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Early LHC bound on W’ mass in nonuniversal gauge interaction model

Early LHC bound on W’ mass in nonuniversal gauge interaction model. Kang Young Lee Konkuk University Seoul, Korea. 핵입자워크샵 @ 양재교육문화회관 2011 . 12. 2. Based on Y. G. Kim, K. Y. Lee, Phys. Lett . B ? (2011) K. Y. Lee, Phys. Rev. D 82, 097701 (2010)

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Early LHC bound on W’ mass in nonuniversal gauge interaction model

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  1. Early LHC bound on W’ massin nonuniversal gauge interaction model Kang Young Lee Konkuk University Seoul, Korea 핵입자워크샵@ 양재교육문화회관 2011. 12. 2.

  2. Based on Y. G. Kim, K. Y. Lee, Phys. Lett. B ? (2011) K. Y. Lee, Phys. Rev. D 82, 097701 (2010) K. Y. Lee, Phys. Rev. D 76, 117702 (2007)

  3. Contents • Introduction • The Model • Indirect Constraints • Early LHC bounds on W’ • Summary • LEP electroweak precision test • Low-energy neutral currents experiments • CKM matrix unitarity • Lepton flavour violation

  4. LHC is Working Fine!

  5. 1.49fb-1 delivered by LHC and 1.38fb-1recorded by CMS

  6. Introduction • The LHC is running very successfully, data of ~ 5.6 fb-1. are collected in this year. Direct searches for new physics beyond the SM have started at the LHC. • Non-universal gauge interaction shows distinctive signals so very strong indirect bounds are obtained. • Early LHC data provides the direct bounds on the non-universal gauge model, which is already compatible to the indirect bounds. • Violation of the unitarity of the CKM matrix • FCNC at tree level

  7. pp → W’ → eν / μν Selection criteria ET > 30 GeV Isolation radius CMS collab., PLB 698, 20 (2011)

  8. CMS collab., arXiv:1103.0030 [hep-ex]

  9. Assuming standard-model-like couplings and decay branching fractions we exclude a SSM W’ with mass <2.27 TeV (CMS), <2.15 TeV (ATLAS) @95%CL. CMS-PAS-EXO-11-024.

  10. The Model • G = SU(2)l X SU(2)h X U(1)Y SU(2)L X U(1)Y U(1)EM Malkawi, Tait, Yuan, PLB 385, 304 (1996) Muller, Nandi, PLB 383, 345 (1996) Lee, Lee, Kim, PLB 424, 133 (1998) Batra, Delgado, Kaplan, Tait, JHEP 0402, 043 (2002) (SUSY) Lee, PRD 76, 117702 (2007) Chiang, Deshpande, He, Jiang, PRD 81, 015006 (2010)

  11. with The covariant derivative The gauge couplings are parameterized

  12. Spontaneous symmetry breaking by with parameterization Heavy gauge boson masses where

  13. LEP electroweak precision test - Corrections to Z → l-l+, Z → bb decays

  14. Low-energy neutral current experiments νN →νN scattering νe →νe scattering

  15. eN→eX scattering Atomic Parity Violation

  16. Data of low-energy neutral current interactions PDG 2010

  17. CKM matrix unitarity CKM matrix Unitarity relation : Beta decay : K decay : B decay : Unitarity holds.

  18. Non-universal terms in CC interactions separated: where with

  19. ‘Observed’ CKM matrix is defined by the effective Hamiltonian and obtained as (including modified W + W’ effects) Unitarity violating term Unitarity violated!

  20. Lepton Flavour Violation Non-universal terms in NC interactions separated: Universal terms where

  21. Non-universal terms where

  22. Diagonalization where FCNC arise!

  23. Lepton flavour violating processes PDG 2010

  24. Flavour diagonal corrections LEP EW working group

  25. LFV Z decays LFV τ decays LFV μ decay is given in the similar form.

  26. 1) |V32|, |V31|∼0 2) One of |V32|, |V31|∼1, the other ∼0 3) Either |V32| or |V31|∼ for unitarity. Corresponding LFV decay exceeds the experimental bound. In conclusion, only one and others are very small.

  27. Combine all parameters and indirect bounds.

  28. Search for W’ at the LHC W’ decay width for 1st, 2nd gen. for 3rd gen.

  29. CMS 36 pb-1 ATLAS 200 pb-1 ATLAS 1.04 fb-1 CMS 1.14 fb-1

  30. Bound from ATLAS 1.04 fb-1 data Bound from CMS 36pb-1 data Direct bounds are obtained and become better than indirect bounds.

  31. Summary • The LHC data begin testing the new physics beyond the SM directly. • Plenty of new physics results are being published. No evidence for BSM physics so far. • The non-universal SU(2)l X SU(2)h X U(1)Y model predicts many distinct features and has been constrained by various experiments. • Early LHC data provides direct bounds on this model which is already compatible to the indirect bounds.

  32. We are waiting for More Data, Better Results, New Discovery and hope that many people buy the book :

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