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dc.contributor.author
CMS Collaboration
dc.contributor.author
Khachatryan, Vardan
dc.contributor.author
Bachmair, Felix
dc.contributor.author
Bäni, Lukas
dc.contributor.author
Bianchini, Lorenzo
dc.contributor.author
Buchmann, Marco A.
dc.contributor.author
Casal, Bruno
dc.contributor.author
Chanon, Nicolas
dc.contributor.author
Dissertori, Günther
dc.contributor.author
Dittmar, Michael
dc.contributor.author
Donegà, Mauro
dc.contributor.author
Dünser, Marc
dc.contributor.author
Eller, Philipp
dc.contributor.author
Grab, Christoph
dc.contributor.author
Hits, Dmitry
dc.contributor.author
Hoss, Jan
dc.contributor.author
Lustermann, Werner
dc.contributor.author
Mangano, Boris
dc.contributor.author
Marini, Andrea C.
dc.contributor.author
Marionneau, Matthieu
dc.contributor.author
Martinez Ruiz del Arbol, Pablo
dc.contributor.author
Masciovecchio, Mario
dc.contributor.author
Meister, Daniel
dc.contributor.author
Mohr, Niklas
dc.contributor.author
Musella, Pasquale
dc.contributor.author
Nägeli, Christoph
dc.contributor.author
Nessi-Tedaldi, Francesca
dc.contributor.author
Pandolfi, Francesco
dc.contributor.author
Pauss, Felicitas
dc.contributor.author
Peruzzi, Marco
dc.contributor.author
Quittnat, Milena
dc.contributor.author
Rebane, Liis
dc.contributor.author
Rossini, Marco
dc.contributor.author
Starodumov, Andrey
dc.contributor.author
Takahashi, Maiko
dc.contributor.author
Theofilatos, Konstantinos
dc.contributor.author
Wallny, Rainer
dc.contributor.author
Weber, Hannsjörg A.
dc.contributor.author
et al.
dc.date.accessioned
2018-05-30T16:16:24Z
dc.date.available
2017-06-11T18:04:05Z
dc.date.available
2018-05-30T16:16:24Z
dc.date.issued
2015
dc.identifier.issn
0028-0836
dc.identifier.issn
1476-4687
dc.identifier.other
10.1038/nature14474
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/102020
dc.identifier.doi
10.3929/ethz-b-000102020
dc.description.abstract
The standard model of particle physics describes the fundamental particles and their interactions via the strong, electromagnetic and weak forces. It provides precise predictions for measurable quantities that can be tested experimentally. The probabilities, or branching fractions, of the strange B meson ( ) and the B0 meson decaying into two oppositely charged muons (μ+ and μ−) are especially interesting because of their sensitivity to theories that extend the standard model. The standard model predicts that the and decays are very rare, with about four of the former occurring for every billion mesons produced, and one of the latter occurring for every ten billion B0 mesons1. A difference in the observed branching fractions with respect to the predictions of the standard model would provide a direction in which the standard model should be extended. Before the Large Hadron Collider (LHC) at CERN2 started operating, no evidence for either decay mode had been found. Upper limits on the branching fractions were an order of magnitude above the standard model predictions. The CMS (Compact Muon Solenoid) and LHCb (Large Hadron Collider beauty) collaborations have performed a joint analysis of the data from proton–proton collisions that they collected in 2011 at a centre-of-mass energy of seven teraelectronvolts and in 2012 at eight teraelectronvolts. Here we report the first observation of the µ+µ− decay, with a statistical significance exceeding six standard deviations, and the best measurement so far of its branching fraction. Furthermore, we obtained evidence for the µ+µ− decay with a statistical significance of three standard deviations. Both measurements are statistically compatible with standard model predictions and allow stringent constraints to be placed on theories beyond the standard model. The LHC experiments will resume taking data in 2015, recording proton–proton collisions at a centre-of-mass energy of 13 teraelectronvolts, which will approximately double the production rates of and B0 mesons and lead to further improvements in the precision of these crucial tests of the standard model.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Nature Publ. Group
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-sa/3.0/
dc.title
Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported
dc.date.published
2015-05-13
ethz.journal.title
Nature
ethz.journal.volume
522
en_US
ethz.journal.issue
7554
en_US
ethz.pages.start
68
en_US
ethz.pages.end
72
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.identifier.nebis
000984850
ethz.publication.place
London
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich, direkt::00012 - Lehre und Forschung, direkt::00007 - Departemente, direkt::02010 - Departement Physik / Department of Physics::02532 - Institut für Teilchenphysik (IPP) / Institute for Particle Physics (IPP)::03381 - Pauss, Felicitas (emeritus)
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03593 - Dissertori, Günther / Dissertori, Günther
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03904 - Wallny, Rainer / Wallny, Rainer
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::08803 - Grab, Christoph (Tit.Prof.)
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich, direkt::00012 - Lehre und Forschung, direkt::00007 - Departemente, direkt::02010 - Departement Physik / Department of Physics::02532 - Institut für Teilchenphysik (IPP) / Institute for Particle Physics (IPP)::03381 - Pauss, Felicitas (emeritus)
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03593 - Dissertori, Günther / Dissertori, Günther
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03904 - Wallny, Rainer / Wallny, Rainer
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::08803 - Grab, Christoph (Tit.Prof.)
ethz.date.deposited
2017-06-11T18:04:44Z
ethz.source
ECIT
ethz.identifier.importid
imp593653464c5fd11233
ethz.ecitpid
pub:160137
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-18T13:30:57Z
ethz.rosetta.lastUpdated
2021-02-15T00:12:11Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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