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Unusual signatures of spin-1 resonances

based on 0807.5087 0801.4235. Unusual signatures of spin-1 resonances. keywords: Z-prime , Z-star W-prime , W-star. Mihail V. Chizhov Sofia University, Bulgaria a nd JINR, Russia. g , W ± , Z …. … till now:. a belian U(1)’ extension → Z’.

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Unusual signatures of spin-1 resonances

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  1. based on 0807.5087 0801.4235 Unusual signatures of spin-1 resonances keywords: Z-prime,Z-star W-prime,W-star Mihail V. Chizhov Sofia University, Bulgaria and JINR, Russia

  2. g, W±, Z … … till now: abelian U(1)’ extension → Z’ or adjoint representation of SU(2)’ extension → Z’,W’

  3. Canonical signature of spin-1 resonance is not complete !

  4. What about bosons in fundamental reps. of SU(2)L SU(3) extensions, extra spatial dimentions… MC and G. Dvali, in preparation i.e. with the internal quantum numbers identical to the SM Higgs doublet. Due to their quantum numbers, to the leading order such bosons can only have anomalous chiral interactions with the SM fermions,

  5. Technicolor techni-pions, techni-rhos, techni-omegas … What else? ? ? ?

  6. Invariant dilepton mass distributions Several models predict high mass resonances that could decay into dileptons (Z’, G, TC, KK, …) Z Z’ Z* MZ

  7. Angular distribution of Z* Z* p p

  8. Spin-1 and graviton angular distributions

  9. Comparison between Z’ and Z*for

  10. Conclusions • There are intense searches for excited fermions, but not for excitedbosons at electroweak scale. • In contrast to the gauge bosons the excited bosons have anomalous chiral couplings to matter. This leads to a distinctive signature of their production at the hadron colliders. • The clearest channel for their discovery by the early LHC data should be the dilepton one.

  11. Excited particles (compositeness) Searches for excited fermions y *have been fulfilled at all powerful colliders, such as LEP, HERA and Tevatron. They are also included in experimental program at the LHC. y* why not Z* ? Z* has differentinteractions than Z’ !

  12. Dilepton resonances

  13. Jacobian factor for M=1 TeV Z’ Z* “The divergence at q = p/2 which is the upper endpoint pTM/2 of the pT distribution stem from the Jacobian factor and is known as a Jacobian peak ; it is characteristic ofalltwo-body decays…” V. Barger “Collider physics” w r o n g !

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