Improved squark and gluino mass limits from searches for supersymmetry at hadron colliders

Abstract

Squarks and gluinos have been searched for at hadron colliders in events with multiple jets and missing transverse energy. No excess has been observed to date, and from a comparison of experimental cross section limits and theoretical cross section predictions one can deduce lower bounds on the squark and gluino masses. We present an improved analysis of squark and gluino mass bounds which is based on state-of-the-art cross section calculations including the summation of large threshold corrections. For illustration, we consider experimental data obtained by the CDF collaboration at the Fermilab Tevatron and discuss the impact of the improved cross section predictions on the squark and gluino mass limits.

Squark and gluino production cross sections in $$pp$$ p p collisions at $$\sqrt{s} = 13, 14, 33$$ s = 13 , 14 , 33 and $$100$$ 100 TeV

“…As a result, the SUSY-QCD corrections have a substantial impact on the determination of mass exclusion limits and would lead to a significant reduction of uncertainties on SUSY mass or parameter values in the case of discovery; see e.g. [ 8 ]. The processes listed in Eqs.…”

The Standard Model from LHC to future colliders

“… Threshold resummations are playing a role in setting limits for the masses of heavy new physics states, both colorless [ 326 – 328 ] and colored [ 329 – 332 ], which could be produced at hadron colliders. The reason is simple: if the states are heavy as compared to the available center-of-mass energy, they must be produced (if at all) near threshold.…”

Top-quark polarization and asymmetries at the LHC in the effective description of squark interactions

“…a K-factor of 1.8 [114] at next-to-next-to-leading-logarithmic (NNLL) accuracy [114][115][116][117][118][119][120] over the NLO cross section, resulting in an overall K-factor of 1.4, which has been considered for the calculations in table 6. We have also to take into account the K-factors for the SM which can be extracted from the well-known NNLO+NNLL QCD corrections to tt production [121][122][123][124][125], estimating an approximate K-factor of 1.1.…”