Search for the 2nd KK states of the mUED model at the LHC Kang Young Lee Konkuk U. Seoul YongPyong Greenpia, Yong Pyong 2012. 2. 20-23.

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Search for the 2nd KK states of the mUED model at the LHC Kang Young Lee Konkuk U. Seoul YongPyong Greenpia, Yong Pyong

Based on Sanghyeon Chang, Kang Young Lee, Jeonghyeon Song Phys. Lett. B708, 144 (2012). Phys. Rev. D, to appear In preparation

Outlines Introduction mUED model Search for the 2 nd KK Higgs bosons Search for the 2 nd KK W boson Search for the 2 nd KK Gluon (preliminary) Summary

Introduction : mUED at the LHC The phenomenology of the mUED model is definitely fixed with only one model parameter, 1/R. The 2 nd KK states are comparable to (or better than?) the 1 st KK states to be studied at colliders. Only the 2 nd KK CP-odd Higgs can be found at the LHC. The 2 nd KK W boson is a good candidate to be found at the early LHC. The ttbar resonance can give a (first) direct bound on the mUED at the Tevatron via the 2 nd KK gluon.

The universal extra dimension model (UED)

Virtues and drawbacks

The first vs. the second KK states m (2) ~ 2 m (1) (m (n) ~ ) The first KK states are KK parity-odd, while the second KK states are KK parity-even. The first KK states are produced in pairs, while the second KK states are singly produced due to the KK parity. The first KK states decay into the LKP + soft SM particles. The second KK states can decay into SM particles via loops. Comparable masses, less productions (loops), better detections (resonances).

KK expansions

Particle Spectra 1/R = 500 GeV, m h = 120 GeV, ΛR = 20

Search for the 2 nd KK Higgs bosons Higgs masses where

Top quark masses where diagonalized by

In 4D, the effective lagrangian is given by CP-odd KK state is produced via gluon fusion, while CP-even state canNOT.

The peak is very sharp compared with the SM Higgs.

Productions Assuming ∫L~ 100 fb -1, about 10,000 will be produced for 1/R = 400 GeV. About hundred events of are expected.

Background study Irreducible background is small. (e.g. ) Reducible background is huge from QCD events. ( of order mb)

Search for the 2 nd KK W boson W (2) masses where Direct production

indirect production

pp → W’ → eν / μν at the early LHC Selection criteria E T > 30 GeV Isolation radius CMS collab., PLB 698, 20 (2011) M T distribution

Soft SM particles We expect that the direct bound of the mUED will be obtained from the search for the W’ boson at the early LHC.

Soft SM particles It is difficult to probe the mUED through this channel at the Tevatron.

Search for the 2 nd KK Gluon (preliminary) pp → G (2) → ttbar (resonance)

Summary The loop-induced decays of the 2 nd KK states can be substantial in the mUED model. The CP-odd 2 nd neutral KK Higgs can be observed at the LHC in the future. The 2 nd KK W bosons will provide a direct bound on the mUED model at the early LHC (2012?). The 2 nd KK gluon provide a direct bound on the mUED model at the Tevatron through the resonant ttbar channel when Λ=50/R.

t1 – t2 mixing angle