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O-3 - As of 1998 no laboratory or astrophysical constraint excluded a TeV type-I string scale

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Properties7
type
observation
id
O-3
statement
As of 1998, no laboratory or astrophysical measurement excluded the TeV-string large-extra-dimension scenario; the strongest accelerator constraint - four-electron contact operators, accurately tested only up to ~100 GeV - is satisfied provided the string scale M_I is above ~1 TeV (and photon Regge excitations above ~300 GeV).
source
S-17 - Antoniadis, Arkani-Hamed, Dimopoulos, Dvali 1998 — millimeter-to-fermi dimensions and TeV strings
locator
§3.1, eq. (9); §4
quote
the scenario we propose is not experimentally excluded by any lab or astrophysical constraint we are aware of
link_state
linked

Compositeness bounds put the suppression scale of flavor-conserving higher-dimension operators at up to ~3 TeV; exchange of a (4+n)-dimensional graviton between electrons induces an operator ~ (n+2)^2 E^2/M_I^4 (psi-bar psi)^2, safely small for M_I above ~1 TeV given that the four-electron vertex was measured accurately only to ~100 GeV.

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