Flavour Physics; Particle Physics; CP violation; Rare B decays; LHC; LHCb
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Aaij R., Abellán Beteta C., Adeva B., Adinolfi M., Aidala C. A., Ajaltouni Z., Akar S., Albicocco P., Albrecht J., Alessio F., Alexander M., Alfonso Albero A., Alkhazov G., Alvarez Cartelle P., Alves A. A., Amato S., Amhis Y., An L., Anderlini L., Andreassi G., Andreotti M., Andrews J. E., Archilli F., Arnau Romeu J., et al. (2019), Measurement of CP violation in the Bs → ϕϕ decay and search for the B0 → ϕϕ decay, in Journal of High Energy Physics
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Aaij R., Abellán Beteta C., Adeva B., Adinolfi M., Aidala C. A., Ajaltouni Z., Akar S., Albicocco P., Albrecht J., Alessio F., Alexander M., Alfonso Albero A., Alkhazov G., Alvarez Cartelle P., Alves A. A., Amato S., Amerio S., Amhis Y., An L., Anderlini L., Andreassi G., Andreotti M., Andrews J. E., Archilli F., et al. (2019), Amplitude analysis of B s 0 → K S 0 K±π∓ decays, in Journal of High Energy Physics
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Mauri Andrea, Serra Nicola, Silva Coutinho Rafael (2019), Towards establishing lepton flavor universality violation in B→K*ℓ+ℓ− decays, in Physical Review D
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ChrzaszczMarcin, MauriAndrea, SerraNicola, Silva CoutinhoRafael, van DykDanny (2019), Prospects for disentangling long- and short-distance effects in the decays B→K*μμ, in JHEP
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Back John, Gershon Tim, Harrison Paul, Latham Thomas, O’Hanlon Daniel, Qian Wenbin, del Amo Sanchez Pablo, Craik Daniel, Ilic Jelena, Otalora Goicochea Juan Martin, Puccio Eugenia, Silva Coutinho Rafael, Whitehead Mark (2018), Laura ++ : A Dalitz plot fitter, in Computer Physics Communications
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Aaij R., Adeva B., Adinolfi M., Ajaltouni Z., Akar S., Albrecht J., Alessio F., Alexander M., Alfonso Albero A., Ali S., Alkhazov G., Alvarez Cartelle P., Alves A. A., Amato S., Amerio S., Amhis Y., An L., Anderlini L., Andreassi G., Andreotti M., Andrews J. E., Appleby R. B., Archilli F., d’Argent P., et al. (2018), Amplitude Analysis of the Decay B0 → KS0π+π− and First Observation of the CP Asymmetry in B0→K*(892)−π+, in Physical Review Letters
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Aaij R., Adeva B., Adinolfi M., Ajaltouni Z., Akar S., Albrecht J., Alessio F., Alexander M., Ali S., Alkhazov G., Alvarez Cartelle P., Alves A. A., Amato S., Amerio S., Amhis Y., An L., Anderlini L., Andreassi G., Andreotti M., Andrews J. E., Appleby R. B., Archilli F., d’Argent P., Arnau Romeu J., et al. (2017), Updated branching fraction measurements of B(s)0 → KS0h+h′− decays, in Journal of High Energy Physics
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The discovery of the long-awaited Higgs boson at the Large Hadron Collider (LHC) confirms the remarkable success of the Standard Model (SM) of particle physics. While in the last decades high-energy experiments have verified to an impressive level of accuracy the predictions of the SM, the theory is not complete, and it does not provide explanations for dark matter, neutrino oscillation or the baryogenesis. A number of extensions of the SM have been proposed (e.g. the existence of new massive particles), and direct searches for New Physics (NP) effects are currently the dominant experimental effort of the particle physics community. Since not clear sign of NP has been seen, indirect searches, which are highly sensitive to new particles effects at higher scales and new couplings, are becoming of crucial importance. In particular, stringent constraints in the phase space of NP contributions have been placed in a series of important observables. A prime example is the heavy flavour physics programme that studies interactions that differ among flavours, mainly in decays involving c and b quarks. This term has been firstly introduced by Murray Gell-Mann and his student, when noting that "just as ice-cream has both colour and flavour so do quarks" (and leptons). In the SM, flavour-physics refers to the weak and Yukawa interactions, and NP could introduce additional flavoured interactions. There are two main motivations for ongoing experimental investigations into this field: search for rare or SM forbidden processes beyond the current energy frontier; and CP violation and its connection to the matter-antimatter asymmetry of the Universe. My proposed project aims to improve the understanding of rare semileptonic and hadronic b-hadron decays, by addressing both of the aforementioned key measurements: flavour anomalies in b -> s l+ l- transitions that could be a genuine sign of NP and CP violation in b baryons. Recent studies of rare semileptonic decays of beauty mesons, mediated through virtual quantum loops, reported some intriguing discrepancies with the SM predictions, which seems to form a coherent pattern. In particular, in the angular observables P'5 of the B0 -> K*0 mu+ mu- decay and the suppression of the muon channel in the ratio of branching fractions of B+ -> K+ mu+ mu- to B+ -> K+ e+ e- transitions. In order to achieve a conclusive understanding of these anomalies, a close collaboration between theory and experiment, with novel approaches that include all of the information that is relevant for the theory calculations is paramount. The proposed research will, for the first time, disentangle hadronic long-distance effects from NP contributions, that currently limit the unambiguous claim of existence of physics beyond the SM. In addition, the nature of the flavour anomalies, mainly its connection with the hypothesis that particles couple unequally to different flavours of leptons, will be finally completely elucidated. Searches for CP violation in decays of beauty baryons to purely hadronic final states became experimentally accessible only recently with the start of LHCb. First asymmetry measurements in multi-body charmless decays have been carried out by me and no significant CP violation has been observed. More recently, a first evidence of this phenomena in Lb -> p pi- pi+ pi- has been reported by LHCb. This has an extraordinary impact to the field and further measurements with other multi-body beauty baryon decays are compulsory to confirm such observation. In this project, the golden channel Lb -> p K*- is studied in a Dalitz-plot analysis of the decay Lb -> K0 p pi-. This has a great potential to make the first observation of CP violation in b baryons and also provide deeper insights on the dynamics of these processes. Ultimately, I expect with this research to either find evidence for new phenomena in quark flavour physics, or to place stringent bounds on the size of any NP effects, using the unprecedented LHCb dataset available in Run-I and II. Regardless of the outcome, my results will yield insight as to how NP behaves, and could therefore revolutionise our understanding of physics interaction at the smallest distances.