Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at sqrt(s)=8 TeV
V. Khachatryan
,
M. Besancon
(1)
,
F. Couderc
(1)
,
M. Dejardin
(1)
,
D. Denegri
(1)
,
B. Fabbro
(1)
,
J.L. Faure
(1)
,
C. Favaro
(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)
,
J. Rander
(1)
,
A. Rosowsky
(1)
,
M. Titov
(1)
,
S. Baffioni
(2)
,
F. Beaudette
(2)
,
P. Busson
(2)
,
E. Chapon
(2)
,
C. Charlot
(2)
,
T. Dahms
(2)
,
M. Dalchenko
(2)
,
L. Dobrzynski
(2)
,
N. Filipovic
(2)
,
A. Florent
(2)
,
R. Granier de Cassagnac
(2)
,
L. Mastrolorenzo
(2)
,
P. Mine
(2)
,
I.N. Naranjo
(2)
,
M. Nguyen
(2)
,
C. Ochando
(2)
,
G. Ortona
(2)
,
P. Paganini
(2)
,
S. Regnard
(2)
,
R. Salerno
(2)
,
J.B. Sauvan
(2)
,
Y. Sirois
(2)
,
C. Veelken
(2)
,
Y. Yilmaz
(2)
,
A. Zabi
(2)
,
J.-L. Agram
(3)
,
J. Andrea
(3)
,
A. Aubin
(3)
,
D. Bloch
(3)
,
J.-M. Brom
(3)
,
E.C. Chabert
(3)
,
C. Collard
(3)
,
E. Conte
(3)
,
J.-C. Fontaine
(3)
,
D. Gele
(3)
,
U. Goerlach
(3)
,
C. Goetzmann
(3)
,
A.-C. Le Bihan
(3)
,
K. Skovpen
(3)
,
P. Van Hove
(3)
,
S. Gadrat
(4)
,
S. Beauceron
(5)
,
N. Beaupere
(5)
,
C. Bernet
(5)
,
G. Boudoul
(5)
,
E. Bouvier
(5)
,
S. Brochet
(5)
,
C.A. Carrillo Montoya
(5)
,
J. Chasserat
(5)
,
R. Chierici
(5)
,
D. Contardo
(5)
,
B. Courbon
(5)
,
P. Depasse
(5)
,
H. El Mamouni
(5)
,
J. Fan
(5)
,
J. Fay
(5)
,
S. Gascon
(5)
,
M. Gouzevitch
(5)
,
B. Ille
(5)
,
T. Kurca
(5)
,
M. Lethuillier
(5)
,
L. Mirabito
(5)
,
A.L. Pequegnot
(5)
,
S. Perries
(5)
,
J.D. Ruiz Alvarez
(5)
,
D. Sabes
(2)
,
L. Sgandurra
(5)
,
V. Sordini
(5)
,
M. Vander Donckt
(5)
,
P. Verdier
(5)
,
S. Viret
(5)
,
H. Xiao
(5)
V. Khachatryan
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P. Busson
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R. Granier de Cassagnac
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P. Paganini
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J.-L. Agram
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C. Collard
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E. Conte
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M. Gouzevitch
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M. Lethuillier
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V. Sordini
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P. Verdier
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Résumé
A search for resonances and quantum black holes is performed using the dijet mass spectra measured in proton-proton collisions at sqrt(s)=8 TeV with the CMS detector at the LHC. The data set corresponds to an integrated luminosity of 19.7 inverse femtobarns. In a search for narrow resonances that couple to quark-quark, quark-gluon, or gluon-gluon pairs, model-independent upper limits, at 95% confidence level, are obtained on the production cross section of resonances, with masses above 1.2 TeV. When interpreted in the context of specific models the limits exclude: string resonances with masses below 5.0 TeV; excited quarks below 3.5 TeV; scalar diquarks below 4.7 TeV; W' bosons below 1.9 TeV or between 2.0 and 2.2 TeV; Z' bosons below 1.7 TeV; and Randall-Sundrum gravitons below 1.6 TeV. A separate search is conducted for narrow resonances that decay to final states including b quarks. The first exclusion limit is set for excited b quarks, with a lower mass limit between 1.2 and 1.6 TeV depending on their decay properties. Searches are also carried out for wide resonances, assuming for the first time width-to-mass ratios up to 30%, and for quantum black holes with a range of model parameters. The wide resonance search excludes axigluons and colorons with mass below 3.6 TeV, and color-octet scalars with mass below 2.5 TeV. Lower bounds between 5.0 and 6.3 TeV are set on the masses of quantum black holes.