Papers by Fabian Leimgruber
Pion correlations and resonance effects in ${\rm \bar{p}p}$ annihilation at rest to $2\pi^+2\pi^-\pi^0$
The European Physical Journal C, 1999
Pion correlations and resonance effects in annihilation at rest to 2π+ 2π-π 0
CP, T, and CPT tests in neutral Kaon decays using tagged K0, K0at LEAR
AIP Conference Proceedings, 1995
The CPLEAR experiment at CERN measures particle‐antiparticle asymmetries of strangeness‐tagged K,... more The CPLEAR experiment at CERN measures particle‐antiparticle asymmetries of strangeness‐tagged K, K decays to two‐pion, three‐pion, and semileptonic final states. The technique of CPLEAR is an alternative approach to previous CP‐violation studies. It ...
Zeitschrift f�r Physik C Particles and Fields, 1996
CP violation has been observed as a time-dependent rate asymmetry between the decays K 0 0 0 and ... more CP violation has been observed as a time-dependent rate asymmetry between the decays K 0 0 0 and K 0 0 0 , where the neutral kaons are produced with denite and individually known strangeness in pp K 0 K + or pp K 0 K +. A special technique for the data analysis has been developed. The values obtained for 00 and j 00 j are in agreement with those of previous measurements of CP violation.
Physics Letters B, 1995
We use ts to recent published CPLEAR data on neutral kaon decays to + and e to constrain the CPT{... more We use ts to recent published CPLEAR data on neutral kaon decays to + and e to constrain the CPT{violation parameters appearing in a formulation of the neutral kaon system as an open quantum-mechanical system. The obtained upper limits of the CPT{violation parameters are approaching the range suggested by certain ideas concerning quantum gravity.
A determination of the CPT violation parameter Re(δ)from the semileptonic decay of strangeness-tagged neutral kaons
Physics Letters B, 1998
Determination of the T- and CPT-violation parameters in the neutral-kaon system using the Bell–Steinberger relation and data from CPLEAR
Physics Letters B, 1999
Measurement ofCP violation parameters and test ofCPT invariance with $$\overline {K^0 } $$ and K0 at LEARand K0 at LEAR
Il Nuovo Cimento A, 1996
... 5), W. FETSCHER (17), M. FIDECARO (4), A. FILIPCIC (10) D. FRANCIS (3), j. FRY (9), E. GABATH... more ... 5), W. FETSCHER (17), M. FIDECARO (4), A. FILIPCIC (10) D. FRANCIS (3), j. FRY (9), E. GABATHULER (9), R. GAMET (9), D. GARRETA (14) H.- J. GERBER (17), A. GO (15), C. GUYOT (14), A. HASELDEN (9), pj HAYMAN (9) F ... (8) Am = (0.5274 + 0.0029star + 0.0005~ 9 9 ...
The interference between CP-conserving $\ks$ and $\kl \rightarrow \threepi$ decay amplitudes was ... more The interference between CP-conserving $\ks$ and $\kl \rightarrow \threepi$ decay amplitudes was observed by studying the decay rate asymmetries between initial $\ko$ and $\kob$ separately for the phase space regions $E_{\mbox{\rm \scriptsize CM}}(\pi^+)> E_{\mbox{\rm \scriptsize CM}}(\pi^-)$ and $E_{\mbox{\rm \scriptsize CM}}(\pi^+)< E_{\mbox{\rm \scriptsize CM}}(\pi^-)$. For the parameter $\lambda$ we found $\mbox{\rm Re}(\lambda )=0.036\pm0.010(\mbox{\rm stat.}) ^{+0.002}_{-0.003} (\mbox{\rm syst.)}$ and $\mbox{Im}(\lambda)$ consistent with
Physics at CPLEAR
Physics Reports, 2003
Physics Letters B, 1996
The best estimation of (p+-(the phase of the CP violation parameter v+-) and of Am (the KL-Ks mas... more The best estimation of (p+-(the phase of the CP violation parameter v+-) and of Am (the KL-Ks mass difference) is obtained by averaging the results of different experiments, taking into account the different correlation, existing for most of the experiments, between the measurement of p+-and Am. Including the recent measurements, we obtain the average values (Am) = (530.7 41 1.3) x lO'fi/s and (v+-) = 43.82" f 0.63". This value of rp+-is in good agreement with the superweak phase (psw = 43.49' f 0.08'.
First direct observation of time-reversal non-invariance in the neutral-kaon system
Physics Letters B, 1998
A determination of the CP violation parameter η+− from the decay of strangeness-tagged neutral kaons
Physics Letters B, 1999
Physics Letters B, 1998
The CPLEAR experiment measured the eigentime-dependent asymmetry in the rates of initially tagged... more The CPLEAR experiment measured the eigentime-dependent asymmetry in the rates of initially tagged K 0 and K 0 decaying to 0 0 0 in order to study the interference between the CP-violating K S and the CP-conserving K L decay amplitudes. Without assuming CPT invariance, we obtain for the CP-violation parameter 000 the values Re 000 = 0 : 180:14 stat. 0:06 syst. and Im 000 = 0 : 150:20 stat. 0:03 syst. : Requiring Re 000 to be equal to Re we obtain Im 000 = 0:05 0:12 stat. 0:05 syst. : The corresponding upper limit for the branching ratio of the K S ! 0 0 0 decay is deduced to be B K S ! 0 0 0 < 1:9 10 5 at the 90% confidence level.
Physics Letters B, 1996
Leimgruber 2) , A. Liolios 16) , E. Machado 5) , P. Maley 9) , I. Mandi c 10) , N. Manthos 8) , G... more Leimgruber 2) , A. Liolios 16) , E. Machado 5) , P. Maley 9) , I. Mandi c 10) , N. Manthos 8) , G. Marel 14) , M. Miku z 10) , J. Miller 3) , F. Montanet 11) , T. N a k ada 13) , A. Onofre 5) , B. P agels 17) , I. Papadopoulos 16) , P. P a vlopoulos 2) , F. P elucchi 11) , J. P i n to da Cunha 5) , A. P olicarpo 5) , G. Polivka 2) , H. P ostma 6) , R. Rickenbach 2) , B.L. Roberts 3) , E. Rozaki 1) , T. R u f 4) , L. Sacks 9) , L. S a k eliou 1) , P. Sanders 9) , C. Santoni 2) , K. Sarigiannis 1) , M. S c h afer 17) , L.A. Schaller 7) , T. S c hietinger 2) , A. S c hopper 4) , P. S c h une 14) , A. Soares 14) , L. T auscher 2) , C. Thibault 12) , F. T ouchard 11) , C. T ouramanis 4) , F. T riantis 8) , D.A. Tr oster 2) , E. V an Beveren 5) , C.W.E. Van Eijk 6) , G. V arner 3) , S. Vlachos 2) , P. W eber 17) , O. Wigger 13) , C. Witzig 17) , M. W olter 17) , C. Y eche 14) , D. Z a vrtanik 10) and D. Zimmerman 3) .
Measurement of the neutral kaon regeneration amplitude in carbon at momenta below 1 Gev/c
Physics Letters B, 1997
Measurement of the KL-KS mass difference using semileptonic decays of tagged neutral kaons
Physics Letters B, 1995
Measurement of the CP violation parameter η+− using tagged K0 and 0
Physics Letters B, 1995
Results of CPLEAR
Nuclear Physics B - Proceedings Supplements, 1997
The CPLEAR experiment uses tagged K0 and K0 produced in pp annihilation at rest to measure CP-, T... more The CPLEAR experiment uses tagged K0 and K0 produced in pp annihilation at rest to measure CP-, T- and CPT-violation parameters in the neutral kaon system. The results of these measurements and some implications are reported.
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Papers by Fabian Leimgruber