Measurement of the top-quark mass in the fully hadronic decay channel from ATLAS data at $$\sqrt{s}=7\mathrm{\,TeV}$$
© 2015, CERN for the benefit of the ATLAS Collaboration. The mass of the top quark is measured in a data set corresponding to 4.6 fb -1 of proton–proton collisions with centre-of-mass energy √ = 7TeV collected by the ATLAS detector at the LHC. Events consistent with hadronic decays of top–antitop quark pairs with at least six jets in the final state are selected. The substantial background from multijet production is modelled with data-driven methods that utilise the number of identified b-quark jets and the transverse momentum of the sixth leading jet, which have minimal correlation. The top-quark mass is obtained from template fits to the ratio of three-jet to dijet mass. The three-jet mass is calculated from the three jets produced in a top-quark decay. Using these three jets the dijet mass is obtained from the two jets produced in the W boson decay. The top-quark mass obtained from this fit is thus less sensitive to the uncertainty in the energy measurement of the jets. A binned likelihood fit yields a top-quark mass of m t = 175.1 ± 1.4 (stat.) ± 1.2 (syst.) GeV.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231; SC00112704; AC03-76SF00515
- OSTI ID:
- 1225011
- Alternate ID(s):
- OSTI ID: 1225220; OSTI ID: 1407347
- Journal Information:
- European Physical Journal. C, Particles and Fields, Vol. 75, Issue 4; ISSN 1434-6044
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Top-quark physics at the Large Hadron Collider
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journal | May 2017 |
Measurement of the top quark mass in the all-jets final state at $$\sqrt{s}=13\,\text {TeV} $$ s = 13 TeV and combination with the lepton+jets channel
|
journal | April 2019 |
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