Search for scalar bottom quarks and third-generation leptoquarks in ppbar collisions at sqrt(s) = 1.96 TeV

TL;DR

This paper reports a search for scalar bottom quarks and third-generation leptoquarks in proton-antiproton collisions, setting new lower mass limits based on data from the Fermilab Tevatron Collider.

Contribution

It provides the first experimental lower mass limits for scalar bottom quarks and third-generation leptoquarks in proton-antiproton collisions at 1.96 TeV.

Findings

Lower mass limit for sbottom: 247 GeV at m_neutralino=0

Lower mass limit for leptoquark: 247 GeV

Constraints on new physics models involving these particles

Abstract

We report the results of a search for pair production of scalar bottom quarks (sbottom) and scalar third-generation leptoquarks in 5.2 fb-1 of ppbar collisions at the D0 experiment of the Fermilab Tevatron Collider. Scalar bottom quarks are assumed to decay to a neutralino and a $b$ quark, and we set 95% C.L. lower limits on their production in the (m_sbottom, m_neutralino) mass plane such as m_sbottom>247 GeV for m_neutralino=0 and m_neutralino>110 GeV for 160<m_sbottom<200 GeV. The leptoquarks are assumed to decay to a tau neutrino and a $b$ quark, and we set a 95% C.L. lower limit of 247 GeV on the mass of a charge-1/3 third-generation scalar leptoquark.