Some features of processes with gauge bosons in models with

large extra dimensions

E.E. Boos, M.A. Perfilov,

M.N. Smolyakov, I.P. Volobuev

Skobeltsyn Institute of Nuclear Physics, Moscow State University

Models with large extra dimensions

• ADD scenario

small mass gaps between KK-modes

• Randall-Sundrum model

large mass gaps between KK-modes

KK decomposition

SM current

Effective action

- tensor structure of the propagator with p=0

Effective contact interactions

- Effective coupling constant

The interference

Gravity in the bulk, stabilized RSE.E. Boos, V.E. Bunichev, M.N. Smolyakov, I.P. Volobuev Phys. Rev. D 79 (2009) 104013

Bulk gauge fields in RS model

H. Davoudiasl, J.L. Hewett, T.G. Rizzo, Phys. Lett. B 473 (2000) 43

Symbolic and numerical computations,

including simulations of the SM

background for LHC,

have been performed by means of

the CompHEP package.

The corresponding Feynman rules have

been implemented

into this version of the CompHEP.

Single-top production

2' WM TeV, 8.2_' sumWM TeV, 7.65' W GeV

2' WM TeV, 8.2_' sumWM TeV, 7.65' W GeV

3' WM TeV, 2.4_' sumWM TeV, 7.98' W GeV

3' WM TeV, 2.4_' sumWM TeV, 7.98' W GeV

Drell-Yan processes

,Zuu

','Zuu

,3.2' ZM ,2.3_' sumZM ,2' M,026.0' Z 021.0' (TeV),8.2_' sumM

,3.2' ZM ,2.3_' sumZM ,2' M,026.0' Z 021.0' (TeV),8.2_' sumM

,4.3' ZM ,8.4_' sumZM ,3' M,034.0' Z 031.0' (TeV),2.4_' sumM

,4.3' ZM ,8.4_' sumZM ,3' M,034.0' Z 031.0' (TeV),2.4_' sumM

Conclusion

• The KK modes should be taken into account because they can make contribution to the amplitudes of the corresponding processes

• Single W’’ or Z’’ can also provide analogous effect, but

• Simultaneous effects with KK gravitons and W’, Z’ KK modes can be interpreted in favor of the existence of extra dimensions