LSND, SN1987A, and CPT violation - INSPIRE

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LSND, SN1987A, and CPT violation

Hitoshi Murayama
(
- LBL, Berkeley and
- UC, Berkeley
)
,
T. Yanagida
(
- Tokyo U. and
- Tokyo U., RESCEU
)

Oct, 2000

4 pages

Published in:

Phys.Lett.B 520 (2001) 263-268

e-Print:

hep-ph/0010178 [hep-ph]

DOI:

10.1016/S0370-2693(01)01136-4

Report number:

UCB-PTH-00-36,
LBNL-46955

View in:

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Abstract:

We point out that neutrino events observed at Kamiokande and IMB from SN1987A disfavor the neutrino oscillation parameters preferred by the LSND experiment. For

\Delta m^2 > 0

(the light side), the electron neutrinos from the neutronization burst would be lost, while the first event at Kamiokande is quite likely to be due to an electron neutrino. For

\Delta m^2 < 0

(the dark side), the average energy of the dominantly

\bar{\nu}_e

events is already lower than the theoretical expectations, which would get aggravated by a complete conversion from

\bar{\nu}_\mu

to

\bar{\nu}_e

. If taken seriously, the LSND data are disfavored independent of the existence of a sterile neutrino. A possible remedy is CPT violation, which allows different mass spectra for neutrinos and anti-neutrinos and hence can accommodate atmospheric, solar and LSND data without a sterile neutrino. If this is the case, Mini-BooNE must run in

\bar{\nu}

rather than the planned

\nu

mode to test the LSND signal. We speculate on a possible origin of CPT violation.

astrophysics: supernova
neutrino: cosmic radiation
neutrino: particle source
neutrino: oscillation
resonance: oscillation
violation: CPT
neutrino: solar
neutrino: mass spectrum
antineutrino: mass spectrum
geometry: noncommutative

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Figures(0)

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