Tag: News
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Lambdab1D
Today at the EPS-HEP conference, the LHCb collaboration announced the discovery of two new beauty baryon particles. These particles are interpreted as excited states of the Λb0 baryon. The new structures are observed in the Λb0π+π– spectrum using the full LHCb Run 1 and Run 2 data set, corresponding to an integrated luminosity of 9fb-1.
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Phis19
φs = -0.041±0.025 rad (LHCb) φs = -0.055±0.021 rad (World) The LHCb collaboration has submitted for publication an updated measurement of the CP-violating phase φs in Bs0 meson decays. The precision measurement of φs is one of the most important goals of the LHCb experiment. In the wonderful world of quantum mechanics a Bs0 meson
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Pentaq
m(Pc+(4312)) = 4311.9±0.7+6.8/-0.6 MeV, Γ = 9.8±2.7+3.7/-4.5 MeV m(Pc+(4440)) = 4440.3±1.3+4.1/-4.7 MeV, Γ = 20.6±4.9+8.7/-10.1 MeV m(Pc+(4457)) = 4457.3±0.6+4.1/-1.7 MeV, Γ = 6.4±2.0+5.7/-1.9 MeV Today at the Rencontres de Moriond QCD conference, the LHCb collaboration announced the discovery of a new narrow pentaquark particle, Pc(4312)+, decaying to a J//ψ and a proton, with a statistical
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RK2
BROKEN IMAGE NOT MOVED (drupal url : https://astro.web.cern.ch//news/rk2) Today at the Rencontres de Moriond EW conference, the LHCb Collaboration presented an updated measurement of the ratio RK, an important test of a principle of the Standard Model of particle physics known as “lepton universality“, which states that the Standard Model treats the three charged leptons
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CPVcharm
An important milestone in the history of particle physics. [ ΔACP = (-0.154±0.029)% ] The LHCb collaboration has just presented at the Rencontres de Moriond EW and in a special CERN Seminar the first observation of CP violation in charm particle decays. Quarks can be split into two sectors: those with the same electrical charge
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BcPlus
Observation of an excited Bc+ state. This week the LHCb collaboration announced the observation of an excited Bc+ state, confirming measurements by the ATLAS and CMS collaborations. The results were presented at the conference “Rencontres de Physique de la Vallée d’Aoste” held at La Thuile, Italy. The Bc+ particle is a very interesting meson composed
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Charmonium
… and study of near-threshold D0D0 spectroscopy. [mX(3842) = 3842.72±0.16±0.12 MeV/c2; ΓX(3842) = 2.79±0.51±0.35 MeV ] This week the LHCb Collaboration announced the discovery of a new particle made of a charm and anti-charm quark. The results, which were presented at the International Workshop “e+e- Collisions From Phi to Psi 2019” held in Novosibirsk, are
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Celebration
The LHC Run 2 ended on December 3, see the corresponding news. The current experiment will be largely dismantled and an almost completely new detector constructed during the two-year-long shutdown: a new LHCb will be born in 2021. The major fraction of LHCb’s sub-detectors will be replaced or upgraded during this shutdown. Last week about
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Run2End
End of 2018 data taking period marking the end of Run 2. At the end of every year, the CERN accelerator complex ends its operation for the usual winter shutdown, in which particle accelerators and experiments perform necessary maintence. But today, when the LHC stopped at 4:38 am, marks the beginning of something very different:
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LHCCCKM
The LHCb Collaboration presented new interesting results at the Large Hadron Collider Committee (LHCC) open session and at the CKM workshop in Heidelberg. Selected topics are listed below. (1) Observation of two new particles in the Λb0π± system. LHCb physicists observed and studied two new Σb particles—as well as four known ones—in the invariant mass