scholarly journals Experimental Study of the Rare Neutral-Kaon Decays at J-PARC: Final Technical Report

2019 ◽  
Author(s):  
Yau Wai Wah



2019 ◽  
Vol 55 (11) ◽  
Author(s):  
C. S. Akondi ◽  
K. Bantawa ◽  
D. M. Manley ◽  
S. Abt ◽  
P. Achenbach ◽  
...  

Abstract.This work measured $ \mathrm{d}\sigma/\mathrm{d}\Omega$dσ/dΩ for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the $ \gamma p\rightarrow K^0\Sigma^+$γp→K0Σ+, $ \gamma n\rightarrow K^0\Lambda$γn→K0Λ, and $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 reactions. Our results for $ \gamma n\rightarrow K^0 \Sigma^0$γn→K0Σ0 are the first-ever measurements for that reaction. These data will provide insight into the properties of $ N^{\ast}$N* resonances and, in particular, will lead to an improved knowledge about those states that couple only weakly to the $ \pi N$πN channel. Integrated cross sections were extracted by fitting the differential cross sections for each reaction as a series of Legendre polynomials and our results are compared with prior experimental results and theoretical predictions.



An analysis is made o f the limits on the possible departures from CP -, T -, and TCP -invariance, both in the structure of K L and K S states and in the decay amplitudes to xx and xIv channels. A small violation of the requirements of CP - and T -invariance on the structure of K L and K S states can be deduced under quite plausible assumptions, but there is no evidence of any other departure from the requirements of CP -, or T -, or TCP -in variance. However, the present limit for one measure 8 of TCP -noninvariance is several times larger than the estim ated value of the corresponding CP - and T -noninvariance parameter or = Re<K L |K S >. Taking a conservative view of the experimental data, symmetry-violating parts of decay amplitudes are lim ited to better than 1 % for the I = 0 channel and to within a small percentage for the I = 2 channel, in relative magnitude. The corresponding limits which can be deduced for leptonic decay amplitudes are som ewhat larger but there are indications that symmetry-violating amplitudes are unlikely to exceed a small percentage in relative magnitude.



1993 ◽  
Vol 70 (17) ◽  
pp. 2529-2532 ◽  
Author(s):  
E. J. Ramberg ◽  
G. J. Bock ◽  
R. Coleman ◽  
J. Enagonio ◽  
Y. B. Hsiung ◽  
...  


1994 ◽  
Vol 36 ◽  
pp. 287-291
Author(s):  
B. Aubert


1970 ◽  
Vol 2 (1) ◽  
pp. 179-200 ◽  
Author(s):  
B. R. Martin ◽  
E. de Rafael ◽  
J. Smith


2005 ◽  
Vol 20 (02n03) ◽  
pp. 493-502
Author(s):  
◽  
GAIA LANFRANCHI

Recent results obtained by the KLOE experiment operating at DAΦNE, the Frascati ϕ-factory, are presented. They mainly concern neutral kaon decays including rare KS decays, KL lifetime, the radiative ϕ→f0γ decay and the measurement of the e+e- hadronic cross section using initial state radiation.



Pramana ◽  
2004 ◽  
Vol 62 (3) ◽  
pp. 601-606
Author(s):  
Wojciech Wiślicki ◽  


1972 ◽  
Vol 6 (11) ◽  
pp. 3326-3329
Author(s):  
G. V. Dass ◽  
P. K. Kabir
Keyword(s):  


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