Measurement of masses in the tt‾ system by kinematic endpoints in pp collisions at √s =7 TeV

CMS Collaboration

doi:10.1140/epjc/s10052-013-2494-7

Measurement of masses in the tt‾ system by kinematic endpoints in pp collisions at √s =7 TeV

CMS Collaboration

Research output: Contribution to journal › Article › Research › peer-review

62 Citations (Scopus)

Abstract

A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt‾ events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb⁻¹ collected by the CMS experiment in pp collisions at √s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of M_t = 173.9 ± 0.9 (stat.)^+1.7_−2.1 (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.

Original language	English
Article number	2494
Number of pages	28
Journal	European Physical Journal C
Volume	73
Issue number	7
DOIs	https://doi.org/10.1140/epjc/s10052-013-2494-7
Publication status	Published - 2013
Externally published	Yes

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10.1140/epjc/s10052-013-2494-7

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Cite this

@article{a49d3d7c28ba459b8f69ce72dec5a541,

title = "Measurement of masses in the tt‾ system by kinematic endpoints in pp collisions at √s =7 TeV",

abstract = "A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt‾ events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb−1 collected by the CMS experiment in pp collisions at √s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of Mt = 173.9 ± 0.9 (stat.)+1.7−2.1 (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.",

author = "J Nash and {CMS Collaboration}",

year = "2013",

doi = "10.1140/epjc/s10052-013-2494-7",

language = "English",

volume = "73",

journal = "European Physical Journal C",

issn = "1434-6044",

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T1 - Measurement of masses in the tt‾ system by kinematic endpoints in pp collisions at √s =7 TeV

AU - Nash, J

AU - CMS Collaboration

PY - 2013

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N2 - A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt‾ events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb−1 collected by the CMS experiment in pp collisions at √s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of Mt = 173.9 ± 0.9 (stat.)+1.7−2.1 (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.

AB - A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt‾ events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb−1 collected by the CMS experiment in pp collisions at √s = 7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of Mt = 173.9 ± 0.9 (stat.)+1.7−2.1 (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics.

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DO - 10.1140/epjc/s10052-013-2494-7

M3 - Article

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VL - 73

JO - European Physical Journal C

JF - European Physical Journal C

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