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Muon decay: measurement of the transverse polarization of the decay positrons and its implications for the fermi coupling constant and time reversal invariance | | N Danneberg
; W Fetscher
; K-U Köhler
; J Lang
; T Schweizer
; A von Allmen
; K Bodek
; L Jarczyk
; S Kistryn
; J Smyrski
; A Strza?kowski
; J Zejma
; K Kirch
; A Kozela
; E Stephan
; | | Date: |
21 Jan 2005 | | Journal: | Phys Rev Lett, 94 (2), 021802 | | Abstract: | The two transverse polarization components P(T1) and P(T2) of the e(+) from the decay of polarized mu(+) have been measured as a function of the e(+) energy. Their energy averaged values are P(T1)=(6.3+/-7.7+/-3.4) x 10(-3) and P(T2)=(-3.7+/-7.7+/-3.4) x 10(-3). From the energy dependence of P(T1) and P(T2) the decay parameters eta,eta(’’) and alpha(’)/A,beta(’)/A are derived, respectively. Assuming only one additional coupling besides the dominant V-A interaction one gets improved limits on eta, beta(’)/A, and the scalar coupling constant g(S)(RR): eta=(-2.1+/-7.0+/-1.0) x 10(-3), beta(’)/A=(-1.3+/-3.5+/-0.6) x 10(-3), Re{g(S)(RR)}=(-4.2+/-14.0+/-2.0) x 10(-3), and Im{g(S)(RR)}=(5.2+/-14.0+/-2.4) x 10(-3). | | Source: | PubMed, pmid15698163 | | Services: | Forum | Review | Favorites | |
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