27-28 March 2017
ES building, Higashiyama Campus, Nagoya University
Japan timezone
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Displaying 26 contributions out of 26
We report on the first observation of the narrow D1(2420) and D2(2460) states and improved measurement of the broad D1(2430) in the color-suppressed B0bar -> D**0 omega, D**0 -> D*+ pi- decay.
Presented by Dmitry MATVIENKO on 28 Mar 2017 at 11:30
Presented by Aida EL-KHADRA on 27 Mar 2017 at 15:10
LHCb can measure the branching fraction of B->D*taunu with tau->3pi relative to that of B->D*3pi. Making this measurement comparable with R(D*) requires an absolute measurement of the branching fraction of B->D*3pi. I will describe a recent measurement of this normalization decay from BABAR. In addition, I will discuss some new ideas for future studies of b->ctaunu decays at Belle II.
Presented by Abner SOFFER on 28 Mar 2017 at 10:55
Based on the full BABAR data set, measurements of the decay rates for B meson decays involving τ leptons will be presented. The results will be compared to Standard Model predictions, and first attempts to interpret the observed excess of events will be discussed.
Presented by Vera LUTH on 27 Mar 2017 at 11:20
We investigate a new constraint on new-physics interpretations of the anomalies observed in B -> D^(*) tau nu decays making use of the lifetime of the B_c meson. A constraint is obtained by demanding that the rate for B_c -> tau nu does not exceed the fraction of the total width that is allowed by the calculation of the lifetime in the standard model. The new constraint renders a scalar interpret ... More
Presented by Benjamin GRINSTEIN on 27 Mar 2017 at 18:00
The decays B -> tau nu and B -> D(*) tau nu are the type of (semi)leptonic decays with a tau lepton in the final state. Owing to the massive tau lepton, these decays are sensitive to new physics having an enhanced coupling to the tau lepton, such as the charged Higgs boson in type-II Two-Higgs-Doublet Model. Using the clean environment of e^+ e^- collisions at the center-of-mass energy of 10.58 Ge ... More
Presented by Shigeki HIROSE on 27 Mar 2017 at 11:55
on 28 Mar 2017 at 16:50
We will explore the possibility that the anomalies in the charged current b-> c tau nu_tau and the b-> s ll anomalies have a common origin. This leads to interesting predictions like Upsilon to tau mu and other decays. I will also mention how the measurement of Lambda_b to Lambda_c tau nu decays can shed light on the B-> D^(*) tau nu_tau decays.
Presented by Alakabha DATTA on 28 Mar 2017 at 15:05
We are developing the MC event generator of B->D(*)taunu decays including new physics effects as a evtgen decay module for the Belle/BelleII physics analysis, based on the theoretical calculation by M. Tanaka and R. Watanabe, PhysRevD87, 034028 (2013). We report some results of the developed generator.
Presented by Koji HARA on 28 Mar 2017 at 12:05
I will discuss the possibility of a new approach to the measurement B->D*taunnu using semileptonic tags. Through application of the recursive jigsaw reconstruction we may be able to partition the missing mass in events and find additional new variables to characterise the signal. I will introduce the conceptual idea behind the topic and discuss future plans for application within Belle II. Further ... More
Presented by Paul JACKSON on 28 Mar 2017 at 12:40
Presented by Elisabetta BARBERIO on 28 Mar 2017 at 15:40
We study the implications of the long-standing anomaly in semi-tauonic B meson decays for direct searches with ATLAS and CMS detectors at the LHC. We first identify collider signatures at high energies correlated with the anomaly at low energies. Several representative models put forward to explain the anomaly are examined in details: color-neutral vector triplet, 2HDM, scalar and vector leptoquar ... More
Presented by Admir GRELJO on 28 Mar 2017 at 16:15
Presented by Benedetto Gianluca SIDDI on 27 Mar 2017 at 10:45
Measurements of B -> D^(*) tau nu where the tau decays leptonically are sensitive to our understanding of background from semileptonic B decays to a D or D^* meson and one or more additional hadrons (X). Decays where X is a single pi are relatively well measured, but only one measurement has been made where X is a pi^+pi^- system and no measurements have been made where X is pipi^0, 3pi, eta or o ... More
Presented by Robert KOWALEWSKI on 28 Mar 2017 at 09:55
Presented by Minoru TANAKA on 27 Mar 2017 at 16:15
I discuss results of a new combined fit to the B->D(∗)lν decay distributions to predict the B->D(∗)τν rates and determine the CKM matrix element |Vcb|. Past theoretical and experimental papers neglected uncertainties in the predictions for form factor ratios at order 1/m, which we include. We study in detail the theoretical uncertainties in the SM predictions for R(D) and R(D*). We calcu ... More
Presented by Zoltan LIGETI on 27 Mar 2017 at 08:45
Presented by Greg CIEZAREK on 27 Mar 2017 at 10:10
Presented by Guglielmo DE NARDO on 27 Mar 2017 at 14:00
Presented by Phillip URQUIJO on 27 Mar 2017 at 14:35
Semileptonic B meson decays into the four lightest excited charmed meson states (D∗0, D∗1, D1, and D∗2) and their counterparts with s quarks are investigated, including the full lepton mass dependence. We derive the standard model predictions for the differential branching fractions, as well as predictions for the ratios of the semi-tauonic and light lepton semileptonic branching fractions. ... More
Presented by Florian BERNLOCHNER on 28 Mar 2017 at 09:20
Given on behalf of the LHCb collaboration: Should the discrepancy between theoretical predictions and measurements of R(D*) and R(D) persist with new data at LHCb and Belle II it will be important to measure lepton non-universality in transitions other than b->c in order to characterise the underlying physics causes. With the large dataset of semi-leptonic decays collected by LHCb in Run 1 and Ru ... More
Presented by Mark SMITH on 28 Mar 2017 at 14:30
It has been long-standing that measurements of B -> D(*) tau nu deviate from SM predictions. There have been lots of studies for new physics which can accommodate the discrepancy. An important point is that how we can probe or confirm a true theory behind the deviation. In this talk, based on my recent studies, I will show three ways of probing new physics that can explain the deviation in -> D( ... More
Presented by Ryotaro WATANABE on 27 Mar 2017 at 16:50
Experimental measurements of the ratios R(D(*))=Gamma(B -> D(*) tau nu) / Gamma(B -> D(*) l nu) (l=e, mu) show a 3.9 sigma deviation from the Standard Model prediction. In the absence of light right-handed neutrinos, a new physics contribution to b -> c tau nu decays necessarily modifies also b-bar b -> tau^+ tau^- and/or c-bar c -> tau^+ tau^- transitions. These contributions lead to violation of ... More
Presented by Daniel ALONI on 27 Mar 2017 at 17:25
Presented by Toru IIJIMA on 27 Mar 2017 at 10:00