1 / 39

Data Dr I ven Flavour Model

TAE 2019 - COST Training School on High Energy Physics. Data Dr I ven Flavour Model. Author : Carlos Bouthelier Madre Director: Dr. Luca Merlo. May 7, 2019. Index. The Flavour Puzzle , BSM Flavour Problem and objectives . Minimal Flavour Violation . U(2) models .

dstone
Download Presentation

Data Dr I ven Flavour Model

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. TAE 2019 - COST Training School on High Energy Physics Data DrIvenFlavourModel Author: Carlos Bouthelier Madre Director: Dr. Luca Merlo May 7, 2019

  2. Index • TheFlavourPuzzle, BSM FlavourProblem and objectives. • MinimalFlavourViolation. • U(2) models. • Data DrivenFlavourModel. • B anomalies. • Comparison, conclusionand foresights.

  3. FlavourPuzzle, BSMFP and objectives. TheFlavourPuzzle BSM FP Objectives • Experimental problems: Prediction vs measurements • Theoreticalproblems: Naturalnessprinciple • Masshierarchiesforfermionsand not-order-oneYukawas. • Mixings in quark and lepton sector.

  4. FlavourPuzzle, BSMFP and objectives. TheFlavourPuzzleBSM FP Objectives TheFlavourPuzzle BSM FP Objectives TheFlavourPuzzleObjectives • Masshierarchyforfermions. Expectedto be order 1 Yukawa Parameters or

  5. FlavourPuzzle, BSMFP and objectives. TheFlavourPuzzle BSM FP Objectives TheFlavourPuzzle BSM FP Objectives TheFlavourPuzzleObjectives • Masshierarchyforfermions. Yukawa Parameters are expectedto be order 1 or

  6. FlavourPuzzle, BSMFP and objectives. TheFlavourPuzzle BSM FP Objectives TheFlavourPuzzle BSM FP Objectives TheFlavourPuzzleObjectives • Hierarchical vs democraticmixings.

  7. FlavourPuzzle, BSMFP and objectives. TheFlavourPuzzleBSM FPObjectives BSM FlavourProblem. Objectives • Modelbuilding & Beyond Standard ModelFlavourProblem. • B-Anomalies. Statisticaldeviations of SM predictionfrommeasurementson B mesonsemileptonicdecays. New FlavourPhysics (NR) Experimental evidence New model (Eff. Th.) yields Must be compatible Scale of NP Suppresses Validuntil Withoutpushingtoohigh

  8. FlavourPuzzle, BSMFP and objectives. TheFlavourPuzzle BSM FPObjectives • Global, continuous, non-abbelianflavoursymmetryspontaneouslybrokenbyspurions, followingtheMinimumFlavourViolationprinciple. • Review top-downmodels: and . • Propose a new bottom-up model, studyitsphenomenology (BSM FP) and compare withpreviousmodels. • Describingthe B anomaliesundersuchflavoursymmetrywiththreeleptoquarkcandidates as mediators.

  9. MinimalFlavourViolation SymmetrybreakingpatternPhenomenology • Minimal FlavourViolationPrinciple.

  10. MinimalFlavourViolation Symmetrybreakingpattern. Phenomenology SymmetrybreakingpatternPhenomenology • Minimal FlavourViolationPrinciple. • Biggestsymmetryallowedbykineticterms:

  11. MinimalFlavourViolation Symmetrybreakingpattern. Phenomenology SymmetrybreakingpatternPhenomenology • Minimal FlavourViolationPrinciple. • Biggestsymmetry: • Quark sector: Spurionsand theirBVs SSB

  12. MinimalFlavourViolation Symmetrybreakingpattern. Phenomenology SymmetrybreakingpatternPhenomenology • Minimal FlavourViolationPrinciple. • Biggestsymmetry: • Quark sector: • Whyis Yukawa top higher? 2HDM or fine tuning! Spurionsand theirBVs SSB

  13. MinimalFlavourViolation Symmetrybreakingpattern. Phenomenology SymmetrybreakingpatternPhenomenology • Lepton sector. • Minimal Field Content Extended Field Content

  14. MinimalFlavourViolation Symmetrybreakingpattern. Phenomenology SymmetrybreakingpatternPhenomenology • Lepton sector • Minimal Field Content Extended Field Content

  15. MinimalFlavourViolation Symmetrybreakingpattern. Phenomenology SymmetrybreakingpatternPhenomenology • Lepton sector • Minimal Field Content Extended Field Content Violates MFV principle Expandingparameter Predictivity

  16. MinimalFlavourViolation SymmetrybreakingpatternPhenomenology • Quark sector. Dimensionsixoperatorsbuilt of bilinears:

  17. MinimalFlavourViolation SymmetrybreakingpatternPhenomenology • Quark sector. Dimensionsixoperatorsbuilt of bilinears:

  18. MinimalFlavourViolation SymmetrybreakingpatternPhenomenology • Quark sector. d=6 operatorsbuilt of FlavourInvariantbilinears: • Flavour Factor

  19. U(2) Symmetrybreakingpattern. Phenomenology • Considers MFV symmetryisalreadybrokenbythirdgeneration. • Quark sector

  20. U(2) Symmetrybreakingpattern. Phenomenology • Considers MFV symmetryisalreadybrokenbythirdgeneration. • Quark sector

  21. U(2) Symmetrybreakingpattern. Phenomenology • Considers MFV symmetryisalreadybrokenbythirdgeneration. • Quark sector • Needs 2HDM

  22. U(2) Symmetrybreakingpattern. Phenomenology • Lepton sector.

  23. U(2) Symmetrybreakingpattern. Phenomenology • Lepton sector. . Complex SB without top-downjustification.

  24. U(2) Symmetrybreakingpattern. Phenomenology • Lepton sector. . Complex SB without top-downjustification. • Notminimalscenario,

  25. U(2) Symmetrybreakingpattern. Phenomenology • Lepton sector. . Complex SB without top-downjustification. • Notminimalscenario: a lot of spurions. • Pseudodegenerate neutrino massspectrum.

  26. U(2) Symmetrybreakingpattern. Phenomenology • Phenomenology of B and K mesons similar to MFV with 2HDM. • Unableto cope withallflavour data with SM content. • SUSY istheonlywaytoachievecompatibility! • However, SUSY’s 2HDM doesnotallow

  27. Data DrivenFlavourModel Symmetrybreakingpattern. Phenomenology • Bottom-up approachlookingfor a minimalscenario. • Order 1 for top yukawacoupling. • Hierarchicalmassstructureforallfermionsbutfor neutrinos. • sds • Hierarchicalmixing in quark sector, democratic in lepton sector.

  28. Data DrivenFlavourModel Symmetrybreakingpattern. Phenomenology

  29. Data DrivenFlavourModel Symmetrybreakingpattern. Phenomenology Quark sector • Yukawa termforthe top quark isflavourinvariant w/o spurions. • 3 spurionsfortherest of the quark sector masses and mixing. • Up-massbasis:

  30. Data DrivenFlavourModel Symmetrybreakingpattern. Phenomenology Lepton sector • 2 spurionsforthechargedlepton sector masses. • Diagonal form in massbasis: • Neutrino sector isexactly as in MFV. • Otherchoice of basiswould lead topredictivityissues (not MFV).

  31. Data DrivenFlavourModel SymmetrybreakingpatternPhenomenology • FCNC for LH down quarks withoutspurions, lesssuppressed, yieldsthesamephenomenology as MFV, and therefore • Verysuppressedflavourchangingphenomenology (duetospurioninsertions) for RH down quarks and LH or RH up quarks. Thisis a prediction of themodelthatcould be usefulforitsdistinction in dedicatedexperiments. • Leptonphenomenologyis as in MFV.

  32. B anomalies. Theanomalies. LQ interactions Global fit

  33. B anomalies. Theanomalies. LQ interactions Global fit • Threecandidates • Flavourinvariantinteractions, suppressedbyspurions.

  34. B anomalies. Theanomalies. LQ interactions Global fit • rules outthelasttwo LQ candidates.

  35. B anomalies. Theanomalies. LQ interactions Global fit • SM and LQ contributions. • SM and LQ contributions

  36. B anomalies. Theanomalies. LQ interactionsGlobal fit • Some of thestrongestconstraintsarisefrom box diagrams: MLQ>200MeV

  37. B anomalies. Theanomalies. LQ interactionsGlobal fit • Strongdependenceon neutrino masses, ordering and scale of LNV. • RD cannot be describedcoherentlywithotherphenomena, itneedsverysmall LQ masses(MLQ<2 GeV). • RK isproperlydescribedwithin a widephasespace 6GeV<MLQ<250 GeV • , and can be describedcoherentlywith RK within a relativelywidephasespace. • Succesfully copes withotherflavourconstraints and LHC constraintsonthemass of LQ duetothelowscale of thespurions.

  38. Conclusion • The Data DrivenFlavourModelsuccessfully describes theFlavourPuzzle and copes withthe BSM FlavourProblemwiththesamescale of New Physics as MinimalFlavourViolation. • Itpresentsuniquephenomenologicalfeatures, such as verysuppressed FCNC for up quarks and RH down quarks thatwouldallowto test it in futurededicatedexperiments. • Itsbuillt in a minimalway, withonlyoneHiggs and withoutthe non-minimalsymmetrybreakingpattern of adding a U(1). • Togetherwith a vector singletLeptoquark can describe neutral B anomalies, with a massforsuchleptoquarks of a fewGeVs. Italso copes withtheanomaly (g-2) of the muon and decays of chargedleptonsintothreechargedleptonswithin a widephasespace.

  39. Foresights • Themodel, despitebeing a promisingdescriptionof theFlavourPuzzle, lacksanultravioletcompletionto be regarded as anexplanation. Howeveritisnotcompletelyad hoc: SU(5) GUT inspired. • Itisnotexplainedwherethebackgroundvalues of thespurionsarisefrom, theconstruction of a potentialabletogivesuchminimaisnecessary. • A lot of variations of themodelcould be considered, such as gaugingthesymmetrygroup, consideringtheadition of abeliansymmetriestothepicture, promotingthespurionstodynamicalfields (and theirBackgroundvaluestoVEVs), etc.

More Related