Strange B meson
Template:Short description Script error: No such module "Unsubst".
Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters". The Template:Subatomic particle meson is a meson composed of a bottom antiquark and a strange quark. Its antiparticle is the Template:Subatomic particle meson, composed of a bottom quark and a strange antiquark.
B–B oscillations
Strange B mesons are noted for their ability to oscillate between matter and antimatter via a box-diagram with Δms = 17.77 ± 0.10 (stat) ± 0.07 (syst) ps−1 measured by CDF experiment at Fermilab.[1] That is, a meson composed of a bottom quark and strange antiquark, the strange Template:Subatomic particle meson, can spontaneously change into an bottom antiquark and strange quark pair, the strange Template:Subatomic particle meson, and vice versa.
On 25 September 2006, Fermilab announced that they had claimed discovery of previously-only-theorized Bs meson oscillation.[2] According to Fermilab's press release:
Ronald Kotulak, writing for the Chicago Tribune, called the particle "bizarre" and stated that the meson "may open the door to a new era of physics" with its proven interactions with the "spooky realm of antimatter".[3]
Better understanding of the meson is one of the main objectives of the LHCb experiment conducted at the Large Hadron Collider.[4] On 24 April 2013, CERN physicists in the LHCb collaboration announced that they had observed CP violation in the decay of strange Template:Subatomic particle mesons for the first time.[5][6] Scientists found the Bs meson decaying into two muons for the first time, with Large Hadron Collider experiments casting doubt on the scientific theory of supersymmetry.[7][8]
CERN physicist Tara Shears described the CP violation observations as "verification of the validity of the Standard Model of physics".[9]
Rare decays
The rare decays of the Bs meson are an important test of the Standard Model. The branching fraction of the strange b-meson to a pair of muons is very precisely predicted with a value of Br(Bs→ μ+μ−)SM = (3.66 ± 0.23) × 10−9. Any variation from this rate would indicate possible physics beyond the Standard Model, such as supersymmetry. The first definitive measurement was made from a combination of LHCb and CMS experiment data:[10]
This result is compatible with the Standard Model and set limits on possible extensions.
See also
- B meson
- [[B–Bbar oscillation|B–Template:Subatomic particle oscillation]]
References
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External links
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