TestingA Realistic Seesaw Model at LHC 郑亚娟 山东大学 第四届TeV物理工作组会议 25-27 Aug. 2009, Tianjin In Collaboration with W Chao, Z Si, Z Xing &S Zhou
Testing Realistic Seesaw Model at LHC 郑亚娟 山东大学 In Collaboration with W.Chao, Z. Si, Z. Xing & S. Zhou 第四届TeV物理工作组会议 25-27 Aug. 2009, Tianjin
Outline 冷 Motivation Mini-review: Seesaw mechanisms Realistic type-(I+Ir) Seesaw model Collider signatures o Summary
Outline ❖ Motivation ❖ Mini-review: Seesaw mechanisms ❖ Realistic type-(I+II) Seesaw model ❖ Collider signatures ❖ Summary
Motivation 冷 LHC era is coming Search for Higgs Test SM as precisely as possible Search for new physics beyond SM 1 t hint to bsM m,≠0 Tiny neutrino mass m, -10- Gel Large hierarchy problem m, /m, -10 &s Neutrino mass generation Seesaw mechanisms Radiative generation oo Question: How to connect this topic with LHC experiments
Motivation ❖ LHC era is coming … Search for Higgs Test SM as precisely as possible Search for New Physics beyond SM ❖ 1 st hint to BSM Tiny neutrino mass Large hierarchy problem ❖ Neutrino mass generation : Seesaw mechanisms Radiative generation ❖ Question: How to connect this topic with LHC experiments ? 10 m GeV 10− m 0 12 / 10 m m t −
Seesaw Mechanisms ype-I: (SM +3 R Majorana neutrinos N,) H0■ Clepton-LYHER+LYHNR+SNRMRNR+hc MMM .s Type-II: (SM +1 Higgs triplet A) k M,≈入Ⅰ M Lepton=HER+Y△4102-入△M△Hi024H+hc M=Y
❖ Type-I : (SM +3 RH Majorana neutrinos ) ❖ Type-II : (SM +1 Higgs triplet ) Seesaw Mechanisms 1 T M M M M D R D − − NR M Y v =
oo Type-III:(SM+3 fermion triplet 2) HOI Yr Lepton=IYHER+LV2Y22H+Ir(EMg2o)+hc.M&=MAI ss Hybrid seesaWs: type-(I+If), type-(I+III
❖ Type-III: (SM +3 fermion triplet ) ❖ Hybrid seesaws: type-(I+II), type-(I+III) … 1 T M M M M D T D − −
Type-(I+Ir) Seesaw SM+2 right-handed Majorana neutrinos NR+ 1 Higgs triplet A Clon=l yeh+lr Nrh epton +NRMRNR+ △iσ,G+hc SSB Cm=可ME +h Mr M R R Diagnolization R/ML M V R 0 S U/(M6 M 0 A Seesaw formula M=M-MMM L
SM + 2 right-handed Majorana neutrinos + 1 Higgs triplet Type-(I+II) Seesaw 1 T M M M M M L D R D − = − NR SSB Diagnolization Seesaw formula
Neutrino Mixing After iT/6 Tri-bimaximal diagnolization mixing pattern Harrison et al, 02: Z.Z. Xing, 0 Parameterization V= AV X G. He &A Zee, 03 12-13 13 S12C23-c1231323c12C23-s12S13S2 A=1 s2,0+O(s S12S23-C12513C23-c12823-S12813C23C13C23 3×3 unitary matri×)z.zxng,08 Nearly identity matri with Ci,= coS B, Si= sin i and si=e us, R=0+
Neutrino Mixing After diagnolization Tri-bimaximal mixing pattern Parameterization with 3×3 unitary matrix Nearly identity matrix Harrison et al, 02; Z. Z. Xing, 02; X. G. He & A. Zee, 03 Z. Z.Xing, 08
Conventional: DRD MEMMMNM IL M10 Gev Testable M>M W.Chao,Z.. Si, ZZXing, S Zhou 08 v W Chao, S Luo, Z. Z. Xing, S. Zhou 07 MMM<<MM MMM≈0如 Flavor symmetry A1×Z2 X G. He YY Keum &R.R. volkas 06 a triplet Higgs observable b Heavy Majorana neutrinos testable C Neutrinos masses stable
16 ~ 10 M GeV R 1 ~ T M M M M M D R D L − 1 ~ T M M M M M L D R D − 1 ~ ~ T M M M M M L D R D − 1 ~ T M M M M M L D R D − W. Chao, Z. G. Si, Z. Z.Xing, S. Zhou 08; W. Chao, S. Luo, Z. Z. Xing, S. Zhou 07 Pilaftsis, 92；Kersten et al, 07 Conventional: Testable: a. Triplet Higgs observable b. Heavy Majorana neutrinos testable c. Neutrinos masses stable 1 T M M M M M L D R D − = − 1 0 T M M M D R D − Flavor symmetry A Z 4 2 X. G. He, Y. Y. Keum & R. R.Volkas 06
Collider signatures (p1)+d(m2)→l(3)N(p)→l(2)+()+9(m)+()(△L=2) ∑/drd2fp(x1,(2)Fb(2,Q2)(ab→)q可) 10 10 10 10 10 10 个a 0 10 M, =0 GeV M,=10 GeV M,=100 Gev →M2=500GeV M2"1000ceV =O GeV M,GeV ,[Gev T. Han & B Zhang, 06: A. Atre, T Han, S Pascoli& B. Zhang, 09
Collider Signatures ( = L 2) T. Han & B. Zhang, 06; A. Atre, T. Han, S. Pascoli & B. Zhang,09
Define: do/dMi, ;=(do/ dM1i,+do/dM12s,7)/2 M-100 GeV Ma=115 Gev S10 10 10 0 10 10 200 400 600 50100150200250300 Mi [Gev GeV
Define: