Tag: News
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Z(4430)
The LHCb Collaboration has published yesterday results of precise measurements of properties of the Z(4430)– particle which allow to determine unambiguously its exotic nature. In the traditional quark model, the strongly interacting particles (hadrons) are formed either from quark-antiquark pairs (mesons) or three quarks (baryons). Particle physicists were searching since 50 years for the particles,
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Mor2014
The LHCb Collaboration has reported new important results at the Rencontres de Moriond EW Interactions and Unified Theories, March 15th – 22nd and QCD and High Energy Interaction, March 22nd – 29th. The run 1 data taking period ended one year ago. The LHCb experiment collected 1fb-1 of data from the pp collisions at 7
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PhPol2
The LHCb Collaboration has submitted today for publication a paper reporting the first observation of photon polarisation in b→sγ transition. The full 3 fb-1 Run 1 data sample was used to obtain this result. The Collaboration has presented already the first evidence for the photon polarization in this process at the summer 2013 conferences using
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Bc
[ τ( Bc+) = 509 ± 8 ± 12 fs ] In the Standard Model of Particle Physics the strongly interacting particles (hadrons) are composed of three quarks (baryons) or quark-antiquark pairs (mesons). There are six types of quarks, three light: up (u), down (d) and strange (s) and three heavy: charm (c), beauty (b)
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LS1
The last run 1 collisions took place at LHCb on February 2013. The proton beams should traverse again LHCb in early 2015. The period in between is called Long Shutdown 1 (LS1). What is happening at LHCb, 100m underground, during this period? ”LHCb operated with great success throughout LHC run 1 and has not been
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VELO
At LHCb the protons collide inside the VErtex LOcator detector (VELO). The VELO is composed of two halves, each consisting of 21 pairs of back-to-back silicon sensors, whose job is to precisely measure the position at which the charged particles pass (see left image below). You can watch the sophisticated construction process at the video
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Dosc
[ x’2 = (5.5 ± 4.9)x10-5 ; y’ = (4.8 ± 1.0)x10-3 ] [ AΓ(KK) = (-0.35 ± 0.62 ± 0.12)x10-3 AΓ(ππ) = (0.33 ± 1.06 ± 0.14)x10-3 ] The LHCb Collaboration has reported recently new important results on charm physics. (1) Ten months ago, the LHCb Collaboration presented the first observation of the D0–D0
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Higgs
The Nobel Prize committee of the Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics for 2013 to François Englert and Peter Higgs for "the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles, and which recently was confirmed through the
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RICH
The physics results presented on this web page were obtained thanks to the excellent LHC collider performance, to the excellent LHCb data acquisition and analysis, and certainly also to the excellent quality of LHCb detector. As an example the exceptional precision of the particle identification achieved by one of the two RICH detectors is shown
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Music
A fascinating feature of quantum mechanics, in which the B0s, B0 and D0 particles turn into their antimatter partners and back, has been discussed already few times at this page, see 3 March 2013 and 7 November 2012 news. This feature is called oscillations or mixing. The B0s mesons oscillate with by far the highest