Observation of B(s)0 - anti-B(s)0 oscillations and measurement of Delta m(s) in CDF Page: 4 of 4
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0 005 01 015 02 025 03 035
Decay Time Modulo 2/Am, [ps]
Fig. 4. The B -B2 oscillation signal (only hadronic
decays) measured in five bins of proper decay time
modulo the measured oscillation period 27r/Ams.
The curve shown is a cosine with an amplitude of
1.28, which is the observed value in the amplitude
scan for the hadronic sample at Ams = 17.77 ps-1.
e ~ e
0 20.'V7 pmN
a 1- hadroni ---- - ---- - 1--0
o s 10 15 20 25 o 0 s 10 15 20 A n o
Am, [ps ] Im s
Fig. 3. The measured amplitude values and uncer-
tainties versus the B2-B5 oscillation frequency Ams.
(Upper Left) Semileptonic decays only. (Lower Left)
Hadronic decays only. (Upper Right) All decay
modes combined. (Lower Right) The logarithm of
the ratio of likelihoods for amplitude equal to one
and amplitude equal to zero versus the oscillation
nal using A _ log[Gl=O/GA (Ams)], which
is the logarithm of the ratio of likelihoods
for the hypothesis of oscillations (A 1)
at the probe value and the hypothesis that
A 0, which is equivalent to random pro-
duction flavor tags. Figure 3 shows A as a
function of Am8. Separate curves are shown
for the semileptonic data alone (dashed), the
hadronic data alone (light solid), and the
combined data (dark solid). At the mini-
mum Am8 17.77 ps-1, A -17.26. The
significance of the signal is the probability
that randomly tagged data would produce a
value of A lower than -17.26 at any value of
Am8. We repeat the likelihood scan 350 mil-
lion times with random tagging decisions; 28
of these scans have A < -17.26, correspond-
ing to a probability of 8 x 10-8 (5.4 -), well
below 5.7 x 10- (5 a).
To measure Am8, we fix A 1 and fit
for the oscillation frequency. We find Am8
17.77 0.10 Statt) 0.07 (syst) psa.
The only non-negligible systematic un-
certainty on Am8 is from the uncertainty on
the absolute scale of the decay-time measure-
The B5B oscillations are depicted in
Fig. 4 where candidates in the hadronic sam-
ple are collected in five bins of proper decay
time modulo the measured oscillation period
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Giagu, S. & /Rome U. /INFN, Rome. Observation of B(s)0 - anti-B(s)0 oscillations and measurement of Delta m(s) in CDF, article, October 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc886123/m1/4/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.