scholarly journals Determination of the Michel parameters ρ, ξ, and δ in τ-lepton decays with τ→ρν tags

1998 ◽  
Vol 431 (1-2) ◽  
pp. 179-187 ◽  
Author(s):  
H. Albrecht ◽  
T. Hamacher ◽  
R.P. Hofmann ◽  
T. Kirchhoff ◽  
R. Mankel ◽  
...  
Keyword(s):  
Lepton Decays ◽  
Michel Parameters

scholarly journals Determination of the Michel parameters and the τ neutrino helicity in τ decay

1997 ◽  
Vol 56 (9) ◽  
pp. 5320-5329 ◽  
Author(s):  
J. P. Alexander ◽  
C. Bebek ◽  
B. E. Berger ◽  
K. Berkelman ◽  
K. Bloom ◽  
...  
Keyword(s):  
Michel Parameters

A determination of two Michel parameters in purely leptonic tau decays

1993 ◽  
Vol 316 (4) ◽  
pp. 608-614 ◽  
Author(s):  
H. Albrecht ◽  
H. Ehrlichmann ◽  
T. Hamacher ◽  
R.P. Hofmann ◽  
A. Kirchhoff ◽  
...  
Keyword(s):  
Tau Decays ◽  
Michel Parameters

Determination of the Michel parameters ξ and δ in leptonic τ decays

1995 ◽  
Vol 349 (4) ◽  
pp. 576-584 ◽  
Author(s):  
H. Albrecht ◽  
T. Hamacher ◽  
R.P. Hofmann ◽  
T. Kirchhoff ◽  
R. Mankel ◽  
...  
Keyword(s):  
Michel Parameters

A STUDY OF THE LORENTZ STRUCTURE IN τ DECAYS IN DELPHI

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 551-554
Author(s):  
◽  
G. Gómez-Ceballos
Keyword(s):  
Charged Current ◽  
Tensor Coupling ◽  
Lorentz Structure ◽  
Lepton Decays ◽  
Michel Parameters

A measurement of the Michel parameters, η, ρ, ξ, ξδ, and the average ντ helicity, hντ, in τ lepton decays is described together with the first measurement of the tensor coupling in the weak charged current. The results are consistent with the V - A structure of the weak charged current in decays of the τ lepton.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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