DPF 2013

Session

Quark and Lepton Flavor Physics

15 Aug 2013, 08:30

University of California, Santa Cruz

233. Theoretical issues in flavor physics

Prof. Jonathan Rosner (University of Chicago)

15/08/2013, 09:00

Quark and Lepton Flavor Physics

oral presentation

Quark and lepton flavor physics presents us with a basic question: Can we understand the pattern of masses and mixings of the known quarks and leptons, and how do present and proposed measurements help to advance that goal? Topics to be discussed include the apparent suppression of new flavor-changing effects, the status of quark and lepton mixing, the implications of new measurements of...

204. Flavor Physics and Lattice QCD

Chris Bouchard (The Ohio State University)

15/08/2013, 09:30

Quark and Lepton Flavor Physics

oral presentation

Our ability to resolve new physics effects is, largely, limited by the precision with which we calculate. The calculation of observables in the Standard (or a new physics) Model requires knowledge of the associated hadronic contributions. The precision of such calculations, and therefore our ability to leverage experiment, is typically limited by hadronic uncertainties. The only...

106. Charming hadronic decays of b hadrons

Mike Williams (MIT)

15/08/2013, 10:30

Quark and Lepton Flavor Physics

oral presentation

Vast data samples of b-hadron decays to final states that contain open charm particles have been collected by the B factories and LHCb. One area of use for these final states is the study of fundamental parameters in the Standard Model (SM), e.g., the CKM angle gamma. Open charm final states can be used to search for physics beyond the SM and also as a QCD laboratory. This talk will...

148. Review of charmless three-body decays of b-hadrons

Dr Thomas Latham (University of Warwick)

15/08/2013, 11:00

Quark and Lepton Flavor Physics

oral presentation

To test for physics beyond the Standard Model it is vitally important to make precise measurements of direct and mixing-induced CP-violating observables in as many different quark-level transitions as possible. Charmless three-body B decays provide an excellent laboratory in which to make such measurements in loop-dominated decays. Extra sensitivity can also be gained from performing...

110. |Vub| from semileptonic B decays at BaBar

Biplab Dey (University of California, Riverside)

15/08/2013, 11:30

Quark and Lepton Flavor Physics

oral presentation

We report on recent BaBar results for the CKM matrix element |Vub| using both inclusive and exclusive measurements of charmless semileptonic B decays. These include the measurement of exclusive B -> pi/eta/eta'/omega l nu decays with untagged event reconstruction and the study of the q^2 and lepton energy distribution in inclusive B -> Xu l nu.

45. Measurements of B → DK decays to constrain the CKM unitarity triangle angle γ at LHCb

Mr Daniel Charles Craik (University of Warwick, UK)

15/08/2013, 11:50

Quark and Lepton Flavor Physics

oral presentation

The angle γ of the CKM unitarity triangle remains the least precisely measured parameter of the CKM mixing matrix. The precision measurement of this parameter is one of the main goals of the LHCb experiment. We present a wide range of measurements of CP violation and partial rates in B→DK decays, as well as the latest LHCb measurement of γ combining all the individual inputs.

120. Mixing-induced CP Asymmetry in semileptonic B-meson decays at BaBar

Chih-hsiang Cheng (Caltech)

15/08/2013, 13:30

Quark and Lepton Flavor Physics

oral presentation

We present the measurements of mixing-induced CP asymmetry in semileptonic B-meson decays using the full data set collected at the peak of the Y(4S), with the BABAR detector at SLAC. The lepton charge directly identifies the B meson flavor in decays; charged kaons are also used in tagging B meson flavor. Asymmetry between B meson pairs decaying as B0-B0 and B0bar-B0bar indicates CP...

173. Measurements of charm mixing and CP asymmetries in CDF data

Patrick Lukens

15/08/2013, 13:50

Quark and Lepton Flavor Physics

oral presentation

The full CDF Run II data set, corresponding to an integrated luminosity of nearly 10 fb^-1 of proton-antiproton collisions at 1.96 TeV, is used to measure mixing and CP asymmetries in charm mesons. The large number of reconstructed charm decays are used to measure CP asymmetries are measured for a number of decay modes. Mixing of D0 and D0-bar mesons is observed with a significance...

235. CP Violation measurements with the D0 experiment

Avdhesh Chandra (Rice U.)

15/08/2013, 14:10

Quark and Lepton Flavor Physics

oral presentation

We present results of the measurements of CP-violating parameters for a variety of b hadron species using the full Run 2 data set collected by the D0 detector. These include a new analysis testing for direct CP violation in B+ decays, in addition to specific semileptonic charge asymmetries of B0s and B0 decays testing for CP violation in mixing.

56. Studies of charm mixing and CP violation at LHCb

Adam Davis (LHCb)

15/08/2013, 14:30

Quark and Lepton Flavor Physics

oral presentation

LHCb has collected the world's largest sample of charmed hadrons. This sample is used to search for direct and indirect CP violation in charm, and to measure D0 mixing parameters. Preliminary measurements from several decay modes are presented, with complementary time-dependent and time-integrated analyses.

227. Charm mixing and CP Violation at Belle

Alan Schwartz (Cincinnati)

15/08/2013, 14:50

Quark and Lepton Flavor Physics

oral presentation

We report results from Belle on charm mixing and CP violation: the topics include A_CP(D^0->pi0 pi0), D->K 3pi WS rate, CPV in Lambda_c, D mixing in D->h h, and CPV in D->Ks K+.

43. Studies of hadronic B decays to open charm mesons at LHCb

Prof. Steven Blusk (Syracuse University)

15/08/2013, 15:10

Quark and Lepton Flavor Physics

oral presentation

LHCb has collected unprecedented large samples of B hadron decays to final states involving charmed hadrons. These decays offer many complementary measurements of CP violation and CKM matrix parameters, and serve as a laboratory for testing effective theories of hadron decays. We present a selection of new world leading results in these types of decays, including first observations of new...

225. Hadronic B Decays from Belle

Youngjoon Kwon (Yonsei)

15/08/2013, 16:00

Quark and Lepton Flavor Physics

oral presentation

We report new results on hadronic B decays including the B->pi0 pi0 BF and asym and B->phi (K pi) BF's, angular correlations and asymmetries as well as other related modes.

87. Measurement of phi_s at LHCb

Prof. Olivier Leroy (CPPM)

15/08/2013, 16:20

Quark and Lepton Flavor Physics

oral presentation

The study of CP violation in Bs oscillations is one of the key goals of the LHCb experiment. Effects are predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. We present the world’s best measurement of the CP-violating phase φs using B0s → J/ψφ and B0s → J/ψππ decays.

46. Studies of asymmetries in semileptonic B decays at LHCb

Prof. Michael Sokoloff (Cincinnati)

15/08/2013, 16:40

Quark and Lepton Flavor Physics

oral presentation

LHCb has recorded large samples of semileptonic B decays. These provide potential to study CP violation effects in the B0 and Bs0 systems. Decay time-integrated or time-dependent asymmetries between charge-conjugate final states probe CP violation in B(s)0 mixing through the measurement of the parameter Afs (sometimes referred to as Asl). These measurements rely on data-driven techniques...

222. CP Violation results from Belle

Matthew Barrett (U Hawaii)

15/08/2013, 17:00

Quark and Lepton Flavor Physics

oral presentation

We report Belle results on CP violation in b->u modes such as B->rho0 rho0 and B->pi+ pi- as well as in b->s modes including B^0-> omega K_S and eta' K_S.

119. Recent results on CP and T Violation in hadronic B-meson decays at BaBar

Tomonari Miyashita (Caltech)

15/08/2013, 17:20

Quark and Lepton Flavor Physics

oral presentation

We present the observation of Time-reversal asymmetry as well as a selection of recent results on CP violation effects in hadronic B-meson decays using the full data set collected at the peak of the Y(4S) with the BABAR detector at SLAC. They include measurements of processes sensitive to the angles of the Unitarity Triangle and studies of direct CP violation.

121. B -> omega omega, omega phi, CP violation in B to three kaons, and other charmless B-meson decays

Justin Albert (University of Victoria)

16/08/2013, 08:30

Quark and Lepton Flavor Physics

oral presentation

The B decays to omega omega and omega phi are related to B -> phi K* via an SU(3) rotation. The study of these yet unseen decay modes can therefore provide information regarding the unexpectedly small value of the longitudinal spin component (f_L) measured in B -> phi K* decays. We present here the results of a new search for these decay modes, as well as other charmless B...

226. Results from Belle's Upsilon(5S) data sample

Dan Santel (Cincinnati)

16/08/2013, 08:50

Quark and Lepton Flavor Physics

oral presentation

We report results on new resonances and B_s physics from Belle unique dataset at the Upsilon(5S) resonance. The results include Z_b->B B^*, B^* B^*; Obervation of the Upsilon(1D), Scan of Upsilon(nS) pi+pi-, B_s->J/psi K+K-, B_s ->Ds h and related modes.

228. Results on New Particles from Belle

Roberto Mussa (Torino)

16/08/2013, 09:10

Quark and Lepton Flavor Physics

oral presentation

We report recent Belle results on new particles including observation of the Z_c(3894), observation of a chi_c1 gamma resonance, observation of the eta_b(1S), eta_b(2S), h_b and chi_b states and determination of the quantum numbers of the Z(4430).

171. Measurements of the properties of bottom baryons at CDF

Patrick Lukens (Fermilab)

16/08/2013, 09:30

Quark and Lepton Flavor Physics

oral presentation

We report measurements of the masses and mean lifetimes for ground state b-baryons updated with the full Tevatron run II data set obtained by the CDF detector. The baryons are reconstructed in decay modes with a J/psi or Xi_c, namely Lambda_b --> J/psi Lambda, Xi_b^- --> J/psi Xi, Omega_b --> J/psi Omega, Xi_b^- --> Xi_c^0 pi^-, and Xi_b^0 --> Xi_c^- pi^+. These are legacy measurements for...

137. Measurements of b hadron lifetimes and effective lifetimes at LHCb

Mr Bilas Pal (Syracuse University)

16/08/2013, 10:30

Quark and Lepton Flavor Physics

oral presentation

Precision measurements of b-hadron lifetimes are a key goal of the LHCb experiment. In the Bs0 sector, the measurement of the effective lifetimes for Bs0 mesons decaying to CP-odd, CP-even and flavor specific final states are essential for constraining the Bs0 mixing parameters, ΔΓs, the average width Γs and the CP-violating phase, φs. Measurements of b baryon lifetimes are also important to...

95. Latest D Meson Hadronic Branching Fractions from CLEO

Peter Onyisi (U. Texas Austin)

16/08/2013, 10:50

Quark and Lepton Flavor Physics

oral presentation

The branching fractions of the decays $D^0 \to K^- \pi^+$, $D^+ \to K^- \pi^+ \pi^+$, and $D_s \to K^- K^+ \pi^+$ normalize many measurements of processes involving charm quarks. In addition hadronic $D$ decays probe the interaction of short-distance weak processes and long-distance QCD effects. We report results on three $D^0$, six $D^+$, and thirteen $D_s$ branching fractions obtained...

236. The serch for Bs-> mumu at D0

Marj Corcoran (Rice University)

16/08/2013, 11:10

Quark and Lepton Flavor Physics

oral presentation

We present a search for the rare decay Bs-> mu mu in the D0 detector. All results are based on the full D0 data set of 10.4 fb-1 of integrated luminosity.

124. Precision measurement of the D0 mass and of the natural line width of the D*+

Dr Ray Cowan (M.I.T.)

16/08/2013, 11:30

Quark and Lepton Flavor Physics

oral presentation

We present the measurement of the mass of the D0 meson, the D*(2010)+ natural line width, and the mass difference between the D*(2010)+ and the D0 mesons using pure samples of D*(2010)+ --> D0 pi+ decays. The measurements are based on a data sample corresponding to an integrated luminosity of about 477 fb-1, collected with the BaBar detector. Large improvements with respect to the...

82. Use of B->J/psi f0 decays to discern the q anti-q or tetraquark nature of scalar mesons

Prof. Sheldon Stone (Syracuse, LHCb)

16/08/2013, 11:50

Quark and Lepton Flavor Physics

oral presentation

We consider the relative decay rates of B0 and Bs mesons into a J/psi plus a light scalar meson either the f0(500) (\sigma) or the f0(980). We show that it is possible to distinguish between the quark content of the scalars being quark-antiquark or tetraquark by measuring specific ratios of decay rates. Using current data we determine the ratio of form-factors in $Bs -> J/psi f0(980) with...

100. KOTO experiment: searching for K_{L}->pi^{0} nu bar{nu}

Jia Xu (University of Michigan)

16/08/2013, 14:30

Quark and Lepton Flavor Physics

oral presentation

We are going to report on the performance of the K0TO experiment at J-PARC during the 2013 physics run. The goal of K0TO is to discover and measure the rate of the rare decay KL into pi0 nu nubar . This flavor changing neutral current decay violates CP directly and proceeds through second-order weak interactions. The Standard Model predicts the branching ratio to be (2.8+/-0.4)x10^(-11)....

128. Measurements of tau hadronic branching fractions and spectra, and search for second class current tau decays

Alexandre Beaulieu (University of Victoria)

16/08/2013, 14:50

Quark and Lepton Flavor Physics

oral presentation

We present a set of preliminary and final results on tau branching fractions and invariant mass spectra, and a search for the second class current decay tau -> pi eta'(958) nu_tau. The results include new studies of a large number of 3 and 5-prong tau decay modes, either inclusive or classified according the hadronic resonance content (K0S, eta, omega, etc.). All results are based on the...

103. Searches for rare and forbidden kaon decays at the NA62 experiment at CERN

Matthew Moulson (INFN Frascati)

16/08/2013, 14:50

Quark and Lepton Flavor Physics

oral presentation

The decay K+ -> pi+ nu nu-bar is highly suppressed in the Standard Model (SM), while its rate can be predicted with minimal theoretical uncertainty. The branching ratio for this decay is thus a sensitive probe of the flavor sector of the SM.; however, the smallness of this BR (8 x 10^-11) and challenging experimental signature make it very difficult to measure. The primary goal of the NA62...

36. ORKA: The Golden Kaon Experiment

Dr Anna Mazzacane (Fermilab)

16/08/2013, 15:10

Quark and Lepton Flavor Physics

oral presentation

Precision measurement of the ultra-rare $K^+\to\pi^+\nu \bar\nu$ decay at Fermilab would be one of the most incisive probes of quark flavor physics this decade. Its dramatic reach for uncovering new physics is due to several important factors: The branching ratio is sensitive to most new physics models which extend the Standard Model to solve its considerable problems. The Standard Model...

52. Studies of the electroweak penguin transitions and radiative B decays at LHCb

Mr Espen Eie Bowen (Universitaet Zuerich (CH))

16/08/2013, 15:10

Quark and Lepton Flavor Physics

oral presentation

Rare b→sμ+μ– transitions that proceed via flavour changing neutral currents are suppressed in the SM and provide a sensitive probe of new physics contributions entering in competing diagrams. The dataset collected with the LHCb experiment has enabled measurements to be made in decays such as B→K*0μ+μ–, B+→K+μ+μ– and Bs→φμ+μ–. Particularly interesting are the angular and isospin asymmetries in...

200. Belle II (construction, commissioning and prospects)

Sven Vahsen (U Hawaii)

16/08/2013, 15:30

Quark and Lepton Flavor Physics

oral presentation

We report on the construction and plans for initial operation of Belle II and SuperKEKB. The new facility will be an upgrade of the existing KEKB electron-positron collider, with a target luminosity of 8 x 10^{35} /cm^2/s - about 40 times greater than that of KEKB. The Belle II detector will study rare flavor physics processes with unprecedented sensitivity for indirect...

224. Measurements of Electroweak Penguins at Belle

Dr Jared Yamaoka (University of Hawaii)

16/08/2013, 15:30

Quark and Lepton Flavor Physics

oral presentation

Recent measurements of exclusive and inclusive B->X_s l+ l- and b->s gamma decays are reported from Belle.

44. Searches for rare decays at LHCb

Mr Mathieu Perrin-Terrin (CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France)

16/08/2013, 15:50

Quark and Lepton Flavor Physics

oral presentation

Rare decays of beauty and charm hadrons and lepton flavour/number violating decays of tau leptons test the flavour structure of the underlying theory at the level of quantum corrections. They provide information on the couplings and masses of heavy virtual particles appearing as intermediate states. A review of recent results obtained by LHCb on these topics will be presented.

132. The Mu2e Experiment At Fermilab

Dr Rob Kutschke (Fermilab)

16/08/2013, 15:50

Quark and Lepton Flavor Physics

oral presentation

The Mu2e experiment at Fermilab will search for coherent, neutrino-less conversion of muons into electrons in the Coulomb field of a nucleus with an improvement in sensitivity of a factor of 10,000 over existing limits. Such a lepton flavor-violating reaction probes new physics at a scale inaccessible with direct searches at either present or planned high energy colliders. The experiment...

193. LYSO Crystal Calorimeter in the Mu2e Experiment

Chih-Hsiang Cheng (Caltech)

16/08/2013, 16:10

Quark and Lepton Flavor Physics

oral presentation

Mu2e is a new experiment planned at Fermilab to study charged lepton flavor violation in muon to electron conversion in presence of a nucleus. Muons produced by 8-GeV protons on target are captured by an aluminum target and, if converting to an electron, generate a signal of a 105 MeV monoenergetic electron. Mu2e is designed to reach a sensitivity of a few times 10^{-17} in the ratio of mu-e...

223. Leptonic and semileptonic decays at Belle

Kurtis Nishimura (SLAC)

16/08/2013, 16:30

Quark and Lepton Flavor Physics

oral presentation

We report Belle results on missing energy decays such as B->tau nu, B->D* tau nu as well other recent results on semileptonic decays (e.g. B->pi/rho l nu with tags)

174. Lepton Flavour Violation in Extended Higgs Sectors

Emilie Passemar (LANL)

16/08/2013, 16:50

Quark and Lepton Flavor Physics

oral presentation

With the discovery of a new boson with a mass around 125 GeV so far compatible with the standard model Higgs, a new era in the understanding of the electroweak symmetry breaking mechanism has started. Searches for lepton flavour violating (LFV) effects at the LHC associated to the Higgs sector offer an interesting possibility to test for new physics scenarios. In this talk, we will consider...

93. Production and spectroscopy of hadrons containing b quark at ATLAS

Ms Rui Wang (University of New Mexico)

16/08/2013, 17:10

Quark and Lepton Flavor Physics

oral presentation

We present a study of the B-hadron family production and spectroscopy. We reconstruct B ground states in the hadronic decay modes with a J/psi in the final state. Some relevant excited states are reconstructed through the hadronic transitions. This study is based on 4.8fb^-1 2011 7TeV and 19.2fb^-1 2012 8TeV datasets collected by the ATLAS detector.