Search for vector-like quarks in events with two oppositely charged leptons and jets in proton-proton collisions at [Formula: see text]

在质子-质子碰撞中,寻找具有两个带相反电荷的轻子和喷注的事件中的矢量夸克 [公式:见正文]

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Abstract

A search for the pair production of heavy vector-like partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton-proton collisions at [Formula: see text] . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9 fb-1 . Final states studied for TT¯ production include those where one of the T quarks decays via T → tZ and the other via T → bW , tZ , or tH , where H is a Higgs boson. For the BB¯ case, final states include those where one of the B quarks decays via B → bZ and the other B → tW , bZ , or bH . Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for T → tZ , and B → bZ , T and B quark mass values below 1280 and 1130 Ge , respectively, are excluded.

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