XIIth International Conference on Heavy Quarks & Leptons 2014
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Europe/Berlin
Schloss Waldthausen, Mainz, Germany
Schloss Waldthausen, Mainz, Germany
Description
The XIIth International Conference on Heavy Quarks and Leptons is dedicated to the study of the heavy quarks charm, bottom, and top with obvious extensions to interesting topics involving the strange quark. Neutrino oscillation studies and new insights in mu and tau lepton phenomenology are also included. The conference continues the tradition of regular scientific meetings, first started in 1993 at the Laboratori Nazionali di Frascati under the name "Heavy Quarks at Fixed Target", and widened in 2002 to include leptons with the workshop renamed to what is known as today.
Participants
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SpectroscopyConvener: Stefano Bianco (INFN Frascati)
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Measurements of e+e− → π π J/ψ, π π hc, ωχ, γ X(3872) and observation of Zc(3900) and Zc(4020) with BES IIIWe report a new measurement of the e+e− → π π J/ψ, π π hc, ωχ cross section, the observation of e+e− → γ X(3872), and the new observation of charged particles, Zc(3900) and Zc(4020), as well as theirs neutral particle. The results are very helpful to understand the properties XYZ statesSpeaker: Andrzej Kupsc (Uppsala University)
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Heavy Quarkonium Spectroscopy and BeyondAfter a dozen of very lively years, the spectra of heavy quarkonia below thresholds are almost complete; the last system to be explored is the Bc meson. Since few years, most discoveries happened close to open flavor thesholds, and four quark systems have attracted interest as the new spectroscopy frontier. This review will cover the unresolved questions on conventional quarkonia, the links between these spectra and the ones of heavy-light mesons and baryons, and the state-of-the-art of the so called XYZ zoo .Speaker: Dr Roberto Mussa (INFN TORINO)
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10:40
Coffee Break
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"Search for exotic charmonium" on behalf of BaBar and Belle.One of the most intriguing puzzles in hadron spectroscopy are the numerous charmonium-like states observed in the last decade, including charged states that are manifestly exotic. Over the years BaBar has extensively studied these states in B meson decays, initial state radiation processes and two photon reactions. We report new and additional studies on some of these states performed using the entire data sample collected by BaBar in e+e- collisions at center of mass energies near 10.58 GeV/c^2. Among these, the study of the process B -> J/psi phi K with a search for the X(4140) and X(4270) in their decays to J/psi phi, and a search for charged charmonium-like state Zc(3900)^+ in the decay Y(4260) -> J/psi pi+pi-.Speaker: Dr Elisabetta Prencipe (IKP - Forschungszentrum Juelich)
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Studies of the Bc-meson with the ATLAS experiment and recent results from CMSThe production of Bc-meson has been studied by ATLAS in several exclusive channels containing a J/psi. We present results on its spectroscopy and the measurement of the B_c->J/psiD(*) decay branching ratio, including relative contribution of the different helicity amplitudes.Speaker: Pavel Řezníček (Charles University Prague)
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D+ -> Ks pi+ pi0 Dalitz plot analysis with BES IIIWe perform an analysis of the D+ -> Ks pi+ pi0 Dalitz plot. The Dalitz plot is found to be well-represented by a combination of six quasi-two-body decay channels (Ks rho, Ks rho(1450), K*0bar pi+, K*0(1430)bar pi+, K(1680)bar pi+ and kapa0bar pi+) plus a small non-resonant component. Using the fractions from this analysis, partial branching ratios are updated with higher precision than previous measurements.Speaker: Peter Weidenkaff (Mainz University)
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2
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12:35
Lunch
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CKMConveners: Dr Christoph Schwanda (Institute of High Energy Physics, Austrian Academy of Sciences), Elisabetta Barberio (University of Melbourne)
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New ways to search for right-handed current in B -> ρ l νAn interesting possibility to ease the tension between various determinations of |Vub| allows a small right-handed contribution to the Standard Model weak current. The current bounds on such a contribution are fairly weak. We propose new ways to search for such a beyond Standard Model contribution in the semileptonic B -> ρ l ν decay. We suggest to use generalized asymmetries in one, two, or three angular variables as discriminators, which do not require measuring the fully differential distribution, and discuss its theoretical uncertainties. We discuss how binned measurements can access all the angular information, which may be more important for B -> ρ l ν than it is for B -> K* l+ l-. We explore the achievable sensitivity both from the available BaBar and Belle data sets, as well as from the anticipated 50 ab^-1 Belle II data.Speaker: Sascha Turczyk (University of Mainz)
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Recent results on semileptonic B and Bs decays from BelleSemileptonic B meson decays, B ➞ X l ν, are currently the preferred modes for determining the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |Vcb| and |Vub|, two fundamental parameters of the Standard Model. At the same time they can also be used to test and refine the theoretical tools used for describing B mesons and their decays. Based on the large data sample accumulated by the Belle experiment at the KEKB asymmetric energy e+ e- collider at KEK, Japan, we present new results on semileptonic B and Bs meson decays.Speaker: Jochen Dingfelder (University of Bonn)
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15:35
Coffee Break
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Measurement of the semileptonic decays D0 -> K- e+ nu and D0 -> pi0 e+ nu with BES IIIBased on the psi(3770) -> DDbar data accumulated at the BESIII experiment, we present studies of D0 -> K- e+ nu and D0 -> pi0 e+ nu decays which include preliminary results of B(D0 -> K- e+ nu) , B(D0 -> pi- e+ nu), as well as the partial decay rates of these decays in q^2 bins. The measured partial decay rates, in return, allow us to determine different parameterizations of the form factors. We also report a measurement of B(D+ -> mu+ nu_mu) which allows us to extract a product of the D+ decay constant and a CKM matrix element, f_D+ * |Vcd|.Speaker: Daniel Cronin-Hennessy (Minnesota University)
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7
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Welcome reception
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CP ViolationConvener: Maria Smizanska
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Mixing and CP violation in the Bs system with ATLASThe different amplitudes contributing to the decay of Bs into J/psi phi (mu+mu-K+K-) can be studies with a combined analysis of decay time and angular correlations. An updated analysis is presented, based on data collected in 2012 and with improved flavour tagging improving the accuracy in the CP-violating phase phi_s.Speaker: Daniel Scheirich (Charles University Prague)
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Measurements of CP violation and mixing in charm decaysLHCb 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. New updated measurements from several decay modes are presented, with complementary time-dependent and time-integrated analysesSpeaker: Dr Joerg Marks (Uni Heidelberg, Physikalisches Institut)
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10:30
Coffee Break
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Dalitz plot analysis of charmless b-hadron decaysCharmless b-hadron decays are suppressed in the Standard Model by tiny CKM matrix elements which brings the tree amplitudes to levels comparable with loop amplitudes, and potentially New Physics amplitudes. CP violation measurements using Dalitz plot analyses in multi-body decays allow to disentangle these various contributions. We report about the most recent measurements of large CP violation effects and observations of new decay modes.Speaker: Jeremy Dalseno (University of Bristol)
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Measurements of CP violating phases at LHCbThe LHCb experiment has a great potential for precise measurements of the CP violating phase in the standard model, and for searches of new phases. We report on recent measurements of the CP violating angle angle γ which is the least constrained parameter in the CKM unitarity triangle, the phase in B mixing, and direct CP violation in B decays.Speaker: Jeremy Dalseno (Bristol University)
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12:00
Lunch
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Neutrino PhysicsConveners: Adam Para (Fermilab), Gianpaolo Bellini (University & INFN Milano), Rupert Leitner (Charles University Prague)
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News on the double beta decay searchWhile neutrino oscillation experiments have finally provided the incontrovertible evidence that neutrinos mix and have finite masses the absolute scale and ordering of the masses of the three generations as well as charge conjugation and lepton number conservation properties are still unknown. In this scenario, a unique role is played by the Neutrinoless Double Beta Decay searches: these experiments can probe lepton number conservation, investigate the Dirac/Majorana nature of the neutrinos and their absolute mass scale (hierarchy problem) with unprecedented sensitivity. Today Neutrinoless Double Beta Decay faces a new era where large scale experiments with a sensitivity approaching the so-called degenerate-hierarchy region are nearly ready to start and where the challenge for the next future is the construction of detectors characterized by a tonne-scale size and an incredibly low background, to fully probe the inverted-hierarchy region. Recent results and future projects are discussed.Speaker: Maura pavan (Dipartimento di Fisica Università di Milano Bicocca)
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Status of direct neutrino mass measurementsExperimental information about the neutrino masses and lepton mixing is important both for cosmology and particle physics. Cosmological observations and neutrinoless double beta decay experiments provide an indirect access to the absolute neutrino mass scale, but are model-dependent. A model independent, direct way to measure the neutrino masses is the investigation of the kinematics of single beta decay via a precise measurement of the beta decay electron energy spectrum close to the endpoint. The talk will give an overview of direct experimental methods for neutrino mass measurements and present the status of different experiments. In case of the KArlsruhe TRItium Neutrino (KATRIN) experiment the experimental setup and status of the experiment will be described in more detail. The KATRIN experiment is designed to determine the absolute neutrino mass scale, with a sensitivity of 200 meV, by a precise energy measurement of decay electrons from tritium beta-decay close to the endpoint of the energy spectrum.Speaker: Florian Fränkle (Karlsruhe Institute of Technology)
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An update on solar neutrino physicsThe Sun as a well-defined neutrino source provides extremely important opportunities to investigate nontrivial neutrino properties such as nonzero mass, flavor mixing, neutrino oscillations, and MSW effect. The solar neutrino flux is energetically broadband, free of flavor backgrounds, and passes through quantities of matter obviously unavailable to terrestrial experiments. In this talk, after an introduction to solar neutrino phenomenology, I will describe the key features of solar neutrino experiments and I will summarize results and implicatiosn about solar neutrino detection and oscillations.Speaker: Stefano Davini (University of Houson)
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Accelerator Neutrino ExperimentsAccelerator neutrino experiments using intense beams of muon neutrinos provide a well-controlled window into the new physics of the PMNS sector which expands the conventional standard model. Long-baseline experiments are providing significantly improved precision on oscillation phenomena using matter effects, appearance and disappearance channels, and neutrinos and antineutrinos. Other experiments at shorter baselines have very large data samples, enabling greatly improved measurements.This talk will present results from a suite of accelerator experiments which address the physics of the three-neutrino model, possible non-standard interactions, and neutrino cross-sections.Speaker: Daniel Cronin-Hennessy (Minnesota University)
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15:40
Coffee Break
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Reactor Neutrino Experiments (Double Chooz, RENO)The θ13 parameter of the PMNS mixing matrix remained unknown until the first hints and estimates by both reactor and beam experiments in 2011. The most competitive limit set by the Chooz experiment let indeed open the hypothesis of a null value. A precise measurement of a non zero value enables a future observation of the CP violation and the estimate of its phase δ. The Double Chooz experiment was designed in this context and aims for a precision measurement of the θ13 neutrino mixing angle. Located at the Chooz nuclear power plant in north-eastern France, it is searching for disappearance of antineutrinos produced by the two reactors. Double Chooz relies on a two identical detector measurement. The near detector, located at a few hundred meters from the cores, before the impact of θ13 is exerted, aims at monitoring the νe flux emitted by the reactors. The far detector is located at a distance of about one kilometer from the reactor cores, near the expected first maximum amplitude of the oscillation. The comparison of these two measurements gives an estimate of the deficit induced by the oscillation, canceling most of systematic uncertainties related to neutrino flux emission and detection. The far detector began data taking in April 2011 and gave the first hint of a non zero value of θ13 by a reactor experiment that same year. The analysis enhancements and the latest results of the experiment, based on a far detector only measurement, will be presented. Data taking in the near detector is about to start, enabling a significant reduction of both reactor and detector related systematic uncertainties in a near future. The RENO experiment, located near the six Yonggwang reactors in South Korea, is based on the same two detector concept as Double Chooz. The data taking began in summer 2011 and the first θ13 results were published in 2012. The latest results released by the RENO collaboration will also be presented in this talk.Speaker: Dr Antoine Collin (MPI für Kernphysik Heidelberg)
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Precision Results on θ_13 from Daya BayThe Daya Bay Reactor Neutrino Experiment measures the neutrino mixing angle θ_13 with high sensitivity, using functionally identical detectors at appropriate distances from the cores of a nuclear power plant. We have analyzed 217 days of data with six detectors, and 404 days with the full complement of eight detectors, obtaining a sample of over two million ν ̄ep → e+n events. Combining rate and spectral shape information, we find sin^2 2θ_13 = 0.084 ± 0.005 and ∆m^2 = (2.44+0.10-0.11) × 10^−3 eV^2 for events where the neutron captures on gadolinium. Also, using the six detector data set and a rate analysis based on np capture, we find sin^2 2θ_13 = 0.083 ± 0.018. We will present details of these results, including a discussion of backgrounds and systematic uncertainties.Speaker: Jim Napolitano (Temple University)
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Discussion on Reactor Neutrino results
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Experimental searches on sterile neutrinosWhile neutrino oscillations among the three active neutrino flavors are by now well established, several anomalies observed at relatively short baselines in oscillation experiments hint towards the existence of one or more additional sterile neutrino flavors. As a consequence, several experiments are in preparation that are dedicated to test the sterile neutrino hypothesis. The present contribution gives an overview of the on-going experimental efforts, highlighting the two projects that are foreseen to start in 2015: SOX deploying a radioactive neutrino source at short distance from the BOREXINO detector at LNGS, and STEREO searching for sterile neutrino oscillations at short distance from the ILL reactor core.Speaker: Prof. Michael Wurm (JGU Mainz/PRISMA)
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Kaon PhysicsConveners: Evgueni Goudzovski (University of Birmingham), Karol Kampf (Charles University Prague), Konrad Kleinknecht (University Mainz)
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ChPT tests at NA48 and NA62 experiments at CERNNew final results from an analysis of about 400 K+- --> pi+- gamma gamma rare decay candidates collected by the NA48/2 and NA62 experiments at CERN during low intensity runs with minimum bias trigger configurations are presented. The results include a model-independent decay rate measurement and fits to Chiral Perturbation Theory (ChPT) description. The data support the ChPT prediction for a cusp in the di-photon invariant mass spectrum at the two pion threshold. The NA48/2 Collaboration at CERN has accumulated unprecedented statistics of rare kaon decays in the Ke4 modes Ke4(+-) to pi+ pi- e nu and Ke4(00) to pi0 pi0 e nu with ~one percent background contamination. The detailed study of form factors is sensitive to small isospin symmetry breaking effects. This brings new inputs to low energy QCD description and crucial tests of predictions from Chiral Perturbation Theory and lattice QCD calculations.Speaker: Dmitri Madigozhin (JINR Dubna)
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Recent KLOE results on Kaon PhysicsThe KLOE experiment at the DAΦNE φ-factory of the INFN Frascati Laboratory collected data corresponding to 2.5 fb^−1 of integrated luminosity. Neutral kaon pairs produced in φ-meson decays offer unique possibilities to perform tests of fundamental discrete symmetries. The entanglement of the two kaons is exploited to search for possible violation of CPT symmetry and Lorentz invariance in the context of the Standard-Model Extension (SME) framework. A new approach to the analysis of φ -> K_S K_L -> π+ π-, π+ π- events has been adopted allowing us to independently measure all four CPT violating parameters Δ a_μ appearing for neutral kaons in the SME. The final KLOE results on Δ a_μ will be presented. These are presently the most precise measurements in the quark sector of the SME. We also shortly discuss the perspectives for a new measurement using the KLOE-2 apparatus equipped with a new inner tracker. The measurement of the absolute BR of of the K+ -> 3π(γ) decay completes the KLOE program of precise and fully inclusive kaon dominant BR's measurements. The most recent result, BR(K± -> π± π+ π-) = (5.56 ± 0.20) % (Chiang et al.), dates back to more than 30 years ago. We use as normalization sample the tags given by K -> μν and K -> ππ0 decays. The track of the tagging kaon is backward extrapolated to the interaction point, then the kinematics of the decay φ -> K+ K-, gives us the possibility to define the path of the signal kaon (direction and momentum). The decay products of the kaons have a very low momentum, less than 200 MeV/c, and curl up in the KLOE magnetic field (0.52 T). To optimize the quality of the track reconstruction we select kaons decaying before the Drift Chamber Inner Wall (inner radius(DC) = 25 cm), so that only their decay products cross the DC (three tracks instead of four). We require at least two reconstructed tracks (pion candidates) and we count the number of K -> 3π(γ) decays from the missing mass spectrum. The final KLOE result on the BR(K+ -> π+ π- π+ (γ)) will be presented.Speaker: Aleksander Gajos (Jagiellonian University Cracow)
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Recent results and prospects of rare kaon decay measurements at LHCbKaon decays are a new area of interest at the LHCb experiment. A search for the decay K0S -> mu+ mu- is performed, based on a data sample of 1.0 fb^-1 of pp collisions at sqrt(s) = 7 TeV. The observed number of candidates is consistent with the background-only hypothesis, yielding an upper limit of B(K0S -> mu+ mu-) < 11 (9) x 10^-9 at 95 (90)% confidence level. This limit is a factor of thirty below the previous measurement. Prospects for this and other decays of strange particles are also presented.Speaker: Carla Marin Benito (Universitat de Barcelona)
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10:45
Coffee break
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The E36 Experiment at J-PARCExperiment E36 at the Japan Proton Accelerator Research Complex will study the decay of stopped kaons to search for new physics beyond the Standard Model. In particular, the experiment aims to provide the most stringent test of lepton universality to date in a measurement of the ratio of the Ke2 and Kmu2 decay widths, and will simultaneously search for light new particles, such as a heavy sterile neutrino or a dark photon. The experimental setup is based on the upgraded detector of KEK experiment E246 and includes a large-acceptance toroidal spectrometer for tracking charged particles with high resolution, combined with a photon calorimeter with large solid angle. The current status of the upcoming experiment and the planned measurements will be presented.Speaker: Steffen Strauch (University of South Carolina)
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Prospects for K+ → π+ ν ν observation at CERN in NA62The rare decays K+ ->π+ ν ν are excellent processes to make tests of new physics at the highest scale complementary to LHC thanks to their theoretically cleaness. The NA62 experiment at CERN SPS aims to collect of the order of 100 events in two years of data taking, keeping the background at the level of 10%. Part of the experimental apparatus has been commissioned during a technical run in 2012. The physics prospects and the status of the experiment will be reviewed in view of the first physics run scheduled for 2014.Speaker: Michal Koval (Comenius University Bratislava)
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Precision tests of the Standard Model with kaon decays at CERNRecent results and prospects for precision tests of the Standard Model in kaon decay in flight experiments at CERN are presented. A measurement of the ratio of leptonic decay rates of the charged Kaon at a 0.4% precision constrains the parameter space of new physics models with, for example, an extended Higgs sector. Searches for neutrino mass states and the dark photon in the ~100 MeV/c^2 mass range based on samples collected in 2003-2007 are in progress and prospects will be discussed. The NA62 experiment starting in 2014 will search for a range of lepton number and lepton flavour violating decays of the charged kaon and the neutral pion at improved sensitivities down to ~10^{-12}, probing new physics scenarios involving, for example, heavy Majorana neutrinos. The foreseen NA62 L0 trigger strategy for rare decays will be discussed.Speaker: Chris Parkinson (University of Birmingham)
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12:30
Lunch
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Lepton Flavor ViolationConvener: Tomas Blazek
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Lepton flavour and number violation measurements at LHCbThe observation of neutrino oscillations has re-opened the case for searches of lepton-flavour violating decays. We report on recent results and prospects on lepton-flavour violating τ decays, as well as searches for short or long-lived Majorana heavy neutrinos in B→μμπ decays.Speaker: Marcin Chrzaszcz (University of Zurich)
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Lepton Flavor Violating Higgs DecaysRecent discovery of the Higgs boson presents a new portal to the study of lepton flavor violation. Since Higgs couples to mass, LFV in heavy leptons is especially interesting. We describe recent results from a CMS search for H decay to muon and tau pair.Speaker: Nathan Kellams (University of Notre Dame)
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Rare DecaysConvener: Brad Cox (University of Virginia)
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Rare B and charm decays at LHCbElectroweak penguin b-hadron and c-hadron decays are very sensitive to physics beyond the Standard Model. Recent LHCb measurements have shown indications of large unexpected asymmetries in B→K*μμ, hints of lepton universality violation, and the first observation of the photon polarisation in b→sγ decays. We report the most recent LHCb results in this sector.Speaker: Marcin Chrzaszcz (University of Zurich)
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10:30
Coffee Break
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Top Quark PhysicsConvener: Joel Butler (Fermilab)
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Precision measurements of the Top quark with the ATLAS experimentThe top quark is the heaviest known fundamental particle. As it is the only quark that decays before it hadronizes, this gives us the unique opportunity to probe the properties of bare quarks. This talk will focus on a few recent precision measurements by the ATLAS Collaboration of the top quark: fiducial top pair and single top production cross sections including differential distributions will be presented alongside some top quark properties measurements. Interpretations in terms of limits on beyond the standard model and searches for new physics using top quarks will also be presented.Speaker: Susana Patricia Amor Dos Santos (LIP Lisbon, Coimbra University)
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Top quark physics results from CMSRecent results on top quark properties and interactions are presented, obtained using data collected with the CMS experiment during the years 2011 and 2012 at 7 TeV and 8 TeV center-of-mass energy. Measurements are performed for the inclusive and differential top quark pair production cross sections in several top quark final states. The mass of the top quark is extracted using several methods, including indirect constraints from the measured cross section. Cross sections for the electroweak production of single top quarks in both t- and tW-channels are also measured, and limits are set on s-channel production. Further results include measurements of top quark properties, such as the W helicity in top decays, the top pair charge asymmetry, the top quark charge as well as the search for anomalous couplings in both pair and single top-quark production. The results are compared with predictions from the standard model.Speaker: Meyer Andreas (DESY)
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Summary of recent top results from D0I present an overview of recent measurements by the D0 experiment in the top quark sector: the forward-backward asymmetry A_FB in tt production due to higher order effects of QCD, both inclusive and differential as a function of the mass of the ttbar pair, the differential tt production cross sections, the evidence for single top quark production in the s-channel, and, to conclude, the world's most precise single measurement of the mass of the top quark. The measurements are performed employing the full set of data corresponding to 9.7 fb-1 acquired by the D0 experiment in Run II of the Fermilab Tevatron proton-antiproton collider at a centre-of-mass energy of sqrt(s)=1.96 TeV.Speaker: Oleg Brandt (University of Heidelberg)
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12:30
Lunch
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New ExperimentsConveners: Angél Lopez (University of Puerto Rico), Zdenek Dolezal (Charles University Prague)
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LHCb UpgradeThe LHCb experiment is designed to perform high-precision measurements of CP violation and search for New Physics using the enormous flux of beauty and charmed hadrons produced at the LHC. The operation and the results obtained from the data collected do far demonstrate that the detector is robust and functioning very well. We therefore plan for an upgraded spectrometer by 2018 with a 40 MHz readout and a much more flexible software-based triggering system that will increase the data rate as well as the efficiency specially in the hadronic channels. Here we present the LHCb detector upgrade plans, based on the recently published technical design reports.Speaker: Tomasz Szumlak (University of Zurich)
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Status and Prospects of the NOvA ExperimentThe NOvA experiment, now nearing completion, is a new long-baseline neutrino experiment that will use an upgraded NuMI neutrino source at Fermilab and a 14-kton detector at Ash River, Minnesota. NOvA uses a highly active, finely segmented detector design that offers superb event identification capability, allowing precision measurements of electron (anti-)neutrino appearance and muon (anti-)neutrino disappearance. Through these, NOvA will provide new measurements of theta_13, theta_23, the atmospheric mass splitting, the neutrino mass hierarchy, and the CP-violating phase. This talk reviews the experiment's construction and operation timeline.Speaker: Daniel Cronin-Hennessy (University of Minnesota)
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Status and Prospects of the JUNO ExperimentI will explain the physics prospects of the JUNO experiment with a special emphasis on the determination of the mass hierarchy. Then I want to present the detector concept along with the ongoing R&D and our schedule.Speaker: Achim Stahl (RWTH Aachen)
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10:30
Coffee Break
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Status and Prospects of the Belle II ExperimentThe Belle II experiment is a new generation B-factory experiment at KEK in Japan. The construction of the SuperKEKB accelerator and the Belle II detector is now in progress aiming at the commissioning in 2016. In the conference, the physics motivation of the experiment, the search for New Physics in the enormous number of B meson and other decays, is discussed in detail with a view of the search strategy. The current construction status of the accelerator and detector is also reported, and the possible commissioning scenario is described.Speaker: Ryosuke Itoh (KEK)
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12:00
Lunch
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