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b s b c anomalies anomalies Found by LHCb (and perhaps Found by - PowerPoint PPT Presentation

Oct 25, 2023 •141 likes •342 views

b s b c anomalies anomalies Found by LHCb (and perhaps Found by several experiments hinted by Belle) (LHCb, BaBar and Belle) Many observables: global pattern Two observables: R(D) and R(D*) Neutral current Charged current 1-loop

  1. b → s b → c anomalies anomalies Found by LHCb (and perhaps Found by several experiments hinted by Belle) (LHCb, BaBar and Belle) Many observables: global pattern Two observables: R(D) and R(D*) Neutral current Charged current 1-loop (and CKM-suppressed) Tree-level in the SM in the SM The New Physics can be heavy The New Physics must be light

  2. The anomalies

  3. The anomalies [LHCb, 2014] Episode V: LHCb strikes back arXiv:1406.6482 2014 : Lepton universality violation IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 3

  4. The anomalies LHCb measurement SM prediction 2.6 s 2.2 s 2.4 s Important: LFUV ratios are clean observables, free from hadronic uncertainties If confirmed: dramatic implications for New Physics Run-2 update eagerly awaited IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 4

  5. The anomalies

  6. The anomalies BaBar + Belle + LHCb Another hint of lepton universality violation? Deviation from the SM at the 4 s level IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 6

  7. The anomalies IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 7

  8. New Physics explanations

  9. New Physics explanations Neutral current Z’ boson, leptoquarks, compositeness, RPV loops Charged current Charged Higgs, leptoquarks, compositeness, W’ boson, RPV sfermions IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 9

  10. Leptoquarks Simultaneous explanation of both puzzles: leptoquarks? Alonso, Grinstein, Martin-Camalich [1505.05164] Example: Barbieri, Isidori, Pattori, Senia [1512.01560] ... and others Other leptoquarks have also been proposed However: leptoquarks added to the models without a clear theoretical motivation... ad-hoc IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 10

  11. Backup slides

  12. The anomalies 2013 - Episode IV: A new hope 2014 - Episode V: LHCb strikes back 2015 - Episode VI: Return of the anomalies 2016 - Episode I: The Belle menace 2017 - Episode II: Attack of R K * 2018 - Episode III: ??? IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 12

  13. The anomalies [LHCb, 2013] Episode IV: A new hope 1305.2168, 1308.1707, 1403.8044 2013 : First anomalies found by LHCb ● Data collected: ● Decrease (w.r.t. the SM) in several branching ratios arXiv:1308.1707 ● Several anomalies in angular observables IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 13

  14. The anomalies differential angular distribution Optimized observables [Descotes-Genon et al, 2012, 2013] [Figure borrowed from Javier Virto] IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 14

  15. The anomalies [LHCb, 2015] Episode VI: Return of the anomalies 1512.04442 2015 : LHCb confirms first anomalies [ Complete LHC Run I dataset ] Errors shrunk... ... anomalies persist IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 15

  16. The anomalies [Belle, 2016] 1612.05014 Episode I: The Belle menace 2016 : Belle finds additional hints P 5 ’ anomaly confirmed Little LFVU indication IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 16

  17. The anomalies [LHCb, 2017] Talk by S. Bifani Episode II: Attack of R K * April 18th 1705.05802 2017 : More universality violation in LHCb low central bin bin IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 17

  18. Interpreting the anomalies Effective hamiltonian : Wilson coefficients : Operators [ analogous for primed operators ] IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 18

  19. Global fits Table from Capdevila et al, 1704.05340 All observables Only LFUV observables “clean” + “dirty” “clean” New Physics hypothesis preferred over SM by more than 5 s (4 s if only LFUV) The C 9 m coefficient seems to be crucial Qualitatively similar results in 1704.05435 and 1704.05438 IFIC, 20/09/17 Avelino Vicente - BSM Journal Club 19

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