  The first search at the LHC for the extinction of QCD jet production is
presented, using data collected with the CMS detector corresponding to an
integrated luminosity of 10.7 inverse femtobarns of proton-proton collisions at
a center-of-mass energy of 8 TeV. The extinction model studied in this analysis
is motivated by the search for signatures of strong gravity at the TeV scale
(terascale gravity) and assumes the existence of string couplings in the
strong-coupling limit. In this limit, the string model predicts the suppression
of all high-transverse-momentum standard model processes, including jet
production, beyond a certain energy scale. To test this prediction, the
measured transverse-momentum spectrum is compared to the theoretical prediction
of the standard model. No significant deficit of events is found at high
transverse momentum. A 95% confidence level lower limit of 3.3 TeV is set on
the extinction mass scale.
