Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session U12: Tevatron Techniques in B Physics |
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Sponsoring Units: DPF Room: Marriott Tampa Waterside Room 11 |
Monday, April 18, 2005 3:30PM - 3:54PM |
U12.00001: Multidimensional Likelihood-based Flavor Tagging at D{\O} Dan Krop, Brendan Casey We study the determination of the initial state flavor of $b$ quarks produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV recorded by the D{\O} detector operating at the Fermilab Tevatron. This is vital to the observation of $B_{s}$ mixing. A multidimensional likelihood method has been developed using kinematic properties of particles that originate from the other $b$ quark produced in events with reconstructed $B$ mesons. The performance of the tagging algorithm is determined by measuring the $B_d$ mixing frequency with a data sample of semileptonic $B$ meson decays from which dilutions and efficiencies are extracted. The method can be easily extended through the addition of other kinematic variables. [Preview Abstract] |
Monday, April 18, 2005 3:54PM - 4:06PM |
U12.00002: Flavor Tagging using electrons at the D\O\ Detector at Fermilab Md Naimuddin Flavor tagging of $B$ hadrons is crucial for the measurement of mixing in the $b$-quark sector. Using approximately $450\;\rm pb^{-1}$ of data collected with upgraded D\O\ detector in Run II of Fermilab Tevatron, we present preliminary results on $b$-flavor tagging using electrons. This is the first analysis at D\O\ that uses electrons for tagging the flavor of $b$ quarks at their production time. [Preview Abstract] |
Monday, April 18, 2005 4:06PM - 4:18PM |
U12.00003: Lifetime Measurement of fully hadronic reconstructed {\it B} collected by the dedicate I.P. based trigger Saverio Da Ronco Thanks to its i.p. based trigger, CDF is able to collect large amount of {\it B} reconstructed in hadronic decays. One of most important features of hadronic decays is that can be fully reconstructed avoiding,in this way, the dependence from K factor that is a typical issue of semileptonic decays. More over CDF has the possibility to reconstruct also $B_{s}$ mesons, that can produced in high energy collision between $p$ and $\bar{p}$, but not in $B-factories$. Anyway the sample selection performed by trigger itself, sculpts the signal lifetime distribution that could no longer be described with a convolution between exponential and Gaussian. Understanding the trigger bias and perform a lifetime measurement in these sample is a challenging analysis. We present the results of the lifetime measurement performed on this sample and the fitting techniques used to understand the trigger bias [Preview Abstract] |
Monday, April 18, 2005 4:18PM - 4:30PM |
U12.00004: Likelihood Based Opposite Side Lepton and Jet Charge Tagging Vivek Tiwari Using $p\bar p$ collision data at $\sqrt{s} = 1.96$~TeV collected with the CDF\,II experiment at the Fermilab Tevatron collider, we study opposite side $B$~flavour tagging using leptons and jets. Various identification quantities for leptons and kinematic properties of jets are combined using likelihood and neural network techniques to find interaction products associated with opposite side B mesons. Using a data sample enriched in semileptonic $B \rightarrow \ell \nu X$ decays, the performance of the opposite side lepton and jet charge tagging algorithms is studied and the effective tagging efficiency $\epsilon D2$ determined. [Preview Abstract] |
Monday, April 18, 2005 4:30PM - 4:42PM |
U12.00005: Use of particle ID in reconstructing hadronic B decays at CDF Paola Squillacioti The CDF II detector provides two means of particle identification: dE/dx for charged tracks passing through the central outer tracker (COT), and particle time-of-flight (TOF) measured with by a system of 216 scintillating bars surrounding the outer radius of the COT. The two measurements are complementary. The TOF system is most effective for low transverse momentum tracks ($p_T<2$~GeV/c) and dE/dx is most effective for intermediate transverse momenta ($p_T>2$~GeV/c). By combining information in a single optimized quantity, a pi/k separation at least 1.5 sigma is obtained for track momenta up to 5 GeV, with larger values in the lower momentum range. The applications of this PID algorithm at CDF helps the extraction of clean hadronic B signals, disentangling the contribution of reflections and allows determination of particle composition of track samples. [Preview Abstract] |
Monday, April 18, 2005 4:42PM - 4:54PM |
U12.00006: B Fragmentation and Same Side Kaon Tagger Pierluigi Catastini Using $p\bar p$ collision data at $\sqrt{s} = 1.96$~TeV collected with the CDF\,II experiment at the Fermilab we study fragmentation of $b$ quarks. We measure multiplicities and relative fractions of K, pi, p particles in the vicinity of partially reconstructed semileptonic decays of B0, B+ and Bs. We then apply this knowledge and Monte Carlo techniques to develop B flavor tagging method based on kaons identified near the signal B candidates using the Time-of-Flight and dE/dX measurements of charged tracks. The effective tagging efficiency of the SSKT is predicted for Bs events. The application and impact of SSKT on Bs mixing measirement is discussed. [Preview Abstract] |
Monday, April 18, 2005 4:54PM - 5:06PM |
U12.00007: Opposide side B--flavour tagging using combined TOF and dEdx particle identification technique Giuseppe Salamanna The application of a combined TOF plus dE/dx particle identification technique to opposite side B--flavour tagging is described. A preliminary measurement of the effective tagging efficiency using an inclusive semileptonic B decay data sample is given. [Preview Abstract] |
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