期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 27, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.271802
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- FMSR (Austria)
- FNRS
- FWO (Belgium)
- CNPq
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- FAPESP (Brazil)
- MES (Bulgaria)
- CERN
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- Academy of Finland
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- MST
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- DOE
- NSF (U.S.)
- JINR (Belarus)
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- JINR (Ukraine)
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- STFC [ST/F006748/1, ST/I000410/1, ST/I005912/1, ST/F007094/1, ST/I002200/1, ST/I505572/1, ST/H00081X/2, ST/G502347/1] Funding Source: UKRI
- Science and Technology Facilities Council [CMS, GRIDPP] Funding Source: researchfish
A search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14 fb(-1), the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T -> tZ, a T quark with a mass less than 475 GeV/c(2) is excluded at the 95% confidence level.
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