Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session Y12: Flavor Physics: Charm and Bottom |
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Sponsoring Units: DPF Room: 100 |
Tuesday, April 8, 2014 1:30PM - 1:42PM |
Y12.00001: Measurement of beauty hadron spectroscopy and productions at CMS Reddy Pratap Gandrajula The large production cross-sections at LHC energies, combined with a adapted trigger strategy and good detector resolutions, has enabled CMS to collect large data samples and to perform detailed studies of Beauty hadron properties. In this talk we will report our latest results, including decay rate measurements from B hadrons and spectroscopy. [Preview Abstract] |
Tuesday, April 8, 2014 1:42PM - 1:54PM |
Y12.00002: Measurement of double J/psi productions with the CMS detector Grant V. Riley, Andrew York We present the measurement of the cross section for the simultaneous production of two J/psi mesons in proton-proton collisions with the CMS detector. The two J/psi mesons are fully reconstructed in the mu$+$mu- decay and the signal yield is extracted with an extended maximum likelihood fit. The differential cross section is measured in bins of the double J/psi invariant mass, the absolute difference in rapidity of the two J/psi mesons, and the transverse momentum of the double J/psi system. The results can provide the inputs for QCD calculations and for the constraints on the contribution of double-parton scattering. [Preview Abstract] |
Tuesday, April 8, 2014 1:54PM - 2:06PM |
Y12.00003: Search for $B^{0}\rightarrow l^{+}l^{-}$ at Belle Kimberly Williams The decay modes $B^{0}\rightarrow l^{+}l^{-}$ where $l$ is either an electron of a muon are a group of very rare particle decays presenting an important test of physics beyond the Standard Model. SM predictions for the branching ratios are vanishingly small. So, observation of such decays would be a clear signal of new physics such as extra Higgs doublets (for $B \to e^+ e^-$ or $B \to \mu^+ \mu^-$) or lepton-nonconserving interactions (for $B \to e^\pm \mu^\pm$). Based on a sample of $ (771.581\pm 10.566) \times 10^6 $ $B\bar B$ pairs collected by the Belle experiment at $\sqrt{s} = 10.58 GeV$, we present a study of the rare decay $B^{0}\rightarrow l^{+}l^{-}$. [Preview Abstract] |
Tuesday, April 8, 2014 2:06PM - 2:18PM |
Y12.00004: Update on $e^+e^-\to\pi^+\pi^-\psi(2S)$ via Initial State Radiation at Belle XiaoLong Wang Using the $980~\rm fb^{-1}$ full data sample taken with the Belle detector, the cross section of $e^+e^-\to \pi^+\pi^-\psi(2S)$ between 4.0 and 5.5~$\rm GeV$ is measured via initial state radiation. The properties of the $Y(4360)$ and $Y(4660)$ are updated. Fitting the mass spectrum of $e^+e^- \to \pi^+\pi^-\psi(2S)$ with two coherent Breit-Wigner functions yields two equivalent solutions with either constructive or destructive interference. We also search for a possible charged charmoniumlike structure in the $\pi^{\pm} \psi(2S)$ intermediate state. [Preview Abstract] |
Tuesday, April 8, 2014 2:18PM - 2:30PM |
Y12.00005: Study of $B^\pm \to \pi^\pm \pi^\mp \pi^\pm$ at Belle Yao Li Decays of B mesons to three-body charmless final states probe the properties of the weak interaction through their dependence on the complex quark couplings in the CKM matrix. They also test dynamical models for hadronic B decays. Based on a sample of $ (771.581\pm 10.566) \times 10^6 $ $B\bar B$ pairs collected by the Belle experiment at $\sqrt{s} = 10.58 GeV$, we present a study of direct CP nonconservation in $B^\pm \to \pi^\pm \pi^\mp \pi^\pm$. [Preview Abstract] |
Tuesday, April 8, 2014 2:30PM - 2:42PM |
Y12.00006: A New Family with a Fourth Lepton Flavour Rasulkhozha S. Sharafiddinov We present here arguments in favor of the existence of the most lightest lepton and its neutrino. This new family with a fourth lepton flavour in the first turn must uncover so far unobserved universal properties of matter. The unity of their laws predicts the flavour symmetrical schemes for the decays of the electron and the proton. Thereby, it admits the new modes in the decays of the muon, tau lepton and the neutron. At the same time, in all these transitions no conservation laws are violated. [Preview Abstract] |
Tuesday, April 8, 2014 2:42PM - 2:54PM |
Y12.00007: Measurement of the relative strong-phase difference between $D^0$ and $\overline{D^0} \to K^0_S\pi^+\pi^-$ Daniel Ambrose, Hajime Muramatsu, Ed Thorndike We present the BES-III Collaboration preliminary results for a model independent measurement of the strong phase difference between $D^0$ and $\overline{D^0} \to K^0\pi^+\pi^-$, through a binned dalitz analysis. The BES-III $\psi (3770) $ dataset generates $D^0$ and $\overline{D^0}$ pairs in a quantum-correlated state, which gives information about the CP state of the $D^0$ decay, allowing for a model independent measurement. The strong phase difference parameters $c_i$ and $s_i$ are determined for each phase bin of the $D^0 \to K^0\pi^+\pi^-$ dalitz plot by measuring the population of CP and flavor states present. These results represent a significant statistical improvement in a previously statically limited measurement, which will allow for increased precision in the measurement of unitarity triangle angle $\gamma / \phi_3$ using the decay $B^\pm \to D(K^0_S \pi^+ \pi^-)K^\pm$ through the GGSZ method. [Preview Abstract] |
Tuesday, April 8, 2014 2:54PM - 3:06PM |
Y12.00008: Study of $\psi(3770) \to non-D\bar{D}$ at BESIII Derrick Toth We describe a measurement of the branching ratio for $\psi(3770)\to non-D\bar{D}$ final states using 2.92~fb$^{-1}$ of $e^+e^-$ annihilation data collected with the BESIII detector at the BEPCII collider at $E_{CM}=3.773$~GeV. The naive expectation is that $\psi(3770)$ decays are dominated by $D\bar{D}$ final states. Published data paint an inconsistent picture, however, with reported non-$D\bar{D}$ rates ranging from consistent with zero to $\sim15\%$. We determine the yield for $\psi(3770) \to non-D\bar{D}$ in our sample by measuring the total number of hadronic events and subtracting the contributions from all expected processes. The $D\bar{D}$ component is directly measured in data with a double-$D$-tag counting technique. Continuum $q\bar{q}$ and most QED are determined with data collected at five energy points below $D\bar{D}$ threshold. Other processes, including initial-state radiation to $J/\psi$ and $\psi(3686)$, $\tau^+\tau^-$ and two-photon production, are estimated by Monte Carlo. Preliminary results for event yields and cross sections will be presented and interpreted. [Preview Abstract] |
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