Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session H13: CP Violation |
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Sponsoring Units: DPF Chair: Alexey Garmash, Princeton University Room: Hyatt Regency Jacksonville Riverfront City Terrace 9 |
Sunday, April 15, 2007 8:30AM - 8:42AM |
H13.00001: $CP$~Violation in $B \to J/\psi X$ Modes Karen Gibson In the $B^0$~system, $CP$~violation occurs dominantly via the CKM mechanism, which produces little violation of $CP$ in the $B^0_s$ system. We report on the effort to measure the parameters: $\sin 2\beta$, which applies in the $B^0$~system (and which has already been tightly constrained at the $B$~factories), and $\sin 2\beta_s$ which applies in the $B^0_s$~system (and which is expected to be small in the absence of additional, non-CKM sources of $CP$~violation). [Preview Abstract] |
Sunday, April 15, 2007 8:42AM - 8:54AM |
H13.00002: Measurement of the $CP$ Asymmetry in Semileptonic $B$~Decays at CDF Christopher Marino We present a high-precision measurement of the inclusive $CP$ asymmetry in same sign dimuon events originating from two semileptonic $B$~hadron decays. Using a sample of 1.2~fb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}$=1.96~TeV collected by the Collider Detector at Fermilab, we select events with two identified muons. To isolate the $b\bar{b}$ signal from background sources, we take advantage of the long $B$~lifetime utilizing the impact parameters of the two muons. We correct for charge asymmetries introduced by the detector and other physics effects to extract the $CP$~asymmetry. [Preview Abstract] |
Sunday, April 15, 2007 8:54AM - 9:06AM |
H13.00003: $CP$-violating asymmetries in $B^0 \rightarrow a_1(1260)^{\pm} \pi^{\mp}$ Simone Stracka We present preliminary measurements of $CP$-violating asymmetries for $B^0 \rightarrow a_1(1260)^{\pm} \pi^{\mp}$ decays and of branching fractions for the $B^0$ decays to $K_1(1270)^+ \pi^-$ and $K_1(1400)^+ \pi^-$. The dataset consists of approximately 384 million $B\bar{B}$ pairs produced in electron-positron annihilation and recorded by the BaBar detector. [Preview Abstract] |
Sunday, April 15, 2007 9:06AM - 9:18AM |
H13.00004: Improved measurement of the $CP$ asymmetry amplitude $\sin 2\beta$ in charmonium final states at Babar Elisa Manoni We present an updated measurement of time-dependent $CP$ asymmetries in fully reconstructed neutral $B$ decays to several $CP$ eigenstates containing a charmonium meson. The measurements use a data sample of 384 million $B\bar{B}$ decays collected with the BaBar detector at the PEP-II $B$ Factory between 1999 and 2006. [Preview Abstract] |
Sunday, April 15, 2007 9:18AM - 9:30AM |
H13.00005: Aspects of the $\sin2\beta$ measurement specific to the decay mode $B^0 \to J/\psi K^0_L$ Emilie Martin We present the details of the $\sin2\beta$ measurement that are specific to the decay mode $B^0 \to J/\psi K^0_L$, using a sample of 384 million $\Upsilon(4S)\to B\bar{B}$ events, collected by the BaBar detector at the PEP-II asymmetric-energy $B$ Factory. We use several parameters for the $\sin2\beta$ fit that are unique to the $B^0 \to J/\psi K^0_L$ decay. The relative fractions for signal and various inclusive $J/\psi$ modes are input to the fit and are split by reconstruction type, $J/\psi$ lepton decay type and tagging category. We also use the parameters of the PDFs to the $\Delta E$ shapes for signal and different background distributions derived from fits to the Monte Carlo events and split by reconstruction type and $J/\psi$ lepton decay type. [Preview Abstract] |
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