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- W2582651305 abstract "The matter we know constitutes around 5% of the mass of the Universe. What the rest of the Universe is made of has remained unknown; it can not be made of any known fundamental particle and must entail new type of physics. The dissertation describes a search for the new type of physics. The signs of various New Physics models were looked for in extremely rare decays of subatomic particles, called neutral B mesons (B_s and B^0). In the established theory of elementary particles (The Standard Model) only around three in a billion B_s mesons decay into two muons (heavier cousins of electrons). Measuring more decays than expected would be a clear sign of New Physics. The main result of the dissertation is the first observation of B_s meson decays into two muons in a combined analysis of CMS and LHCb. The observation is a milestone for rare B decays representing the end of searches that started three decades ago. The measured number of B_s meson decays to two muons is very close to the Standard Model expectation. The uncertainties, however, are large and mild New Physics effects cannot be excluded. Surprisingly, the same analysis also showed evidence for an even rarer decay: a B^0 meson decay to two muons. The result has still large uncertainties, but the current number of measured B^0 decay candidates exceeds the expectations by almost 4 times. Physicists are hoping the new data will clarify whether this could be a sign of New Physics." @default.
- W2582651305 created "2017-02-03" @default.
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- W2582651305 date "2016-04-26" @default.
- W2582651305 modified "2023-09-25" @default.
- W2582651305 title "Discovery Of Rare B Decays: First observation of the Bs->μ+μ- decay, first evidence of the B0->μ+μ- decay" @default.
- W2582651305 hasPublicationYear "2016" @default.
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