EPS HEP 2015

Session

Flavour Physics and Fundamental Symmetries

4

23 Jul 2015, 09:00

157. Electroweak penguins at LHCb

Samuel Coquereau (Centre National de la Recherche Scientifique (FR))

23/07/2015, 09:00

Flavour Physics and Fundamental Symmetries

talk

Electroweak 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 and hints of lepton universality violation. Latest results involving new decay modes are presented.

235. Angular analysis of the decay B0 --> K*0 mu mu with CMS

Dr Mauro Dinardo (Universita & INFN, Milano-Bicocca (IT))

23/07/2015, 09:15

Flavour Physics and Fundamental Symmetries

talk

The Flavour Changing Neutral Current decay, B0 -> K*0 mu+mu-, is very sensitive to New Physics through its observables like A_FB (muon forward backward asymmetry), F_L (longitudinal polarisation of K*), and differential branching fraction. So far, these parameters are consistent with the Standard Model prediction. We will report the recent results from CMS on these parameters using the 20...

648. B to K* l+l- decays in the Standard Model: a theoretical reappraisal

Ayan Paul (INFN, Sezione di Roma)

23/07/2015, 09:30

Flavour Physics and Fundamental Symmetries

talk

The rare semileptonic B_d → K∗μ+μ− decay has been extensively studied within the Standard Model (SM) and beyond. In the last two releases, measurements provided by the LHCb experiment suggested a discrepancy found between the theoretical SM prediction and the experimental value of the angular observable P′5 at low q^2. We critically reassess the theoretical uncertainties in the Standard...

310. Violation of lepton flavour universality in composite Higgs models

Peter Stangl (Excellence Cluster Universe, Munich)

23/07/2015, 09:45

Flavour Physics and Fundamental Symmetries

talk

We investigate whether the $2.6\sigma$ deviation from lepton flavour universality in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays recently observed at the LHCb experiment can be explained in minimal composite Higgs models. We show that a visible departure from universality is indeed possible if left-handed muons have a sizable degree of compositeness. Constraints from $Z$-pole observables are avoided...

446. A class of Z' models with non-universal couplings and protected flavor-changing interactions

Javier Fuentes-Martin (IFIC, Universitat de València-CSIC)

23/07/2015, 10:00

Flavour Physics and Fundamental Symmetries

talk

Motivated by the $b\to s{\ell }^{+}{\ell }^{-}$ anomalies recently reported by the LHCb collaboration, I will present a class of flavored ${\mathrm{U}(1)}^{\prime }$ gauge extensions of the Standard Model that naturally accommodate them and present a rich phenomenology. This class of models is characterized by the presence of tree-level flavor-changing $Z^{\prime }$ couplings in the down-quark sector, protected by...

311. Leptonic and Radiative B meson decays at Belle

Paoti Chang (National Taiwan University)

23/07/2015, 10:15

Flavour Physics and Fundamental Symmetries

talk

We will present new results on leptonic and radiative leptonic decays. Purely leptonic B meson decays, $B\to \ell \nu$, are helicity-suppressed in the Standard Model (SM), and while more challenging for the extraction of the CKM matrix element $|V_{ub}|$, they are excellent probes of models beyond the SM. The decay $B\to \ell \nu \gamma$ is not affected by this suppression and gives access to...

159. Measurements of the photon polarisation in b→γs decays

Pablo Ruiz Valls (Instituto de Fisica Corpuscular (ES))

23/07/2015, 11:30

Flavour Physics and Fundamental Symmetries

talk

LHCb recently reported the first observation of a non-zero photon polarisation in b→γs decays. The interpretation of this result in terms of potential right-handed currents is still open. New results from the decays Bs→φγ and B0→K0ee are presented.

164. Charmless B decays

Brais Sanmartin Sedes (Universidade de Santiago de Compostela (ES))

23/07/2015, 11:45

Flavour Physics and Fundamental Symmetries

talk

Charmless B meson decays proceed via suppressed b→u tree and b→s,d penguin diagrams and are thus sensitive to New Physics. We present recent results on angular analyses of B→VV decays and searches for very suppressed decay modes.

356. Origin of a large CP asymmetry in B+- --> K+- K+ K- decays

Prof. Leonard Lesniak (Henryk Niewodniczanski Institute of Nuclear Physics PAS, Krakow, Poland)

23/07/2015, 12:00

Flavour Physics and Fundamental Symmetries

talk

Large CP-violating asymmetry effects in the B+- --> K+- K+ K- decays have been predicted in the QCD factorization model [1]. The model includes strong K+ K- final-state long-distance interactions in the S-, P-, and also (in the recent analysis) D- wave two-body states. The S-wave two-body unitarity conditions involve interchannel couplings of the kaon-kaon states with the intermediate...

314. Investigation of 3-body Hadronic decays at Belle

Min-Zu Wang (National Taiwan Univ.)

23/07/2015, 12:15

Flavour Physics and Fundamental Symmetries

talk

We present recent measurements of B mesons to 3-body hadronic final states. These measurements test factorization predictions, search for final-state interactions and measure strong interaction amplitudes using Dalitz-plot analysis techniques. The results employ the full Belle dataset and are our final measurements for these modes.

480. Charmless Two-body Baryonic $B_{u,d,s}$ Decays

Chun-Khiang Chua

23/07/2015, 12:30

Flavour Physics and Fundamental Symmetries

talk

We study charmless two-body baryonic $B$ decays using the topological amplitude approach. We extend a previous work to include all ground state octet and decuplet final states with full topological amplitudes. Relations on rates and CP asymmetries are obtained. With the long awaited ${\bar{B}}^0\to p\overline{p}$ data, we can finally extract information on the topological amplitudes and predict...

376. Searches for $B^0\to \eta {\pi }^0$ and $B_s\to K^0{K}^0$ at Belle

MING-CHUAN CHANG (FU JEN CATHOLIC UNIVERSITY)

23/07/2015, 12:45

Flavour Physics and Fundamental Symmetries

talk

Charmless decays of $B$ and $B_s$ mesons provide nice testing ground for the Standard Model (SM) and excellent probes for physics beyond the SM. The Belle experiment has produced many results in this subject by analyzing the high-statistics event sample of $B$ and $B_s$ meson decays. We present the searches for the two-body charmless rare decays $B^0\to \eta {\pi }^0$ and $B_s\to K^0{K}^0$ using...

158. Searches for low mass dark bosons

Andrea Mauri (UZH)

23/07/2015, 14:30

Flavour Physics and Fundamental Symmetries

talk

Many models extending the SM to account for dark matter or explain inflation predict the existence of O(1) GeV mass particles with long lifetimes. LHCb's detection capabilities for detached vertices are exploited to search for particles decaying to muon pairs. New results are presented.

430. Search for the dark photon in ${\pi }^0$ decays

Riccardo Fantechi

23/07/2015, 14:45

Flavour Physics and Fundamental Symmetries

talk

A sample of 17 million fully reconstructed ${\pi }^0$ Dalitz decays produced in charged kaon decays in flight collected by the NA48/2 experiment at CERN in 2003-04 is analysed to search for the dark photon ($A$) via the decay chain ${\pi }^0\to \gamma A$, $A\to e^{+}{e}^{-}$. No dark photon signal is observed, and the most stringent limits on the dark photon mixing parameter in the...

165. Measurements of CP violation in $B_{d/s}^0$ mixing through $B\to J/\mathrm{\Psi }X$ decays

Greig Cowan (University of Edinburgh (GB))

23/07/2015, 15:00

Flavour Physics and Fundamental Symmetries

talk

B mesons provides an ideal laboratory for measurements of CP violation and searches for CPV beyond the Standard Model. Recent measurements of the mixing phases of the $B_s$ and $B_d$ mesons, ${\varphi }_s$ and $\sin 2\beta$, using decays to $J\mathrm{\Psi }$X final states are presented. In view of future improved measurements, a good understanding of pollution from sub-leading penguin topologies in...

234. Phi_s and Delta Gamma_s measurement in B->J/psi Phi using CMS data

Paula Eerola (Dept of Physical Sciences, Univ. of Helsinki)

23/07/2015, 15:20

Flavour Physics and Fundamental Symmetries

talk

The study of CP violation in the decay channel Bs->Jpsi Phi is very important to explore physics beyond Standard Model in the quark flavour sector. The measurements of Phi_s and the decay width difference (Delta Gamma_s) are key parameters to look for BSM physics. We will report the recent results on these parameters using the 20 fb-1 data set collected in 2012.

638. New physics searches with heavy flavour observables at ATLAS

Cristiano Alpigiani (University of Washington, Seattle)

23/07/2015, 15:35

Flavour Physics and Fundamental Symmetries

talk

The large amount of Heavy Flavour data collected by the ATLAS experiment is potentially sensitive to New Physics, which may be found in the mixing of B meson states, or through processes that are naturally suppressed in the Standard Model. We present the new results on the measurement of the decay of the Bs into J/psi phi based on full data collected in LHC Run-1 and with updated flavour...

231. The Precision of the CKM Angles $\beta$ and ${\beta }_s$

Philipp Frings (Karlsruhe Institute of Technology)

23/07/2015, 16:30

Flavour Physics and Fundamental Symmetries

talk

The CKM angle $\beta$ (${\beta }_s$) is one of the key $CP$-violation parameters in the SM. It is best determined by the mixing-induced $CP$ asymmetry in the decay $B_d\to J/\psi K_S$ ($B_s\to J/\psi \varphi$). However, the theoretical precision of this determination has been under discussion for a long time and the estimated uncertainties ranged from negligible to sizable. The possible...

182. Precision measurement of Δmd using semi-leptonic decays at LHCb

Basem Khanji (Universita & INFN, Milano-Bicocca (IT))

23/07/2015, 16:45

Flavour Physics and Fundamental Symmetries

talk

The Bd meson oscillation frequency sets strong contraints on the CKM matrix. A precision measurement using semileptonic decays is presented.

462. Re-examining $\sin 2\beta$ and $\mathrm{\Delta }{m}_d$ from evolution of $B_d^0$ mesons with decoherence

Prof. Sankagiri Umasankar (Indian Institute of Technology Bombay)

23/07/2015, 17:00

Flavour Physics and Fundamental Symmetries

talk

In the time evolution of neutral meson systems, a perfect quantum coherence is usually assumed. The important quantities of the $B_d^0$ system, such as $\sin 2\beta$ and $\mathrm{\Delta }{m}_d$, are determined under this assumption. However, the meson system interacts with its environment. This interaction can lead to decoherence in the entangled mesons even before they decay. In our formalism this...

335. Study of CP asymmetry in B0-B0bar mixing using inclusive dilepton samples obtained with the BABAR detector

Tomonari Miyashita (Caltech)

23/07/2015, 17:15

Flavour Physics and Fundamental Symmetries

talk

The asymmetry between same sign inclusive dilepton samples (l^+l^+ and l^-l^-) from semileptonic B decays in Upsilon(4S) -> B0 B0bar events allows us to compare the B0 mixing probabilities P(B0bar -> B0) and P(B0 -> B0bar), and hence to test T and CP invariance. We present a measurement of CP asymmetry in inclusive dilepton samples using the full BABAR dataset near the Upsilon(4S)...

334. Observation of CP violation in B0->D_CP($\star$)h0 decays in a combined analysis using BABAR and Belle data

Markus Roehrken (California Institute of Technology)

23/07/2015, 17:30

Flavour Physics and Fundamental Symmetries

talk

We report on a time-dependent CP violation measurement of B0->D_CP($\star$)h0 decays, where the light neutral hadron h0 is a pi0, eta, or omega meson, and the neutral D meson is reconstructed in decays to two-body CP eigenstates K+ K-, K_S pi0, or K_S omega. The measurement is performed by combining the final data samples of 471 million BBbar pairs collected by the BABAR experiment and 772...

690. Search for Violation of CPT and Lorentz invariance in $B_s^0$ meson oscillations

Iain Bertram (Lancaster University)

23/07/2015, 17:45

Flavour Physics and Fundamental Symmetries

talk

We present the first search for exclusive CPT-violating effects in the mixing of $B_s^0$ mesons using the full Run II data set with an integrated luminosity of 10.4 fb${}^{-1}$ of proton-antiproton collisions collected using the D0 detector at the Fermilab Tevatron Collider. We find no evidence for the CPT-violating effects tested and place limits on CPT- and Lorentz-invariance violating...

160. Measurements of Vub and Vcb at LHCb

Marina Artuso (Syracuse University (US))

24/07/2015, 09:00

Flavour Physics and Fundamental Symmetries

talk

The long standing discrepancies between the measurements of Vub and Vcb in inclusive and exclusive decays are still unresolved. LHCb recently reported the first observation of the baryon decay Λb→pμν and the related measurement of Vub. Similarly, Λb→Λcμν is used to constrain Vcb and the associated form-factors. Future prospected will also be presented.

345. Inclusive electron spectrum from B-meson decays and determination of |Vub|

Yuri Skovpen (Budker Institute for Nuclear Physics)

24/07/2015, 09:15

Flavour Physics and Fundamental Symmetries

talk

The inclusive electron spectrum from B-meson decays is measured using a sample of 467 million BBbar pairs recorded with the BABAR detector. Contributions from CKM-favored and CKM-suppressed semileptonic B decays, from secondary decays of charm hadrons and from continuum e+e- -> qqbar annihilations are evaluated using a simultaneous fit to data collected at the Y(4S) resonance and at collision...

346. Measurement of the D -> pi- e+ nu partial branching fraction and form factor, and implications for Vub.

Arantza Oyanguren (IFIC - Univers. de Valencia)

24/07/2015, 09:30

Flavour Physics and Fundamental Symmetries

talk

Precision measurements of the D -> pi e+ nu form factor could shed new light on the persistent difference between inclusive and exclusive measurements of Vub. We report the measurement of the partial branching fraction of D -> pi e+ nu in intervals of the four-momentum-transfer squared from D to pi using 347.2 /fb of integrated luminosity of the BaBar data. The D -> pi form factor is...

306. Semileptonic B and Bs decays at Belle

Robin Glattauer (Institute of High Energy Physics Vienna)

24/07/2015, 09:45

Flavour Physics and Fundamental Symmetries

talk

Semileptonic B meson decays, $B\to X\ell \nu$, are currently the preferred modes for determining the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements $|V_{cb}|$ and $|V_{ub}|$, 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 the production of B mesons and their decays. Based on the large data...

824. Vub and Vcb determinations: recent results and prospects

Paolo Gambino (università di torino)

24/07/2015, 10:00

Flavour Physics and Fundamental Symmetries

talk

The most precise determinations of Vub and Vcb come from semileptonic B decays. The results of the B factories, analysed in the light of the most recent theoretical calculations, are puzzling. For both Vcb and Vub the determination based on exclusive channels is about 3σ below the one based on inclusive decays. This discrepancy has survived several checks and may be an indication of new...

161. B→D*τν at LHCb

Marta Calvi (Univ. degli Studi Milano-Bicocca)

24/07/2015, 10:20

Flavour Physics and Fundamental Symmetries

talk

The decay B→D*τν is sensitive to new physics and its rate exhibits a hint of deviation from the SM expectation. LHCb presents its first measurement of this mode.

312. Tree-level new physics searches in B decays to τ leptons at Belle

Philipp Hamer (Goettingen)

24/07/2015, 10:35

Flavour Physics and Fundamental Symmetries

talk

Semileptonic and leptonic B meson decays involving a heavy $\tau$ lepton are sensitive to new physics scenarios with an extended Higgs sector, such as the type-II two-Higgs-doublet model. Decays that have been studied at Belle include $B\to D^{(\ast )}\tau \nu$ , $B\to \tau \nu$ and $B\to \pi \tau \nu$. In this talk we report new and updated results for these modes, based on the large data sample...

344. Exclusive semileptonic B decays to a D or D* meson and one or two pions

Thomas Lueck (SLAC)

24/07/2015, 10:50

Flavour Physics and Fundamental Symmetries

talk

The experimental knowledge of semileptonic B decays to a D or D* meson with one or more pions is limited. These limitations are relevant to two experimental puzzles: the tension between the values of |Vcb| determined from inclusive and exclusive semileptonic decays, and the gap between the sum of the exclusive semileptonic B decays to charm and the inclusive b -> c l nu rate. The full BABAR...

777. Kaon Theory News

Andrzej Buras (Munich)

24/07/2015, 11:30

Flavour Physics and Fundamental Symmetries

talk

After stressing the importance of kaon physics in searching for new physics I will briefly summarize the status of the parameter $ϵ$_K in the standard model. The second part of my talk will be the presentation of new analyses of $K^{+}\to {\pi }^{+}\nu \overline{\nu }$ and $K_L\to {\pi }^0\nu \overline{\nu }$ in the Standard Model and beyond. Finally, motivated by recent...

280. KL --> pi0 nu nu(bar) Beyond the Grossman-Nir Bound

Prof. George W.S. Hou (National Taiwan University)

24/07/2015, 11:50

Flavour Physics and Fundamental Symmetries

talk

We do not violate the Grossman-Nir (GN) bound per se, but point out that the commonly perceived current GN bound of B(KL --> pi0 nu nu(bar)) < 1.4 x 10^-9 can be evaded, if a weakly interacting narrow state falls into the windows of kinematic exclusion of the K+ --> pi+ nu nu(bar) experiments. An explicit example is a Z' boson motivated by the muon g-2 anomaly and linked with flavor physics....

434. Prospects for K+ ->pi+ nu nu observation at CERN in NA62

Vito Palladino (CERN)

24/07/2015, 12:05

Flavour Physics and Fundamental Symmetries

talk

The rare decays K+ ->pi+ nu nu 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...

432. First observation of K->pi+pi0e+e- decay at NA48

Riccardo Fantechi (INFN - Sezione di Pisa)

24/07/2015, 12:20

Flavour Physics and Fundamental Symmetries

talk

We report the first observation of the very rare decay K+- -> pi+- pi0 e+ e- by the NA48/2 experiment. From a clean sample of almost 2000 reconstructed signal events, we have determined the branching fraction with high precision and measured the e+ e- invariant mass distribution, which allows to differentiate between different decay models.

467. epsilon’ / epsilon from the lattice and its implications

Dr amarjit soni (Brookhaven National Lab)

24/07/2015, 12:35

Flavour Physics and Fundamental Symmetries

talk

Recent publication [arXiv:1505.07863 by RBC and UKQCD Collaborations] of the first lattice QCD calculation of the complex kaon decay amplitude A₀ with physical kinematics, using a single 32³ x 64 domain wall ensemble is discussed. Approximate agreement with the experimental value for Re(A₀) is obtained.. The calculated value of Im(A₀) is used to...

305. $B\to K^{(\ast )}\nu \overline{\nu }$ decays in the Standard Model and beyond

Christoph Niehoff (Excellence Cluster Universe, Munich)

24/07/2015, 12:50

Flavour Physics and Fundamental Symmetries

talk

We present an analysis of the rare exclusive $B$ decays $B\to K\nu \overline{\nu }$ and $B\to K^{\star }\nu \overline{\nu }$ within the Standard Model (SM), in a model-independent manner, and in a number of new physics (NP) models. Combining new form factor determinations from lattice QCD with light-cone sum rule results and including complete two-loop electroweak corrections to the SM Wilson coefficient, we...

646. A Critical Examination of SU(3) in D to P P Decays

Ayan Paul (INFN, Sezione di Roma)

24/07/2015, 14:30

Flavour Physics and Fundamental Symmetries

talk

The question of the validity of analyzing charmed meson decays to pairs of hadrons within the SU(3) framework has been long and often debated. While there are convincing arguments that small breaking of this symmetry can accommodate for the current experimental results, the inability to compute QCD effects in these modes render it quite impossible to justify with complete authority the...

162. Searches of CP violation in two-body charm decays

Michael Thomas Alexander (University of Glasgow (GB))

24/07/2015, 14:45

Flavour Physics and Fundamental Symmetries

talk

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. New updated measurements from several decay modes are presented, with complementary time-dependent and time-integrated analyses. We report on recent measurements of CP asymmetries in D→KK and D→ππ decays using the...

163. Searches of CP violation in multibody charm decays

Maurizio Martinelli (Ecole Polytechnique Federale de Lausanne (CH))

24/07/2015, 15:00

Flavour Physics and Fundamental Symmetries

talk

LHCb has collected the world's largest sample of charmed hadrons. Recently many searches for CP violation have focused on analysing the Dalitz phase space. New results and novel techniques are presented.

742. UTfit Collaboration Average of D meson mixing data.

Denis Derkach (University of Oxford (GB))

24/07/2015, 15:15

Flavour Physics and Fundamental Symmetries

talk

We update the analysis of D meson mixing including the latest experimental results as of May 2015. We derive constraints on the parameters M12, Gamma12 and Phi12 that describe D meson mixing using all available data, allowing for CP violation. We also provide posterior distributions for observable parameters appearing in D physics.

65. Charmed hadron decays at BESIII

Liaoyuan Dong (BESIII)

24/07/2015, 15:30

Flavour Physics and Fundamental Symmetries

talk

The BESIII Experiment at the Beijing Electron Positron Collider (BEPCII) has accumulated the world's largest samples of $e^{+}{e}^{-}$ collisions in the tau-charm region. Based on the samples taken at $\psi (3770)$ and $\psi (4010)$ peaks, we present the purely leptonic and semi-leptonic decays of D meson, the Dalitz analysis of $D^{+}\to K_s{\pi }^{+}{\pi }^0$ and $D^0\to K_s{K}^{+}{K}^{-}$, the $K^{-}{\pi }^{+}$ and...

313. Recent studies of CP violation in bottom and charm meson decays at Belle

Pit Vanhoefer (MPI Munich)

24/07/2015, 15:45

Flavour Physics and Fundamental Symmetries

talk

We present recent CP violation studies in B decays sensitive to the interior angles of the unitarity triangle in the Kobayashi-Maskawa scheme, ${\varphi }_2(\alpha )$ and ${\varphi }_3(\gamma )$. In addition, we present an updated CP-asymmetry measurement in charm meson decays. All measurements are based on the high statistics data set accumulated by the Belle detector at the KEKB asymmetric-energy e+e− collider.

797. Theory of Lepton Flavour Violation

Paride Paradisi (U. di Valencia)

24/07/2015, 16:30

Flavour Physics and Fundamental Symmetries

talk

Lepton Flavour Violating (LFV) processes remain among the best candidates to unveil NP effects. In this talk, I summarize LFV predictions of well motivated NP scenarios and the perspectives of detecting LFV signals in ongoing and upcoming experiments.

304. The MEG experiment: status and upgrade.

Prof. Dmitry Grigoriev (Budker Institute of Nuclear Physics (RU))

24/07/2015, 16:50

Flavour Physics and Fundamental Symmetries

talk

Lepton flavour violation (LFV) is currently one of the most exciting branches of particle physics. The flavour violating process of the neutrinoless decay of a positive muon to a positron and a gamma is strongly suppressed in the Standard Model, hence it is a very sensitive probe of new physics beyond the Standard Model. The MEG experiment searches for this process at the Paul Scherrer...

86. The Mu2e Experiment at Fermilab

Markus Roehrken (Cal Tech)

24/07/2015, 17:05

Flavour Physics and Fundamental Symmetries

talk

The Mu2e Experiment at Fermilab will search for coherent, neutrinoless conversion of muons into electrons in the field of a nucleus with a sensitivity improvement of a factor of 10,000 over previous experiments. 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...

562. COMET Experiment - A search for muon-to-electron conversion at J-PARC

Hajime Nishiguchi (KEK)

24/07/2015, 17:20

Flavour Physics and Fundamental Symmetries

talk

The COMET Experiment at J-PARC aims to search for the lepton-flavour violating (LFV) process of muon to electron conversion in a muonic atom, ${\mu }^{-}N\to {\mathrm{e}}^{-}N$, with a branching-ratio sensitivity of $6\times {10}^{-17}$, which is 4 orders of magnitude better than the present upper limit. Complemental searches for two kinds of muon LFV decay modes,...

375. The Fermilab Muon g-2 Experiment

Graziano Venanzoni (INFN)

24/07/2015, 17:35

Flavour Physics and Fundamental Symmetries

talk

The anomalous magnetic dipole moment of the muon can be both measured and computed to very high precision, making it a powerful probe to test the standard model and search for new physics such as SUSY. The previous measurement by the Brookhaven E821 experiment found a ~3 standard deviation discrepancy from the predicted value. The new g-2 experiment at Fermilab will improve the precision by a...

352. Study of the radiative tau decays, tau -> gamma l nu nubar with the BABAR detector

Roger Barlow (University of Manchester)

24/07/2015, 17:50

Flavour Physics and Fundamental Symmetries

talk

We present measurements of the branching fraction for the radiative tau leptonic decays: tau -> gamma l nu nubar, where the lepton is either a muon or an electron.  The results are obtained from an analysis of the complete BABAR data-set consisting of 430 million tau-lepton pairs, corresponding to an integrated luminosity of 468 fb^-1, collected at the PEP-II asymmetric energy e+e- collider at SLAC.

155. Measurement of the CKM angle γ at LHCb

Jordi Garra Tico (University of Cambridge (GB))

25/07/2015, 09:00

Flavour Physics and Fundamental Symmetries

talk

The angle γ is the least constrained parameter in the CKM unitarity triangle. Its determination in decays induced by tree-level b→c and b→u transitions is largely unaffected by potential new physics contributions. This allows for a consistency check of the unitarity triangle, but also of comparisons with γ determinations from modes with loop-diagrams. LHCb' γ combination for CKM 2014 already...

156. Dalitz analyses with B→Dh decays

Wenbin Qian (Centre National de la Recherche Scientifique (FR))

25/07/2015, 09:15

Flavour Physics and Fundamental Symmetries

talk

Decays of b-hadrons to states including open charm provide a rich laboratory to constrain the unitarity matrix and search for new physics. We present recent measurements in this sector, including first observations of orbitally excited D mesons, measurements of their spin, mass and decay widths.

626. NP models with extended gauge groups: Impact on flavour observables

Fulvia De Fazio (INFN Bari)

25/07/2015, 09:30

Flavour Physics and Fundamental Symmetries

talk

I discuss the predictions of models based on an extended gauge group on several rare B decays, focusing in particular on the correlations among flavour observables. Two cases are considered in details: models introducing a new Z' gauge boson and the Randall Sundrum model with custodial protection.

438. An MCMC study of non-minimal flavour violation in the MSSM

Dr Bjorn Herrmann (Unite Reseaux du CNRS (FR))

25/07/2015, 09:45

Flavour Physics and Fundamental Symmetries

talk

We present an extensive study of non-minimally flavour violating (NMFV) elements in the Lagrangian of the Minimal Supersymmetric Standard Model (MSSM). We impose a variety of theoretical and experimental constraints and perform a detailed scan of the parameter space by means of a Markov-Chain Monte-Carlo (MCMC) setup. To our knowledge, this represents the first study of several non-zero...

739. Test of the Standard model and search for new physics using Unitarity triangle fits

Guido Martinelli (Scuola Int. Superiore di Studi Avanzati (IT))

25/07/2015, 10:00

Flavour Physics and Fundamental Symmetries

talk

During the last 15 years, B-physics facilities have been giving enormous contributions to the consolidation of the Standard Model (SM) in the flavour sector. New analyses flowing from the LHC experiments, in particular LHCb, are now providing unprecedented insights into CKM metrology and new evidences for rare decays. The CKM picture can be tested with great precision, and very precise SM...

394. The Belle II experiment at the SuperKEKB collider

Jaroslaw Pawel Wiechczynski (Polish Academy of Sciences (PL))

25/07/2015, 10:20

Flavour Physics and Fundamental Symmetries

talk

The Belle II experiment at the SuperKEKB collider in Tsukuba, Japan, will start physics data taking in the year 2018 and aims at accumulating 50 ab${}^{-1}$ of $e^{+}$ $e^{-}$ collision data, about 50 times the data set of the previous Belle experiment. The physics program provides simultaneous studies of a wide range of areas in $b$-quark, $c$-quark, $\tau$-lepton, two-photon, quarkonium and exotic...

238. B Physics at CMS with Run2 and beyond

Kai-Feng Chen (National Taiwan University (NTU))

25/07/2015, 10:35

Flavour Physics and Fundamental Symmetries

talk

The LHC is entering into operation with an increased centre-of-mass energy of 13 TeV, and within the next 3 years of operations (Run2) the foreseen integrated luminosity delivered to CMS will be about 100 fb-1. The B hadron production cross section is expected to nearly double at this energy compared to Run1, thus potentially increasing by almost one order of magnitude the collected statistics...

747. Flavours at a high luminosity e+e- collider (FCC-ee)

Stephane Monteil (Univ. Blaise Pascal Clermont-Fe. II (FR))

25/07/2015, 10:50

Flavour Physics and Fundamental Symmetries

talk

A possible long-term strategy for high-energy physics at colliders considers a tunnel of about 100 km circumference, which takes advantage of the present CERN accelerator complex.A possible first step of the project is high-luminosity $e^{+}{e}^{-}$ collider aimed at studying comprehensively the electroweak scale with centre-of-mass energies ranging from the $Z$ pole up to beyond the $t...

819. Electric Dipole Moments - A Window for New Physics

Hans Stroeher (Forschungszentrum Juelich GmbH)

25/07/2015, 11:30

Flavour Physics and Fundamental Symmetries

talk

Permanent Electric Dipole Moments (EDM) of non-degenerate systems, e.g., leptons (electron, muon, tau) and hadrons (neutron, proton), provide a unique opportunity to search for physics beyond the Standard Model (BSM). Since EDMs violate P-, T-, and (via CPT) CP-symmetry they may also provide a solution to one of the biggest puzzles of contemporary physics and cosmology, i.e., the apparent...

655. NoMoS: Beyond the Standard Model Physics in Neutron Decay

Dr Gertrud Konrad (SMI Wien)

25/07/2015, 11:50

Flavour Physics and Fundamental Symmetries

talk

The newly established New Frontiers Group ‘NoMoS: Beyond the Standard Model Physics in Neutron Decay’ of the Austrian Academy of Sciences aims to search for traces of new physics in neutron beta decay with novel experimental techniques. Precision measurements in neutron decay allow searching for physics beyond the Standard Model. An accuracy of ${10}^{-4}$ in the observables corresponds to...

733. Toward a hyperfine splitting measurement of antihydrogen

Martin Simon (Austrian Academy of Sciences (AT))

25/07/2015, 12:05

Flavour Physics and Fundamental Symmetries

talk

The formation of antihydrogen opens a new avenue toward precise matter-antimatter symmetry studies through atomic spectroscopy techniques. The ASACUSA collaboration is pursuing an experiment to measure the ground-state hyperfine splitting of antihydrogen in a polarized beam [1]. For hydrogen this transition has been measured in a beam and with a maser reaching a relative precision of 4 × 10e−8...

795. PERC - A clean, bright and versatile source of neutron decay products

Bastian Maerkisch (Universität Heidelberg)

25/07/2015, 12:20

Flavour Physics and Fundamental Symmetries

talk

Neutron beta decay is an excellent system to study the charged weak interaction experimentally. The decay is precisely described by theory and unencumbered by nuclear structure effects. Observables are numerous correlation coefficients, spectra and the neutron lifetime. Precision measurements in neutron beta decay are used to investigate the structure of the weak interaction and to derive...

794. A new high sensitivity search for neutron-antineutron oscillations at the ESS

David Anthony Milstead (Stockholm University (SE))

25/07/2015, 12:35

Flavour Physics and Fundamental Symmetries

A sensitive search for neutron-antineutron oscillations can provide a unique probe of some of the central questions in particle physics and cosmology: the energy scale and mechanism for baryon number violation, the origin of the baryon-antibaryon asymmetry of the universe, and the mechanism for neutrino mass generation. A remarkable opportunity has emerged to search for such oscillations with...

347. Study of B -> K pi pi gamma decays

Gerald Eigen (University of Bergen)

25/07/2015, 12:50

Flavour Physics and Fundamental Symmetries

talk

We present a measurement of the time-dependent CP asymmetry in the radiative-penguin decay B0 -> K_S pi+ pi- gamma, using a sample of 471 million BBbar events recorded with the BaBar detector at the PEP-II e+e- collider at SLAC. We obtain the CP-violating parameters S and C in the decay, and, using new theoretical input, extract from them the time-dependent mixing-induced CP asymmetry,...