scholarly journals Prospects for $\tau$ lepton physics at Belle II

2019 ◽  
Author(s):  
Michel Enrique Hernandez Villanueva
Keyword(s):  
Precision Measurements ◽  
Model Parameters ◽  
Lepton Production ◽  
Lepton Flavor ◽  
Belle Detector ◽  
Physics Program ◽  
Electron Positron ◽  
Belle Ii ◽  
Positron Collisions ◽  
Broad Program

The Belle II experiment is an upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e^+e^-e+e− collider. The accelerator has already successfully completed the first phase of commissioning and first electron positron-collisions in Belle II were observed in April 2018. The design luminosity of SuperKEKB is 8x10^{35}35 cm^{-2}−2s^{-1}−1 and the Belle II experiment aims to record 50 ab^{-1}−1 of data. Belle II has a broad program of \tauτ physics, in particular, precision measurements of Standard Model parameters and searches of lepton flavor and lepton number violations, benefiting from the large cross-section of the pairwise \tauτ lepton production in e^+e^-e+e− collisions. In this talk, we will review the \tauτ lepton physics program of Belle II.

scholarly journals Data quality monitors of vertex detectors at the start of the Belle II experiment

2020 ◽  
Vol 245 ◽  
pp. 01035
Author(s):  
Peter Kodyš ◽  
Jesus Abudinen ◽  
Karlheinz Georg Ackermann ◽  
Karol Mateusz Adamczyk ◽  
Patrick Ahlburg ◽  
...  
Keyword(s):  
Data Quality ◽  
Quality Monitoring ◽  
Software Framework ◽  
Phase 2 ◽  
Full Data ◽  
Vertex Detector ◽  
Belle Detector ◽  
Electron Positron ◽  
Belle Ii ◽  
Positron Collisions

The Belle II experiment features a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e+e− collider at KEK in Tsukuba, Japan. The accelerator completed its first phase of commissioning in 2016, and the Belle II detector saw its first electron-positron collisions in April 2018. Belle II features a newly designed silicon vertex detector based on double-sided strip layers and DEPFET pixel layers. A subset of the vertex detector was operated in 2018 to determine background conditions (Phase 2 operation). The collaboration completed full detector installation in January 2019, and the experiment started full data taking. This paper will report on the final arrangement of the silicon vertex detector part of Belle II with a focus on online monitoring of detector conditions and data quality, on the design and use of diagnostic and reference plots, and on integration with the software framework of Belle II. Data quality monitoring plots will be discussed with a focus on simulation and acquired cosmic and collision data.

scholarly journals Recent results on Kaon Physics at KLOE-2

2019 ◽  
Vol 212 ◽  
pp. 09001 ◽  
Author(s):  
Alessandro Di Cicco
Keyword(s):  
Discrete Symmetries ◽  
Charge Asymmetry ◽  
Kaon Physics ◽  
Neutral Kaon ◽  
Meson Mass ◽  
Physics Program ◽  
Neutral Kaons ◽  
Electron Positron ◽  
The Status ◽  
Positron Collisions

KLOE-2 extends the physics program of the forerunner KLOE experiment, especially in the field of discrete symmetries tests with neutral kaons. KLOE and KLOE-2 have collected together the largest sample of electron-positron collisions at an energy equal to the φ-meson mass, corresponding to about 2.4×1010 produced φ mesons. The latest results on neutral kaon physics at KLOE will be reviewed, together with the status and prospects of the analyses of KLOE-2 data. A new measurement of the charge asymmetry in KS semileptonic decays with 1.7 fb−1 of KLOE data, which improves the sensitivity of previous measurements of about a factor two, will be presented. Furthermore, the status of the analysis devoted to directly test T and CPT symmetries in neutral kaons transitions, as well as the search of the pure CP-violating KS → 3π0 decay using part of the recently acquired KLOE-2 dataset, will be presented.

scholarly journals Towards TeV-scale electron-positron collisions: the Compact Linear Collider (CLIC)

2018 ◽  
Vol 49 (1) ◽  
pp. 24-28
Author(s):  
Steffen Doebert ◽  
Eva Sicking
Keyword(s):  
Linear Collider ◽  
Precision Measurements ◽  
Electron Positron ◽  
Positron Collisions ◽  
Energy Frontier ◽  
New Phenomena ◽  
The Universe

The Compact Linear Collider (CLIC), a future electron-positron collider at the energy frontier, has the potential to change our understanding of the universe. Proposed to follow the Large Hardron Collider (LHC) programme at CERN, it is conceived for precision measurements as well as for searches for new phenomena.

scholarly journals Single heavy lepton production in high energy electron-positron collisions

1995 ◽  
Vol 51 (11) ◽  
pp. 5990-5995 ◽  
Author(s):  
F. M. L. Almeida ◽  
J. H. Lopes ◽  
J. A. Martins Simões ◽  
P. P. Queiroz Filho ◽  
A. J. Ramalho
Keyword(s):  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Lepton Production ◽  
Heavy Lepton ◽  
Electron Positron ◽  
Positron Collisions

scholarly journals The Belle II Experiment: Status and Prospects

Universe ◽  
2018 ◽  
Vol 4 (10) ◽  
pp. 101 ◽  
Author(s):  
Paolo Branchini
Keyword(s):  
Large Dataset ◽  
Detector Performance ◽  
Belle Detector ◽  
Belle Ii ◽  
Belle Experiment ◽  
Positron Collisions

The Belle II experiment is a substantial upgrade of the Belle detector and will operate at the SuperKEKBenergy-asymmetric e + e − collider. The accelerator has already successfully completed the first phase of commissioning in 2016. The first electron versus positron collisions in Belle II were delivered in April 2018. The design luminosity of SuperKEKB is 8 × 10 35 cm−2s−1, and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than the Belle experiment. This large dataset will be accumulated with low backgrounds and high trigger efficiencies in a clean e + e − environment. This contribution will review the detector upgrade, the achieved detector performance and the plans for the commissioning of Belle II.

scholarly journals Electro-weak production of pseudovector C-even heavy quarkonia in electron-positron collisions on Belle II and BES III

2019 ◽  
Vol 212 ◽  
pp. 02001 ◽  
Author(s):  
Nikolay Achasov
Keyword(s):  
Heavy Quarkonia ◽  
Electron Positron ◽  
Belle Ii ◽  
Positron Collisions

1. The X(3872) State as Charmonium χc1(2P) 2. The χc1 and χb1 production in the e+e−→ χc1/χb1 reaction

scholarly journals Belle II virtual reality projects

2019 ◽  
Vol 214 ◽  
pp. 02028
Author(s):  
Michael Bender ◽  
Thomas Kuhr ◽  
Leo Piilonen
Keyword(s):  
Virtual Reality ◽  
Precise Measurement ◽  
Beyond The Standard Model ◽  
Head Mounted Display ◽  
Electron Positron ◽  
The Standard Model ◽  
Education And Outreach ◽  
Belle Ii ◽  
Lepton Decays ◽  
Positron Collisions

The Belle II experiment, based in Japan, is designed for the precise measurement of B- and charm-meson as well as τ-lepton decays and is intended to play an important role in the search for physics beyond the Standard Model. To visualize the collected data, amongst other things, virtual reality (VR) appli-cations are used within the collaboration. In addition to the already existing VR application which runs on a head-mounted display (HMD), an implementation for the cave automatic virtual environment (CAVE) has been created, where the CAVE is an immersive VR environment, in which projectors are directed to up to six walls of a room-sized cube. These VR applications allow for the inspection of the Belle II detector itself, as well as the illustration of GEANT4 simulated (and data) events of the electron-positron collisions occurring at the SuperKEKB collider. The VR implementations are not only limited to the use within the Belle II collaboration, but are a helpful tool in education and outreach activities.

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.

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