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New physics may show itself in vector portal via the kinetic mixing of the ordinary photon with the dark one. For very light dark photon its production in particle collisions occur via oscillations with the ordinary photon. We discuss probability of light dark photon production and its possible signatures at collider experiments.
We presented new technique of the measurement cross section at
This work is dedicated to measurement of the strong phases difference between the Cabibbo favoured and doubly Cabibbo suppressed decays of the neutral D-meson for extraction of the D0 anti-D0 mixing parameters. Key feature of this new method is the reconstruction of the neutral kaon (D0->K0 pi0) in semileptonic final state. Using this method time-dependent decay rate of the kaon can provide us with information about strong phase difference. To estimate potential accuracy we perform a feasibility study.
The large data sets a SCTF facility will produce will new opportunities for Partial-Wave Analyses (PWA) of various final states, of which we will study two example cases.
For
In D meson decays, how PWA can help to extract CP violating effects and introduce a method to perform such an analysis in a model-independent way, exceeding the model independence of common MIPWA approaches.
We present a feasibility study of muon polarization measurement to extract the Michel parameter
Michel parameters (MP) determine the Lorentz structure of the charged weak interaction, they are in the list of the basic properties of every lepton. The difference of the measured MP from their Standard Model expectation will exhibit clear signature of the New Physics. Feasibility study of Michel parameters at the Super Charm-Tau factory and Belle II with polarized electron beam has been carried out. This simple generator level study allows us to estimate the statistical sensitivities to MP as a function of electron beam polarization. Two analysis techniques were tested: the unbinned maximum likelihood fit of the (tau --> lep nu nu; tau --> pi pi0 nu) events in the full nine-dimensional phase space, and unbinned maximum likelihood fit of the (tau --> lep nu nu; tau --> all) in the three-dimensional phase space. Sensitivities to MP were estimated for the whole expected Super Charm-Tau factory and Belle II tau data samples. The impact of the electron beam polarization at the Super Charm-Tau factory is discussed.
Recent results of high-statistics studies of the tau -> K pi nu decays at e+ e- B factories, Belle and BABAR, are reviewed. Complementary searches for CP symmetry violation in the tau -> K_S pi (>= 0 pi0) nu decays at BABAR and tau -> K_S pi nu at Belle are discussed. The new technique to search for CPV in tau -> K_S pi nu decay is proposed where the CPV phase is extracted in the unbinned maximum likelihood fit of the (tau -> K_S pi nu; tau -> pi pi0 nu) events in the 12-dimensional phase space. The impact of the electron beam polarization at the Super Charm-Tau factory is analyzed.
In order to guarantee an excellent PID at SCTF, two Cherenkov counters are proposed as one possible design option of the final SCTF detector. Both detectors use the method of detection of internally reflected Cherenkov light, what is called the DIRC concept. The main purpose of these DIRCs is to separate pions and muons up to a momentum of 1 GeV/c with a
Two endcap DIRCs are proposed that cover the forward and backward regions. They consist of a thin fused silica radiator plate each, with attached focusing optics. A third DIRC detector, that will contain fused silica bars and expansion volumes, is going to be designed in a barrel shape around the
This talk will mainly cover the simulation studies that are currently ongoing, which aim to optimize the performance of these detectors with respect to the Cherenkov angle resolution and timing information. The results of these simulations will be used to identify the best optical parameters and readout systems for both detectors. According to the actual plan, silicon photomultipliers (SiPMs) with a high granularity are going to be used to measure single Cherenkov photons. Special optics is going to be required for obtaining a high detector resolution. In addition to that, it will be important to use fast readout electronics to correct for dispersion effects of the created Cherenkov light in fused silica.
We developed Aerogel RICH (ARICH) detector as a forward endcap PID detector in the Belle II spectrometer. ARICH consists of 248 aerogel tiles as radiators and 420 Hybrid Avalanche Photodetectors (HAPDs) as photon detectors. Belle II conducted the commissioning operation in 2018, and then started the physics run this year. In this presentation, the operation and experience as well as the initial performance of the ARICH detector is reported.
Modern high luminosity e+ e- factory requires fast electromagnetic calorimeter to collect the data efficiently at high trigger rates and suppress severe beam background. The prototype of the calorimeter for the Super Charm-Tau factory based on pure CsI scintillation crystals, wavelength shifters with the novel nanostructured organosilicon luminophores, and avalanche photodiodes Hamamatsu S8664-55 is discussed. The results of the beam test of the basic element of the calorimeter are reported. Simulation of the calorimeter response is also briefly discussed.
Large Area Picosecond Photodetectors (LAPPD) are a new generation of microchannel plate based photomultipliers being manufactured by Incom. These devices feature large sensitive area of 350
A common bus tour to Moscow downtown, visit to Kremlin, Red Square and St. Basil Cathedral.
Please put on warm clothes, as part of the visit to Kremlin and Red Square involves a walk outdoors. The expected day temperature is +11°C, night temperature — +1°C.