Oblique parameter constraints on large extra dimensions

dimensional bulk of spacetime and the Standard Model particles are confined to a 3-brane. We calculate the gauge boson self-energy corrections arising from the exchange of virtual gravitons and present our results in the

STU

-formalism. We find that the new physics contributions to

S

,

T

and

U

decouple in the limit that the string scale

M_S

goes to infinity. The oblique parameters constrain the lower limit on

M_S

. Taking the quantum gravity cutoff to be

M_S

,

S

-parameter constraints impose

M_S>1.55

TeV for

n=2

at the 1

\sigma

level.

T

-parameter constraints impose

M_S>1.25 (0.75)

TeV for

n=3 (6)

.

Note:

Version to appear in PRD

Kaluza-Klein model
dimension: >4
gauge field theory: SU(3)
Salam-Weinberg model
membrane model: p-brane
p-brane: 3
graviton: exchange
perturbation theory: higher-order
mass spectrum
numerical calculations

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Figures(6)

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