is b s 0 production by neutrino interactions interesting? presented at the super-b factory workshop...
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![Page 1: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/1.jpg)
Is Bs0 production by neutrino
interactions interesting?
Presented at the Super-B factory
workshop as an alternative approach
Nickolas Solomey
21 April 2005
![Page 2: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/2.jpg)
Important because:• s-quark and b-quark
combination is calculable.
• CP violation is experimentally possible.
Physics Interest:• A golden mode to
study is Bs0 and Bs
0
– e+e- colliders produce it through ’’’’’
– hadronic production has poor tagging of what was produced.
– but
Production by neutrino has a possible advantage, but bringing its own difficulties.
![Page 3: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/3.jpg)
Diagram:
proton
or
neutron
or e
qq pair
s-quark
or e
baryon
sq meson
u
![Page 4: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/4.jpg)
Allowed processes:
p K+ p lepton 0.6 studied
n K0 p lepton 0.6 Can be used to test idea
n Ds
c+ + lepton 3.7 Maybe interesting
n Bs0
b0 + lepton 10.3 Study CP violation
Reaction
Threshold
[GeV]
Charged-current s=1 reactions, produce
states containing a single strange meson.
![Page 5: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/5.jpg)
Allowed processes:
p K+ p lepton 0.6 studied
n K0 p lepton 0.6 Can be used to test idea
n Ds
c+ + lepton 3.7 Maybe interesting
n Bs0
b0 + lepton 10.3 Study CP violation
Reaction
Threshold
[GeV]
But a qq pair such as bb or cc can be produced at
higher threshold.
![Page 6: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/6.jpg)
Allowed processes:
p K+ p lepton 0.6 studied
n K0 p lepton 0.6 Can be used to test idea
n Ds
c+ + lepton 3.7 Maybe interesting
n Bs0
b0 + lepton 10.3 Study CP violation
Reaction
Threshold
[GeV]
Possible future experiment at
Fermilab aims to study this
The s=q selection rule is enforced, so s-quarks
mesons are the only thing allowed with neutrinos.
![Page 7: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/7.jpg)
Antiparticle produced only byassociate production:
p K+ 0 0 p lepton -
n Bs0
b+ lepton +
Reaction
•The s=q rule is very powerful.
•Neutrino and charged lepton used only as a tag, but it is 100%.
•The neutrino used, i.e. electron type or muon type, does not matter.
![Page 8: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/8.jpg)
Analysis approach:
• Lepton charge and type of neutrino beam 100% tags if Bs
0 produced.
• Lepton track gives location of production.
• Bs0 or Bs
0 seen at decay point where:
– decay identifies what it decayed as Bs0 or Bs
0
– momentum of decay products gives momentum of Bs
0 to correct for c flight path.
• A b-Baryon confirms bb process.
![Page 9: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/9.jpg)
Experimental needs:• Vertex detector of emulsion or layers of
silicon-tracking detectors.• Charged lepton identification of charge. • Decay products:
– Good momentum reconstruction to get invariant masses and flight path correction.
– Exceptional particle identification.
• The higher the neutrino beam energy the better since this will give a longer flight path in the lab-frame. (advantage of Beta beams)
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Accelerator:• Neutrino Factory with
muons, very costly, long term 25+ years away.
• Modified Fermilab Tevatron with Radioactive heavy ion beams. Argonne Lab may be resource if they get the new RIA.
• Brookhaven National Laboratory has lots of experience with heavy ions in RHIC, since this experiment does not need a far detector the modification of the RHIC tunnel could be considered.
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-Beam ring layout:
![Page 12: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/12.jpg)
Problems:
• The neutrino rates would have to be high, but this is compatible with the needs of a far detector in the neutrino experiments.
• The near experiment would have to be of a high precision for both reconstructing decays and identifying particles.
![Page 13: Is B s 0 production by neutrino interactions interesting? Presented at the Super-B factory workshop as an alternative approach Nickolas Solomey 21 April](https://reader035.vdocuments.site/reader035/viewer/2022062421/56649d385503460f94a10d5e/html5/thumbnails/13.jpg)
Conclusion:• A future USA neutrino program may have:
– Detailed oscillation parameters measured.– CP violation search in Section.– Can b-quark physics be done?
• A -neutrino factory may be very far off in the future, but a beta beam by radioactive heavy ions is possibility.
• Take full advantage of other physics that can be done such as study of Bs
0
– has advantage of 100% tagged at production.– what are the rates?