Track finding efficiency in BABAR Allmendinger, T.; Bhuyan, B.; Brown, D.N. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2013, Letnik:
704
Journal Article
Recenzirano
We describe several studies to measure the charged track reconstruction efficiency and asymmetry of the BABAR detector. The first two studies measure the tracking efficiency of a charged particle ...using τ and initial state radiation decays. The third uses the τ decays to study the asymmetry in tracking, the fourth measures the tracking efficiency for low momentum tracks, and the last measures the reconstruction efficiency of KS0 particles. The first section also examines the stability of the measurements vs. BABAR running periods.
Using data from the FOCUS (E831) experiment, we have searched for T violation in charm meson decays using the four-body decay channels D0→K−K+π−π+, D+→KS0K+π−π+, and Ds+→KS0K+π−π+. The T violation ...asymmetry is obtained using triple-product correlations and assuming the validity of the CPT theorem. We find the asymmetry values to be ATviol(D0)=0.010±0.057(stat.)±0.037(syst.), ATviol(D+)=0.023±0.062(stat.)±0.022(syst.), and ATviol(Ds+)=−0.036±0.067(stat.)±0.023(syst.). Each measurement is consistent with no T violation. New measurements of the CP asymmetries for some of these decay modes are also presented.
We review genetic programming principles, their application to FOCUS data samples, and use the method to study the doubly Cabibbo suppressed decay
D
+
→
K
+
π
+
π
-
relative to its Cabibbo favored ...counterpart,
D
+
→
K
-
π
+
π
+
. We find that this technique is able to improve upon more traditional analysis methods. To our knowledge, this is the first application of the genetic programming technique to High Energy Physics data.
Track finding efficiency in B A B AR Allmendinger, T.; Bhuyan, B.; Brown, D.N. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2013, Letnik:
704
Journal Article
We present a search for a charmed pentaquark decaying strongly to D(∗)−p. Finding no evidence for such a state, we set limits on the cross-section times branching ratio relative to D∗− and D− under ...particular assumptions about the production mechanism.
Using data collected by the high energy photoproduction experiment FOCUS at Fermilab we study the doubly and singly Cabibbo suppressed decays
D
+
and
D
s
+
→
K
+
π
+
π
−
. Our measurements of
Γ
(
D
+
...→
K
+
π
+
π
−
)
/
Γ
(
D
+
→
K
−
π
+
π
+
)
=
0.0065
±
0.0008
±
0.0004
and
Γ
(
D
s
+
→
K
+
π
+
π
−
)
/
Γ
(
D
s
+
→
K
+
K
−
π
+
)
=
0.127
±
0.007
±
0.014
are based on samples of
189
±
24
D
+
and
567
±
31
D
s
+
reconstructed events, respectively. We also present Dalitz plot analyses of the two decay channels; the amplitude analysis of the
D
s
+
→
K
+
π
+
π
−
mode is performed for the first time.
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