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Determination of an upper limit for the mass of the τ-neutrino at LEP
Author(s) -
R. Akers,
G. Alexander,
J. Allison,
K. J. Anderson,
S. Arcelli,
S. Asai,
A. Astbury,
D. Axen,
G. Azuelos,
A. H. Ball,
E. L. Barberio,
R. J. Barlow,
R. Bartoldus,
J. R. Batley,
G. Beaudoin,
A. Beck,
H. P. Beck,
J. Becker,
C. Beeston,
T. Behnke,
K. W. Bell,
G. Bella,
P. Bentkowski,
S. Bentvelsen,
P. Berlich,
S. Bethke,
O. Biebel,
I.J. Bloodworth,
P. Bock,
H. M. Bosch,
M. Boutemeur,
S. Braibant,
P. Bright-Thomas,
R. M. Brown,
A. Buijs,
H. Burckhart,
C. D. Burgard,
P. Capiluppi,
R.K. Carnegie,
A. A. Carter,
J. R. Carter,
C.Y. Chang,
C. Charlesworth,
D. G. Charlton,
S. L. Chu,
P. E. L. Clarke,
J. C. Clayton,
S. G. Clowes,
I. Cohen,
J.E. Conboy,
M. Coupland,
M. Cuffiani,
S. Dado,
C. Dallapiccola,
G. M. Dallavalle,
C. Darling,
S. J. de Jong,
Huiqiu Deng,
M. Dittmar,
M.S. Dixit,
E. do Couto e Silva,
J. E. Duboscq,
E. Duchovni,
G. Duckeck,
I. P. Duerdoth,
U. C. Dunwoody,
P.A. Elcombe,
P.G. Estabrooks,
E. Etzion,
H. Evans,
F. Fabbri,
B. Fabbro,
M. Fanti,
M. Fierro,
M. Fincke-Keeler,
H.M. Fischer,
P. Fischer,
R. Folman,
D.G. Fong,
M. Foucher,
H. Fukui,
A. Fürtjes,
P. Gag,
A. Gaidot,
J. W. Gary,
J. Gascon,
N. I. Geddes,
Ch. Geich-Gimbel,
S.W. Gensler,
F. X. Gentit,
T. Geralis,
P. Giacomelli,
R. Giacomelli,
V. Gibson,
W.R. Gibson,
J.D. Gillies,
J. Goldberg,
D. M. Gingrich,
M.J. Goodrick,
W. Gorn,
C. Grandi,
P. D. Grannis,
E. Gross,
J. Hagemann,
G.G. Hanson,
M. Hansroul,
C. K. Hargrove,
J.C. Hart,
P. A. Hart,
M. Hauschild,
C. M. Hawkes,
E. Heflin,
R.J. Hemingway,
G. Herten,
R.D. Heuer,
J. C. Hill,
S. J. Hillier,
T. Hilse,
D. A. Hinshaw,
P. R. Hobson,
D. Hochman,
A. Höcker,
Robert Homer,
A. K. Honma,
Robert Howard,
R.E. Hughes-Jones,
R. Humbert,
P. Igo-Kemenes,
H. Ihssen,
D.C. Imrie,
A. Jawahery,
P.W. Jeffreys,
H. Jérémie,
M. Jimack,
M. Jones,
R. W. L. Jones,
P. Jovanović,
C. C. H. Jui,
D. Karlen,
K. Kawagoe,
T. Kawamoto,
R. Keeler,
R. G. Kellogg,
B. W. Kennedy,
B. King,
J. King,
S. Kluth,
T. Kobayashi,
M. Kobel,
D. S. Koetke,
T. Kokott,
S. Komamiya,
R. Kowalewski,
P. Krieger,
J. Krogh,
P. Kyberd,
G. Lafferty,
H. Lafoux,
R. Lahmann,
I. Lauber,
J. G. Layter,
P. Leblanc,
P. Le Dû,
A. M. Lee,
E. Lefebvre,
M.H. Lehto,
D. Lellouch,
C. Leroy,
J. Letts,
L. J. Levinson,
Z. Li,
F. Liu,
S. L. Lloyd,
F. K. Loebinger,
G. D. Long,
B. Lorazo,
M. J. Losty,
X. C. Lou,
J. Ludwig,
A. Luig,
M. Mannelli,
S. Marcellini,
C. Markus,
A. J. Martin,
J.P. Martin,
T. Mashimo,
P. Mättig,
U. Maur,
J. A. McKenna,
T. McMahon,
A. I. McNab,
J.R. McNutt,
F. Meijers,
F. S. Merritt,
H. Mes,
A. Michelini,
R. P. Middleton,
G. Mikenberg,
J. Mildenberger,
D.J. Miller,
R. Mir,
W. Mohr,
C. Moisan,
A. Montanari,
T. Mori,
M. Morii,
U. Müller,
B. Nellen,
B. Nijjhar,
S.W. OʼNeale,
F. G. Oakham,
F. Odorici,
H. Ogren,
C. J. Oram,
M. J. Oreglia,
S. Orito,
J.P. Pansart,
G. N. Patrick,
M. J. Pearce,
P. Pfister,
P. D. Phillips,
J. E. Pilcher,
J. L. Pinfold,
D. Pitman,
D.E. Plane,
P. Poffenberger,
B. Poli,
A. Posthaus,
T.W. Pritchard,
H. Przysiezniak,
M.W. Redmond,
D.L. Rees,
D. Rigby,
M. Rison,
S.A. Robins,
D. Robinson,
J. M. Roney,
E. Ros,
S. Rossberg,
M. Rosvick,
P. Routenburg,
Y. Rozen,
K. Runge,
Ö. Runólfsson,
D. R. Rust,
M. Sasaki,
C. Sbarra,
A.D. Schaile,
O. Schaile,
F. Scharf,
P. Scharff-Hansen,
P. Schenk,
B. Schmitt,
H. Schmitt,
M. Schröder,
H.-C. Schultz-Coulon,
Philipp Schütz,
Michael Schulz,
C. Schwick,
J. Schwiening,
W. G. Scott,
M. Settles,
T. Shears,
B. C. Shen,
C. H. Shepherd-Themistocleous,
P. Sherwood,
G. P. Siroli,
A. Skillman,
A. Skuja,
Andrew Smith,
T. J. Smith,
G. A. Snow,
R. Sobie,
R. W. Springer,
M. Sproston,
A. Stahl,
C. Stegmann,
K. Stephens,
J. Steuerer,
B. Stockhausen,
R. Ströhmer,
D. Strom,
P. Szymański,
H. Takeda,
T. Takeshita,
S. Tarem,
M. Tecchio,
P. Teixeira-Dias,
N. Tesch,
M. Thomson,
S. Towers,
T. Tsukamoto,
M. F. Watson,
D. Van den plas,
R. Van Kooten,
G. Vasseur,
M. G. Vincter,
A. Wagner,
D.L. Wagner,
C. P. Ward,
D. R. Ward,
J.J. Ward,
P. M. Watkins,
A. T. Watson,
N. K. Watson,
P. Weber,
P. S. Wells,
N. Wermes,
B. Wilkens,
G. Wilson,
J. A. Wilson,
V-H. Winterer,
T. Wlodek,
W. Wiedenmann,
S. Wotton,
T. R. Wyatt,
A. Yeaman,
G. Yekutieli,
M. Yurko,
Wolfram Dietrich Zeuner,
G. T. Zorn
Publication year - 1995
Publication title -
zeitschrift für physik c
Language(s) - English
Resource type - Journals
eISSN - 1431-5858
pISSN - 0170-9739
DOI - 10.1007/bf01571874
Subject(s) - physics , neutrino , particle physics , limit (mathematics) , pion , confidence interval , invariant mass , nuclear physics , bar (unit) , kinematics , multiplicity (mathematics) , mass distribution , statistics , mathematics , geometry , astrophysics , mathematical analysis , classical mechanics , galaxy , meteorology
An upper limit for the?t mass is determined through the kinematic reconstruction of the decayt?5p±?t in the OPAL detector at LEP. The limit is obtained using a new method based on the comparison of the two-dimensional distribution of energy and invariant mass of the five-pion system with expectations from different neutrino mass hypotheses. From a sample of five events surviving the selection criteria we obtain an upper limit of 74 MeV at 95% confidence level. It is the first measurement at LEP energies, where the larger average multiplicity of$$e^ +  e^ -   \to q\bar q$$ events makes the suppression of this background more robust compared to lower energies.

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