Mr
Florian Bernlochner
(University of Victoria (CA))
05/07/2012, 09:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Some long-standing problems in the experimental data for semileptonic b -> c l nu decay rates have resisted attempts to resolve them, despite substantial efforts. We show that the presence of a relatively large decay rate into radially-excited D-mesons may alleviate several of these tensions simultaneously. In particular, their presence could help explaining the discrepancy between model...
Prof.
Ronald Poling
(University of Minnesota (US))
05/07/2012, 09:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
With the world largest data sample taken at psi(3770) peak with the BESIII detector at the BEPCII e+e- collider, the D+ purely leptonic and D0 semi-leptonic decays are studied. We present the preliminary branching fraction measurements of D+ -> mu nu, D0 -> K- e+ nu and D0 -> pi- e+ nu. We extract pseudoscalar decay constant of f_D using D+ purely leptonic decays and the hadronic form factors...
Dr
Cristina Biino
(Universita e INFN (IT))
05/07/2012, 09:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Semileptonic kaon decays offer the most precise determination of the CKM matrix element |Vus|. The experimental precision is however limited by the knowledge of the form factors of this decay, since these enter both the phase space integral and the detector acceptances. The NA48/2 experiment presents new high precision measurements of the form factors of the semileptonic decays of charged...
Dr
Guglielmo De Nardo
(Napoli University and INFN (IT))
05/07/2012, 09:45
Track 5 - B-Physics
Parallel Sessions
Within the standard model, the decay B+ --> tau+ nu has the largest branching fraction of any leptonic B decay, yet its reconstruction is made complicated by the multiple final-state neutrinos. The study of this decay is made possible by the ability to reconstruct the other B in the event, unique to the e+e- environment of the B factories. We present the result of an improved analysis using...
Mr
Youngmin Yook
(Yonsei University)
05/07/2012, 10:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present a measurement of the decay $B\to\tau\nu$ using the full Belle data set including $772 \times 10^6$ $B\bar{B}$ collected at the KEKB asymmetric-energy $e^+e^-$ collider. The $B\bar B$ pair events are tagged by fully reconstructing one B meson decaying in a hadronic mode and detecting the $B\to\tau\nu$ candidate in the recoil. We obtain the branching fraction for $B\to\tau\nu$ and...
Prof.
Abner Soffer
(Tel Aviv University (IL))
05/07/2012, 10:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The q^2 dependence of exclusive semileptonic form factors may be used to test standard-model theoretical calculations, and the total branching fractions provide a measure of the CKM matrix element V_ub. We report on measurements of the differential branching fractions of the exclusive semileptonic decays B-->pi l nubar, B-->eta l nubar, B-->eta’ l nubar, and B-->omega l nubar as a function of...
Mr
Christian Oswald
(Universität Bonn)
05/07/2012, 10:30
Track 5 - B-Physics
Parallel Sessions
We present a search for the four-body semileptonic baryonic decay $B^-\to p\bar p\ell^-\bar\nu_\ell$ ($\ell=e,\ \mu$) based on a data sample of 772 million $B\bar B$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. In this study, a new neural-network based hadronic $B$-meson tagging method is applied. The...
Dr
Wei Wang
(DESY (DE))
05/07/2012, 11:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present a tetraquark interpretation of the charged bottomonium-like states $Z^\pm_b(10610)$ and $Z^\pm_b(10650)$, observed by the Belle collaboration in the $\pi^\pm \Upsilon(nS)$ $(n=1,2,3)$ and $\pi^\pm h_b(mP)$ $(m=1,2)$ invariant mass spectra from the data taken near the peak of the $\Upsilon(5S)$. In this framework, the underlying processes involve the production and decays of a vector...
Dr
Claus Buszello
(Uppsala University)
05/07/2012, 11:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present the observation of a narrow mass state decaying into Y(1s)+photon, where the Y(1s) is detected by its decay into a pair of oppositely charged muons and the photon is identified through its conversion into an electron-positron pair. The significance of this observation is 5.6 standard deviation. The mass of the state is centered at 10.551+/-0.014(stat)+/-0.017 GeV, which is...
Dr
Igor Gorelov
(University of New Mexico (US))
05/07/2012, 11:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present the latest results on the search for excited bottom baryon states Lambda_b* in proton-antiproton collisions with a center of mass energy of 1.96 TeV. Using a 10/fb data sample, we study the Lambda_b* resonance states in the Lambda_b0 pi+ pi- decay mode in events collected by the CDF II detector with a displaced vertex trigger.
Dr
Konstantin Toms
(University of New Mexico (US))
05/07/2012, 11:45
Track 5 - B-Physics
Parallel Sessions
Using data collected in 2011, the ATLAS Collaboration has measured the lifetime and mass of the Lambda_b, the lifetimes and masses of the B_d and B_s mesons, and the average lifetime for inclusive B production at 7 TeV center of mass energy in proton-proton collisions. The mass ot the Lambda_b is measured with the precision above the world average. Polarization measurements of the Lambda_b are planned.
Keith Ulmer
(University of Colorado at Boulder (US))
05/07/2012, 12:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
CMS has searched for exotic charmonium states in the data sample collected in proton-proton collisions at 7 TeV in 2011. The X(3872) state is reconstructed in the J/psi pi+ pi- decay channel and the production cross-section is computed by determining the ratio to psi(2S) production in the same decay channel. For the first time, prompt and non-prompt contributions to the X(3872) cross section...
Mr
Raphael Märki
(Ecole Polytechnique Federale de Lausanne (CH))
05/07/2012, 12:15
Track 5 - B-Physics
Parallel Sessions
LHCb is a dedicated B physics experiment at the LHC. During the 2011 run the experiment collected 1.0 fb-1 of data. This large data sample allows to explore the b baryon sector with unprecedented precision. We will present the first observation of the Λb* baryons and measurements of the properties of Ξb and Ωb baryons. In addition we will present results on the production and properties of...
Dr
Matthew Barrett
(University of Hawai'i at Manoa)
05/07/2012, 13:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Using samples of 102 million $\Upsilon(1S)$ and 158 million $\Upsilon(2S)$ events collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we study hadronic exclusive decays of these two bottomonium resonances to the three-body final states $\phi KK$, $\omega \pi\pi$ and $K^{\ast 0}(892) K^- \pi^+ + {\rm c.c.}$, as well as two-body processes including the...
Dr
Walter Bonivento
(INFN Cagliari (IT))
05/07/2012, 14:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Flavour-changing neutral current decays such as c -> u l+ l– are highly suppressed in the Standard Model (SM), but may be enhanced by New Physics. For D0 -> μ+ μ–, the SM decay rate is dominated by long distance contributions but is still a few order of magnitudes below the current experimental limit. In decays such as D+ -> π+ μ+ μ–, measuring the differential branching ratio as a function of...
Prof.
Shan Jin
(Institute of High Energy Physics)
05/07/2012, 14:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
With the world largest data samples taken at J/psi, psi', and psi'' peaks with the BESIII detector at the BEPCII e+e- collider. The charmonium spectroscopy and charmonium decay dynamics are studied. We report new measurements of the resonant parameters of the spin-singlet states, eta_c, eta_c', and h_c, and their production rates in psi' transitions; we also report observations of many new...
Dr
Romulus Godang
(University of South Alabama (US))
05/07/2012, 14:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The flavor-changing neutral-current decays decays D0 --> e+e-, D0 --> mu+mu-, and D0-->gamma gamma are highly suppressed in the standard model, well below observable levels. The decay D0 --> e+mu- is further lepton-flavor violating, and thus can occur only through very slow neutrino mixing. Thus, these decays constitute sensitive probes for possible new-physics contributions. We report new...
Mr
Korneliy Todyshev
(Budker Institute of Nuclear Physics (RU))
05/07/2012, 14:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present a measurement of the main parameters of the $\psi(2S)$ and $\psi(3770)$ resonances, which has been performed with the KEDR detector at the VEPP-4M $e^{+}e^{-}$ collider.
Fitting the energy dependence of the multihadron cross section in the vicinity of the $\psi(2S)$ we obtained the mass value and the product of the electron partial width by the branching fraction into hadrons....
Dr
Valentina Santoro
(INFN Ferrara (IT))
05/07/2012, 15:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
In the past few years, several new charmonium-like states have been observed above the open-charm threshold, with properties that disfavor their interpretation as conventional charmonium states. It is not clear whether all these states are unique. Specifically, it has been suggested that the X(3915), observed in gamma gamma ->J/psi omega, and the Y(3940), observed in B-->J/psi omega K, may be...
Dr
Bruce Yabsley
(University of Sydney (AU))
05/07/2012, 15:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present the study of narrow charmonium(-like) resonances by $\chi_{c1,c2} \gamma$ final states in $B \to \chi_{c1,c2} \gamma K$ decays at Belle. The results are based on the full $\Upsilon(4S)$ data sample corresponding to $772 \times 10^6\ B\bar B$ pairs recorded by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
We present the study of $B^{\pm} \to J/\psi\, \eta\,...
Dr
Hideyuki Nakazawa
(National Central University)
05/07/2012, 15:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The invariant mass spectrum of the $\eta' \pi^+ \pi^-$ final state produced in two-photon collisions is obtained using 673 fb$^{-1}$ of data on and off the $\Upsilon(4S)$ collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The $\eta_c$ mass, width and the product of the two-photon width and the branching fraction of the decay into $\eta' \pi^+ \pi^-$ are...
Dr
Satoshi Mishima
(INFN Rome (IT))
05/07/2012, 16:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
The recently measured direct CP asymmetries in the processes D^0 -> pi^+ pi^- and D^0 -> K^+ K^- show a significant deviation from the naive Standard Model expectation. Using a general parameterization of the decay amplitudes, we show that the measured branching ratios imply large SU(3) breaking and large violations of the naive 1/N_c counting. Furthermore, rescattering constrains the I=0...
Ms
Giulia Casarosa
(SLAC & INFN (IT))
05/07/2012, 16:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present a measurement of the D0-antiD0 mixing and CP-violation parameters y_CP and Delta y using the full BABAR dataset. We reconstruct samples of D*-tagged and untagged D0 decays to the final states K+K-, K+/-pi-/+ and pi+pi-. From a simultaneous fit to the different channels, we extract the effective lifetimes of the D0 decaying to the CP-even final states and the flavor-specific...
Mr
Diego Tonelli
(CERN (CH))
05/07/2012, 16:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
Measurements of CP violation in charm meson decays are presented using the complete 10/fb dataset collected by the CDF experiment at the Tevatron. The difference between CP-violating asymmetries in D0-->K+K- and D0-->pi+pi- decays is observed to be 2.8 sigma different form zero, supporting evidence of CP violation in charm reported by other experiments. In addition, world's most precise...
Dr
Jordi Garra Tico
(University of Cambridge (UK))
05/07/2012, 16:45
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
LHCb collected 1.0 fb–1 of data in 2011, corresponding to O(10^8) fully reconstructed decays of open charm hadrons. This data provides unprecedented samples of charmed hadrons, allowing precise measurements of mixing and CP violation parameters. We report the results of searches for mixing and CP violation in 2-body and multi-body decays, with analyses using part or all of the 2011 data.
Mr
Byeong Rok Ko
(Korea University (KR))
05/07/2012, 17:00
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We measure the time-integrated rate $R_{WS}$ of the wrong-sign decay $D^0 \to K^+ \pi^- \pi^+ \pi^-$ relative to the Cabibbo-favored right-sign process. The data was recorded with the Belle detector and corresponds to an integrated luminosity of 800 fb${}^{-1}$ at the $\Upsilon(4S)$ resonance. We also report a measurement of the $CP$ asymmetry factor $A_{CP}$ by fitting the $D^0$ and $\bar...
Mr
Tao Peng
(University of Science & Technology of China)
05/07/2012, 17:15
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
We present an updated measurement of the mixing parameter $y_{CP}$ in the decays $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$. The results are obtained from the full data set of 1 ab${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider.
We report a measurement of $D^0 - \bar D^0$ mixing in $D^0 \to K^0_S \pi^+ \pi^-$ decays using a time-dependent Dalitz...
Dr
Amarjit Soni
(Brookhaven National Laboratory (US))
05/07/2012, 17:30
Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy
Parallel Sessions
CP violation in charm decays is studied in light of recent experimental findings of LHCb and CDF.Flavor symmetry violations as manifestly displayed in the data are incorporated without theoretical assumptions. Repercussions for CP asymmetries for some of the B (Bs) -decays are incorporated. Range of expectations from the Standard Model are quantified. Further directions to pursue to isolate...
