Semileptonic decays of charmed and beauty baryons with sterile neutrinos in the final state

1
Semileptonic decays of charmed and beauty baryons
with sterile neutrinos in the final state
2
(No Transcript)
3
Decays of mesons and baryons that give the
biggest contribution to production of sterile
neutrinos

• Decays of mesons
• 1) Ds ? l N
• 2) D ? K l N
• 3) B ? D l N

• Decays of baryons
• 1) ?c ? ? l N
• 2) ?b ? ?c l N

4
Matrix element
5
Branching ratio Br as the function of sterile
neutrino mass MN
?c? ? l N
MN, GeV
6
Branching ratio Br as the function of sterile
neutrino mass MN
?b??c l N
MN, GeV
7
Differential branching ratios
over the outgoing baryon energy E?
?c? ? l N
E?, GeV
8
Differential branching ratios
over the outgoing baryon energy E?c
?b? ?c l N
E?c, GeV
9
Differential branching ratios
over charged lepton energy El
?c? ? l N
El, GeV
10
Differential branching ratios
over charged lepton energy El
?b? ?c l N
El, GeV
11
Differential branching ratios
over charged lepton energy EN
?c? ? l N
EN, GeV
12
over charged lepton energy EN
Differential branching ratios
?b? ?c l N
EN, GeV
13
Comparing of branching ratios
14
Constrains on mixing angles
at sterile neutrino masses ranging within 2 lt MN
lt 3 GeV (PRS collaboration), but these constrains
seem to be very weak. Accordingly to the results
of NuTeV collaboration
if
GeV