Tag: News
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RKstar
LHCb finds new hints of possible deviations from the Standard Model. BROKEN IMAGE NOT MOVED (drupal url : https://astro.web.cern.ch//news/rkstar) Today, at a seminar at CERN, the LHCb collaboration presented results on the measurement of RK*0, which is the ratio of the probabilities that a B0 meson decays to K*0μ+μ– and to K*0e+e–. The K*0 meson
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pHe
Can cosmic-ray antiprotons unveil dark matter collisions? This week, at the 52nd Rencontres de Moriond EW in La Thuile Italy, LHCb presented results of an analysis which may have significant consequences for the search for “dark matter” in the universe. The measurement is of antiproton production in proton-helium (p-He) collisions. Although the LHC collides protons
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Omega_c
Observation of five new narrow Ωc0 excited states. As NASA announced a few days ago the discovery of the first system of seven Earth-size planets orbiting around a single star, so LHCb unveiled today the discovery of a new system of five particles, with the observation of five new narrow Ωc0 excited states. LHCb physicists
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ValAoste
The LHCb collaboration presented several new results at the 31st Rencontres de Physique de la Vallée d’Aoste taking place this week in La Thuile, Italy. A few selected items are listed below. Processes where a B meson decays into a pair of oppositely charged leptons are powerful probes in the search for physics beyond the
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BsMuMu2017
From discovery to precision measurement. [ Branching fraction Bs0→ μ+μ– = (3.0±0.6+0.3-0.2)x10-9 ; B0→ μ+μ– < 3.4×10-10 ] Today, in a seminar at CERN, the LHCb collaboration presented the first observation by a single experiment of the decay Bs0→μ+μ–, with a statistical significance of 7.8 standard deviations. The measured branching fraction (3.0±0.6+0.3-0.2)x10-9 is in agreement
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BaryonCP
Towards an important milestone in particle physics. The LHCb collaboration has published today in Nature Physics the first evidence for the violation of the CP symmetry in baryon decays with statistical significance of 3.3 standard deviations (σ). CP violation has been observed in K and B meson decays, but not yet in any baryon decay.
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End2016
The 2016 data taking period ended this morning. This was a very successful year, both because of the excellent performance of the accelerator and of the LHCb experiment itself. The left and central images below show the growth in integrated luminosity during different years of LHC operation. Integrated luminosity is a measure of the number
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CKM2016
The LHCb collaboration presented several new results at the 9th International Workshop on the CKM Unitarity Triangle (CKM2016) taking place this week at the Tata Institute of Fundamental Research in Mumbai, India. A few selected items are listed below. (1) A surprising first observation of a decay of the charm beauty meson. LHCb searched for
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Charm2016
The LHCb collaboration presented many new interesting results at the VIIIth International Workshop on Charm Physics (Charm 2016) which took place in Bologna. In particular, precise measurements on the difference between the lifetime of D0 mesons, composed of a cu quark pair, and their partner D0 mesons, with opposite quark content cu (when decaying either
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LHC2016
The LHC collider and the LHCb detector continue to work very well. LHCb has collected already 1 fb-1 (integrated luminosity) of data this year, three times more than in 2015. Given that 7 more weeks of proton-proton collisions remain in this year’s schedule, it can be hoped that the final data set will be significantly