BaBar Collaboration first to see anomaly

Nature ◽  
2017 ◽  
Vol 548 (7665) ◽  
pp. 31-31
Author(s):  
Tom Browder ◽  
Giovanni Passaleva ◽  
Michael Roney
Keyword(s):  
Babar Collaboration

scholarly journals RECENT τ LEPTON RESULTS FROM BABAR

2014 ◽  
Vol 35 ◽  
pp. 1460440
Author(s):  
ALBERTO LUSIANI
Keyword(s):  
Standard Model ◽  
Branching Fractions ◽  
Charged Particles ◽  
Babar Collaboration ◽  
Final States ◽  
Final State ◽  
Experimental Knowledge ◽  
Electron Positron ◽  
The Standard Model ◽  
Positron Collisions

We report recent measurements on τ leptons obtained by the BABAR collaboration using the entire recorded sample of electron-positron collisions at and around the Υ(4S) (about 470fb-1). The events were recorded at the PEP-II asymmetric collider at the SLAC National Accelerator Laboratory. The measurements include high multiplicity τ decay branching fractions with 3 or 5 charged particles in the final state, a search for the second class current the τ decay τ → πη′ν, τ branching fractions into final states containing two KS mesons, [Formula: see text], with h = π, K, and preliminary measurements of hadronic spectra of τ decays with three hadrons (τ- → h-h+h-ντ decays, where h = π, K). The results improve the experimental knowledge of the τ lepton properties and can be used to improve the precision tests of the Standard Model.

scholarly journals Recent results from BABAR

2020 ◽  
Vol 235 ◽  
pp. 04001
Author(s):  
J. William Gary
Keyword(s):  
Data Collection ◽  
Direct Measurement ◽  
Decay Channel ◽  
Branching Fraction ◽  
Branching Fractions ◽  
Babar Collaboration ◽  
Lepton Number ◽  
Lepton Flavor ◽  
The Third

The BABAR Collaboration at SLAC continues to produce a wide variety of publications on interesting and unique topics despite having ceased data-collection operations more than 10 years ago. Presented here are the results of three recent studies. The first is on the direct measurement of the B± → K± X(3872) branching fraction, allowing the first determination of the branching fractions of the exotic X(3872) charmonium state. The second is a publication on the first observation of the D0 → K−π+e+e− branching fraction. The third is on searches for lepton flavor and lepton number violating decays in D0 meson decays, resulting in improvements over existing limits by factors that vary from 20 to almost 800 depending on the D0 decay channel.

THE CHARMED PENTAQUARK Θc(3250) FROM QCD SUM RULES

2014 ◽  
Vol 26 ◽  
pp. 1460109
Author(s):  
MARINA NIELSEN ◽  
RAPHAEL M. ALBUQUERQUE ◽  
SU HOUNG LEE
Keyword(s):  
Sum Rules ◽  
Decay Channel ◽  
Babar Collaboration ◽  
Leading Order ◽  
Qcd Sum Rules ◽  
Sum Rule

We study, using the QCD sum rule framework, the possible existence of a charmed pentaquark that we call Θc(3250). In the QCD side we work at leading order in αs and consider condensates up to dimension 10. The mass obtained: mΘc = (3.21±0.13) GeV, is compatible with the mass of the structure seen by BaBar Collaboration in the decay channel [Formula: see text].

scholarly journals WHY X(3915) IS SO NARROW AS A χc0(2P) STATE?

2013 ◽  
Vol 28 (28) ◽  
pp. 1350145 ◽  
Author(s):  
YUE JIANG ◽  
GUO-LI WANG ◽  
TIANHONG WANG ◽  
WAN-LI JU
Keyword(s):  
Wave Function ◽  
Quantum Chromodynamics ◽  
Decay Width ◽  
Babar Collaboration ◽  
Wave Functions ◽  
Final States ◽  
Full Width ◽  
Matrix Elements ◽  
Narrow Width ◽  
Open Question

New resonance X(3915) was identified as the charmonium χc0(2P) by BaBar Collaboration, but there still seems an open question of this assignment: why its full width is so narrow? To answer this question, we calculate the Okubo–Zweig–Iizuka (OZI)-allowed strong decays [Formula: see text], where X(3915) is assigned as a χc0(2P) state, and estimate its full width in the cooperating framework of 3P0 model and the Bethe–Salpeter (BS) method using the Mandelstam formalism, during which nonperturbative quantum chromodynamics (QCD) effects of the hadronic matrix elements are well-considered by overlapping integral over the relativistic Salpeter wave functions of the initial and final states. We find the node structure of χc0(2P) wave function resulting in the narrow width of X(3915) and show the dependence of the decay width on the variation of the initial mass of X(3915). We point out that the rate of [Formula: see text] is crucial to confirm whether X(3915) is the χc0(2P) state or not.

Determination of the magnetic dipole moment of the rho meson using four-pion electroproduction data

2015 ◽  
Vol 30 (18n19) ◽  
pp. 1550114 ◽  
Author(s):  
D. García Gudiño ◽  
G. Toledo Sánchez
Keyword(s):  
Dipole Moment ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Center Of Mass ◽  
Babar Collaboration ◽  
Vector Meson Dominance ◽  
Dominance Model ◽  
Rho Meson ◽  
Center Of Mass Energy ◽  
Vector Meson Dominance Model

We determine the magnetic dipole moment of the rho meson using preliminary data from the BaBar Collaboration for the [Formula: see text] process, in the center of mass energy range from 0.9 to 2.2 GeV. We describe the [Formula: see text] vertex using a vector meson dominance model, including the intermediate resonance contributions relevant at these energies. We find that [Formula: see text] in [Formula: see text] units.

Ds DALITZ PLOT ANALYSES FROM THE B-FACTORIES

2011 ◽  
Vol 02 ◽  
pp. 67-71
Author(s):  
◽  
MARK CONVERY
Keyword(s):  
Dalitz Plot ◽  
Babar Collaboration ◽  
Interference Effects ◽  
Charm Meson ◽  
Meson Decays ◽  
Yield Information ◽  
Intermediate States ◽  
Three Body ◽  
Scalar Resonances

The resonant sub-structure of three-body charm meson decays can be effectively studied with Dalitz plot analyses. By using coherent sums of amplitudes, interference between different intermediate states can be described. Such interference effects can yield information on states, such as the scalar resonances, that is difficult to obtain in other ways. In this summary, we report on BABAR collaboration Dalitz plot analyses of two modes: [Formula: see text] and [Formula: see text].

scholarly journals A no-go theorem for non-standard explanations of the $\tau\to K_S\pi\nu_\tau$ CP asymmetry

2019 ◽  
Author(s):  
Vincenzo Cirigliano ◽  
Andreas Crivellin ◽  
Martin Hoferichter
Keyword(s):  
Final State Interaction ◽  
Babar Collaboration ◽  
Tensor Interaction ◽  
Beyond The Standard Model ◽  
Neutron Electric Dipole Moment ◽  
Final State ◽  
Cp Asymmetry ◽  
Strong Phase ◽  
The Standard Model ◽  
Bsm Physics

A new tensor interaction is the only possibility to explain the \boldsymbol{2.8\sigma}2.8𝛔 tension observed by the BaBar collaboration in the CP asymmetry in \boldsymbol{\tau\to K_S\pi\nu_\tau}𝛕→𝐊𝐒𝛑𝛎𝛕 with physics beyond the Standard Model (BSM) realized above the electroweak scale. However, the strong phase generated by the interference between vector and tensor phases is suppressed by at least two orders of magnitude due to Watson’s final-state-interaction theorem, and the strength of the CP-violating tensor interaction is strongly constrained by bounds from the neutron electric dipole moment and \boldsymbol{D}𝐃–\boldsymbol{\bar{D}}𝐃‾ mixing. As a result, a confirmation of the tension at Belle II would point to light BSM physics.

scholarly journals Distributing File-Based Data to Remote Sites Within the BABAR Collaboration

2002 ◽  
Author(s):  
Stephen J Gowdy
Keyword(s):  
Babar Collaboration ◽  
Remote Sites

scholarly journals Semi-leptonic production of DsJ(3040) and DJ(3000) in Bs and B decays

2017 ◽  
Vol 32 (03) ◽  
pp. 1750013 ◽  
Author(s):  
Si-Chen Li ◽  
Yue Jiang ◽  
Tian-Hong Wang ◽  
Qiang Li ◽  
Zhi-Hui Wang ◽  
...  
Keyword(s):  
Quantum Number ◽  
Branching Ratios ◽  
Lhcb Collaboration ◽  
Babar Collaboration ◽  
B Decays ◽  
Leptonic Decays ◽  
Number Formula

In this paper, we study the productions of the newly detected states [Formula: see text] and [Formula: see text] observed by BaBar Collaboration and LHCb Collaboration. We assume these states to be the [Formula: see text] and [Formula: see text] states with the quantum number [Formula: see text] in our work. The results of improved Bethe–Salpeter (BS) method indicate that the semi-leptonic decays via [Formula: see text] and [Formula: see text] into [Formula: see text] and [Formula: see text] have considerable branching ratios, for example, [Formula: see text], [Formula: see text], which shows that these semi-leptonic decays can be accessible in experiments.

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