls for NP not far above the TeV scale. It is therefore plausible to expect that the NP sector responsible for solving the EW hierarchy problem has a very specific flavor structure\, again hinting at a possible connection to the SM flavor puzzle. In particular\, this would imply new particles around the TeV scale that can distinguish between flavors\, just as the Higgs can. One well-motivated expectation in light of these arguments is TeV scale NP dominantly coupled to the third family\, while the couplings to light fermions have a SM Yukawa-like suppression. Under such a hypothesis\, the largest NP effects are expected in purely third-family or 3->2 processes. Following this logic\, I outline the most promising semi-leptonic channels for flavor factories and emphasize the connection with other low-energy observables\, as well as with high-pT searches at the LHC. Finally\, I discuss a concrete model where hints of LFU violation observed in semi-leptonic b->c decays can be explained due to the presence of a TeV scale vector leptoquark with a coupling structure reminiscent of the SM Yukawas.    
URL:/event/the-flavor-puzzle-as-a-hint-for-light-new-physics-in-the-third-family/
LOCATION:Auditorium B. Touschek\, Via Enrico Fermi\, 54\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Seminari generali
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