0 Ju n 20 02 Stroboscopic Variation Measurement

v 1 2 8 Fe b 20 02 Stroboscopic Variation Measurement

A new procedure of the linear position measurement which allows to obtain sensitivity better than the Standard Quantum Limit and close to the Energetic Quantum Limit is proposed and analyzed in details. Proposed method is based on the principles of stroboscopic quantum measurement and variation quantum measurement and allows to avoid main disadvantages of both these procedures. This method can ...

ar X iv : h ep - p h / 02 06 17 1 v 2 2 4 Ju n 20 02 IPHE 2002 - 009 June 24 , 2002 B 0 – B 0 MIXING

ar X iv : h ep - p h / 02 06 27 0 v 1 2 6 Ju n 20 02 1 The charge asymmetry from Pomeron - Odderon interference in hard

x / 02 06 06 9 v 1 2 7 Ju n 20 02 A new measurement of the Ξ 0 c lifetime

Using data collected by the Fermilab experiment FOCUS, we measure the lifetime of the charmed baryon Ξc using the decay channels Ξ o c → Ξ π and Ξc → Ω K. From a combined sample of 110 ± 17 events we find τ(Ξc) = 118 +14 − 12 ± 5 fs, where the first and second errors are statistical and systematic, respectively.

ar X iv : h ep - p h / 02 06 28 1 v 1 2 7 Ju n 20 02 IMSc - 2002 / 06 / 13 Penguin Pollution in B 0 d → ππ 1

A principal decay mode considered for the measurement of the angle α, is B d(t) → ππ. Unfortunately, this mode suffers from a well-known problem: penguin contributions may be large [2], and their presence will spoil the clean extraction of α. In the presence of penguin amplitudes, the CP asymmetry in B d(t) → ππ does not measure sin 2α, but rather some effective (“polluted”) angle 2αeff . We ma...