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Strange B meson

strange b meson inclusive semileptonic decay, strange b meson lifetime
The
B
s meson
is a meson composed of a bottom antiquark and a strange quark Its antiparticle is the
B
s meson
, composed of a bottom quark and a strange antiquark

Contents

  • 1 B–B oscillations
  • 2 Rare decays
  • 3 See also
  • 4 References
  • 5 External links

B–B oscillations

Strange B mesons are noted for their ability to oscillate between matter and antimatter via a box-diagram with Δms = 1777 ± 010 stat ± 007 syst ps−1 measured by CDF experiment at Fermilab[1] That is, a meson composed of a bottom quark and strange antiquark, the strange
B
meson, can spontaneously change into an bottom antiquark and strange quark pair, the strange
B
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:

This first major discovery of Run 2 continues the tradition of particle physics discoveries at Fermilab, where the bottom 1977 and top 1995 quarks were discovered Surprisingly, the bizarre behavior of the B_s pronounced "B sub s" mesons is actually predicted by the Standard Model of fundamental particles and forces The discovery of this oscillatory behavior is thus another reinforcement of the Standard Model's durability

CDF physicists have previously measured the rate of the matter-antimatter transitions for the B_s meson, which consists of the heavy bottom quark bound by the strong nuclear interaction to a strange antiquark Now they have achieved the standard for a discovery in the field of particle physics, where the probability for a false observation must be proven to be less than about 5 in 10 million 5/10,000,000 For CDF's result the probability is even smaller, at 8 in 100 million 8/100,000,000[2]

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 April 24, 2013, CERN physicists in the LHCb collaboration announced that they had observed CP violation in the decay of strange
B
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 BrBs→ µ+µ−SM = 366 ± 023 × 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]

B r B s → μ + μ − = 28 − 06 + 07 × 10 − 9 \rightarrow \mu ^\mu ^=28_^\times 10^}

This result is compatible with the standard model and set limits on possible extensions

See also

  • B meson
  • Charmed B meson
  • B–
    B
    oscillation

References

  1. ^ A Abulencia et al CDF Collaboration 2006 "Observation of
    B0
    s–
    B0
    s Oscillations" Physical Review Letters 97: 242003 arXiv:hep-ex/0609040  Bibcode:2006PhRvL97x2003A doi:101103/PhysRevLett97242003 
  2. ^ a b "It might be It could be It is!!!" Press release Fermilab 25 September 2006 Retrieved 2007-12-08 
  3. ^ R Kotulak 26 September 2006 "Antimatter discovery could alter physics: Particle tracked between real world, spooky realm" Deseret News Retrieved 2007-12-08 
  4. ^ "A Taste of LHC Physics" PDF Physics World June 2008 pp 22–25 
  5. ^ "LHCb experiment observes new matter-antimatter difference" CERN Press Office 24 April 2013 Retrieved 2013-04-24 
  6. ^ R Aaij et al LHCb collaboration 2013 "First Observation of C P Violation in the Decays of B s 0 Mesons" Physical Review Letters 110 22: 221601 arXiv:13046173  Bibcode:2013PhRvL110v1601A doi:101103/PhysRevLett110221601 
  7. ^ M Hogenboom 24 July 2013 "Ultra-rare decay confirmed in LHC" BBC Retrieved 2013-08-18 
  8. ^ CMS 14 May 2015 "Mathematical explanation from GENUINE published result" Nature Retrieved 2015-05-15 
  9. ^ M Piesing 24 April 2013 "Cern physicists observe new difference between matter and antimatter" Wired UK Retrieved 2013-04-24 
  10. ^ Collaboration, C M S June 4, 2015 "Observation of the rare Bs0 →µ+µ− decay from the combined analysis of CMS and LHCb data" Nature 522 7554: 68–72 arXiv:14114413  Bibcode:2015Natur52268C doi:101038/nature14474 ISSN 0028-0836 PMID 26047778 

External links

  • V Jamieson 18 March 2008 "Flipping particle could explain missing antimatter" New Scientist Retrieved 2010-01-23 


strange b meson feynman, strange b meson inclusive semileptonic decay, strange b meson lifetime, strange b meson oscillation


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Strange B meson


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