期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 10, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP10(2015)150
关键词
Exotics; Lepton production; Hadron-Hadron Scattering; Beyond Standard Model; vector-like quarks; four-top-production; chiral b '; same charge top pair
资金
- ANPCyT, Argentina
- YerPhI, Armenia
- ARC, Australia
- BMWFW, Austria
- FWF, Austria
- ANAS, Azerbaijan
- SSTC, Belarus
- CNPq, Brazil
- FAPESP, Brazil
- NSERC, Canada
- NRC, Canada
- CFI, Canada
- CERN
- CONICYT, Chile
- CAS, China
- MOST, China
- NSFC, China
- COLCIENCIAS, Colombia
- MSMT CR, Czech Republic
- MPO CR, Czech Republic
- VSC CR, Czech Republic
- DNRF, Denmark
- DNSRC, Denmark
- Lundbeck Foundation, Denmark
- EPLANET, European Union
- ERC, European Union
- NSRF, European Union
- IN2P3-CNRS, France
- CEA-DSM/IRFU, France
- GNSF, Georgia
- BMBF, Germany
- DFG, Germany
- HGF, Germany
- MPG, Germany
- AvH Foundation, Germany
- GSRT, Greece
- NSRF, Greece
- RGC, China
- Hong Kong SAR, China
- ISF, Israel
- MINERVA, Israel
- GIF, Israel
- I-CORE, Israel
- Benoziyo Center, Israel
- INFN, Italy
- MEXT, Japan
- JSPS, Japan
- CNRST, Morocco
- FOM, Netherlands
- NWO, Netherlands
- BRF, Norway
- RCN, Norway
- MNiSW, Poland
- NCN, Poland
- GRICES, Portugal
- FCT, Portugal
- MNE/IFA, Romania
- MES of Russia, Russian Federation
- NRC KI, Russian Federation
- JINR
- MSTD, Serbia
- MSSR, Slovakia
- ARRS, Slovenia
- MIZS, Slovenia
- DST/NRF, South Africa
- MINECO, Spain
- SRC, Sweden
- Wallenberg Foundation, Sweden
- SER, Switzerland
- SNSF, Switzerland
- Cantons of Bern, Switzerland
- Cantons of Geneva, Switzerland
- NSC, Taiwan
- TAEK, Turkey
- STFC, United Kingdom
- the Royal Society, United Kingdom
- Leverhulme Trust, United Kingdom
- DOE, United States of America
- NSF, United States of America
- Direct For Mathematical & Physical Scien
- Division Of Physics [1119200] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506173] Funding Source: National Science Foundation
- Fundação para a Ciência e a Tecnologia [CERN/FIS-NUC/0005/2015] Funding Source: FCT
- STFC [PP/E000347/1, ST/L006480/1, ST/I006056/1, ST/K00137X/1, ST/K00073X/1, ST/G50228X/1, ST/H001093/2, ST/M001431/1, ST/K001329/1, ST/M001733/1, ST/I000178/1, ST/L003112/1, ST/N000277/1, ST/K001361/1, ST/M000761/1, ST/L00352X/1, ST/M002306/1, ST/L003511/1, ST/K001302/1, ST/K00140X/1, ST/N000420/1, ST/M001504/1, ST/J00474X/1, ST/N000463/1, ST/L000326/1, ST/M006980/1, ST/M001407/1, ST/K000705/1, ST/J005525/1, ST/J005487/1, ST/N000307/1, ST/H001093/1, ST/L001195/1, ST/L003414/1, ST/L001179/1, ST/I00372X/1, PP/E002846/1, PP/E000355/1, PP/D002915/1, ST/K001248/1, ST/H00100X/2, ST/L001144/1, ST/H00100X/1] Funding Source: UKRI
An analysis is presented of events containing jets including at least one b-tagged jet, sizeable missing transverse momentum, and at least two leptons including a pair of the same electric charge, with the scalar sum of the jet and lepton transverse momenta being large. A data sample with an integrated luminosity of 20.3 fb(-1) of pp collisions at root s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider is used. Standard Model processes rarely produce these final states, but there are several models of physics beyond the Standard Model that predict an enhanced rate of production of such events; the ones considered here are production of vector-like quarks, enhanced fourtop-quark production, pair production of chiral b '-quarks, and production of two positively charged top quarks. Eleven signal regions are defined; subsets of these regions are combined when searching for each class of models. In the three signal regions primarily sensitive to positively charged top quark pair production, the data yield is consistent with the background expectation. There are more data events than expected from background in the set of eight signal regions defined for searching for vector-like quarks and chiral b ' quarks, but the significance of the discrepancy is less than two standard deviations. The discrepancy reaches 2.5 standard deviations in the set of five signal regions defined for searching for four-top-quark production. The results are used to set 95% CL limits on various models.
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