Measurement of masses in the t t-bar system by kinematic endpoints in pp collisions at sqrt(s)=7 TeV
S. Chatrchyan
,
M. Besançon
(1)
,
S. Choudhury
(1)
,
F. Couderc
(1)
,
M. Dejardin
(1)
,
D. Denegri
(1)
,
B. Fabbro
(1)
,
J.L. Faure
(1)
,
F. Ferri
(1)
,
S. Ganjour
(1)
,
A. Givernaud
(1)
,
P. Gras
(1)
,
G. Hamel de Monchenault
(1)
,
P. Jarry
(1)
,
E. Locci
(1)
,
J. Malcles
(1)
,
L. Millischer
(1)
,
A. Nayak
(1)
,
J. Rander
(1)
,
A. Rosowsky
(1)
,
M. Titov
(1)
,
S. Baffioni
(2)
,
F. Beaudette
(2)
,
L. Benhabib
(2)
,
L. Bianchini
(2)
,
M. Bluj
(2)
,
Pierre Busson
(2)
,
C. Charlot
(2)
,
N. Daci
(2)
,
T. Dahms
(2)
,
M. Dalchenko
(2)
,
L. Dobrzynski
(2)
,
A. Florent
(2)
,
R. Granier de Cassagnac
(2)
,
M. Haguenauer
(2)
,
P. Mine
(2)
,
C. Mironov
(2)
,
I.N. Naranjo
(2)
,
M. Nguyen
(2)
,
C. Ochando
(2)
,
P. Paganini
(2)
,
D. Sabes
(2)
,
R. Salerno
(2)
,
Y. Sirois
(2)
,
C. Veelken
(2)
,
A. Zabi
(2)
,
J.-L. Agram
(3)
,
J. Andrea
(3)
,
D. Bloch
(3)
,
D. Bodin
(3)
,
J.-M. Brom
(3)
,
E.C. Chabert
(3)
,
C. Collard
(3)
,
E. Conte
(3)
,
F. Drouhin
(3)
,
J.-C. Fontaine
(3)
,
D. Gele
(3)
,
U. Goerlach
(3)
,
C. Goetzmann
(3)
,
P. Juillot
(3)
,
A.-C. Le Bihan
(3)
,
P. van Hove
(3)
,
S. Beauceron
(4)
,
N. Beaupere
(4)
,
G. Boudoul
(4)
,
S. Brochet
(4)
,
J. Chasserat
(4)
,
R. Chierici
(4)
,
D. Contardo
(4)
,
P. Depasse
(4)
,
H. El Mamouni
(4)
,
J. Fay
(4)
,
S. Gascon
(4)
,
M. Gouzevitch
(4)
,
B. Ille
(4)
,
T. Kurca
(4)
,
M. Lethuillier
(4)
,
L. Mirabito
(4)
,
S. Perries
(4)
,
L. Sgandurra
(4)
,
V. Sordini
(4)
,
Y. Tschudi
(4)
,
M. Vander Donckt
(4)
,
P. Verdier
(4)
,
S. Viret
(4)
S. Chatrchyan
- Function : Author
S. Baffioni
- Function : Author
- PersonId : 20331
- IdHAL : stephanie-barrillon
- ORCID : 0000-0002-7075-1673
Pierre Busson
- Function : Author
- PersonId : 742252
- IdHAL : pierre-busson-cnrsgr
- ORCID : 0000-0003-1027-3400
- IdRef : 096371706
R. Granier de Cassagnac
- Function : Author
- PersonId : 739189
- IdHAL : raphgrandecass
- ORCID : 0000-0002-1275-7292
- IdRef : 132136651
C. Mironov
- Function : Author
- PersonId : 1196248
- IdHAL : camelia-mironov
P. Paganini
- Function : Author
- PersonId : 739173
- IdHAL : pascal-paganini
- ORCID : 0000-0001-9580-683X
- IdRef : 183219406
J.-L. Agram
- Function : Author
- PersonId : 1147753
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C. Collard
- Function : Author
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- IdHAL : caroline-collard
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E. Conte
- Function : Author
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- IdHAL : eric-conte
- ORCID : 0000-0003-3154-3123
- IdRef : 122530209
P. van Hove
- Function : Author
- PersonId : 742701
- IdHAL : pierre-van-hove
- ORCID : 0000-0002-2431-3381
- IdRef : 264250834
M. Gouzevitch
- Function : Author
- PersonId : 741096
- IdHAL : maxime-gouzevitch
- ORCID : 0000-0002-5524-880X
- IdRef : 13627160X
M. Lethuillier
- Function : Author
- PersonId : 740178
- IdHAL : morgan-lethuillier
- ORCID : 0000-0001-6185-2045
- IdRef : 090177835
V. Sordini
- Function : Author
- PersonId : 739810
- IdHAL : viola-sordini
- ORCID : 0000-0003-0885-824X
- IdRef : 128184035
S. Viret
- Function : Author
- PersonId : 1093632
- IdHAL : seb-viret
- ORCID : 0000-0002-1935-623X
Abstract
A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for t t-bar events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns collected by the CMS experiment in pp collisions at sqrt(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.) +1.6/-2.0 (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.