Tag: News
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Xenon
Yesterday evening the first xenon-xenon ion collisions took place at LHC and the run lasted for seven hours. The left image below shows the corresponding LHC control screen announcing the “Stable Beam” conditions for the data taking. The right image shows a collision event recorded and analysed online by the LHCb data acquisition system. The
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RJpsi
Measurement of R(J/ψ): the ratio of branching fractions between Bc+→J/ψτ+ντ and Bc+→J/ψμ+νμ using τ+→ μ+νμ ντ decays. [R(J/ψ) = 0.71±0.17±0.18] Today, at the open session of the Large Hadron Collider Committee, LHCC, the LHCb collaboration presented the result of a new measurement of the ratio of branching fractions, R(J/ψ), between Bc+→J/ψτ+ντ and Bc+→J/ψμ+νμ using τ+→
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Chic12
[m(χc1) = 3510.71±0.04±0.09 MeV; m(χc2) = 3556.10±0.06±0.11 MeV] [m(χc2) – m(χc1) = 45.39±0.07±0.03 MeV] [Γ(χc2) = 2.10±0.20±0.02 MeV] Today, at the open session of the Large Hadron Collider Committee, LHCC, the LHCb collaboration presented the result of a precise mass measurements of χc1 and χc2 mesons, performed for the first time by utilising the newly
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L6fb
The LHCb collaboration has reached a symbolic milestone this morning, announcing that the experiment has recorded a luminosity of 6 fb-1 integrated over the whole period of data taking 2010-2017. In this way LHCb celebrated ”Jeûne genevois”, a public holiday in the canton of Geneva, where CERN is hosted. The shift crew captured this moment
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EPS2017
The LHCb collaboration presented new results in 32 talks given by LHCb speakers at the EPS Conference on High Energy Physics, EPS-HEP 2017, Venice, Italy. The observation of an exceptionally charming particle, the Ξcc++, was already announced in the 6 July 2017 news. A few other selected items are listed below. (1) Prompt and nonprompt
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Xicc
[ m(Ξcc++) = 3621.40±0.72±0.27±0.14 MeV/c2 ] Today, at the EPS Conference on High Energy Physics, EPS-HEP 2017, in Venice, Italy, the LHCb collaboration presented the first observation of a doubly charmed particle. This particle, called the Ξcc++, is a baryon (particle composed of three quarks) containing two charm quarks and one up quark, resulting in
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HLJ
Hélène Langevin-Joliot visited today the LHCb detector cavern during a short LHC Technical Stop (left image). She is the Emeritus Research Director in Fundamental Nuclear Physics at CNRS in Orsay (France), and is the daughter of Frédéric and Irène Joliot-Curie (Nobel laureates for Chemistry in 1935) and granddaughter of Pierre Curie (Nobel laureate for Physics
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GiCh
Giovanni Passaleva from the Istituto Nazionale di Fisica Nucleare in Firenze begins today his 3-year tenure as LHCb spokesperson. He takes over from Guy Wilkinson from the University of Oxford. Chris Parkes from the University of Manchester is the new deputy spokesperson for this period, taking over from Monica Pepe Altarelli from CERN. click the
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RDst2
Measurement of R(D*): the ratio of branching fractions between B0 → D*-τ+ντ and B0 → D*-μ+νμ using three-prong hadronic τ decays. [R(D*) in this measurement = 0.291±0.019±0.029; LHCb average = 0.310±0.016±0.022] Yesterday, at the 15th Flavor Physics and CP violation conference in Prague (Czech Republic), and today at a seminar at CERN, the LHCb collaboration
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2017DAQ
Today proton-proton collisions for physics restarted again after a 5 month “Extended Year End Technical Stop”. This traditional winter shut-down period was “extended” due to major installation work carried out in another one of the LHC detectors. The recommissioning of the accelerator has proceeded very smoothly and first collisions arrived earlier than initially expected. During