Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userOn the Case for a Super Tau-Charm Factory
70
0
0.0
(
0
)
Authors
David M. Asner
Ask ChatGPT about the research
No Arabic abstract
Design studies for a Super Flavor Factory (SFF), an asymmetric energy e+e- collider utilizing International Linear Collider (ILC) techniques and technology, are in progress. The capablity to run at center-of-mass energies near 3.770 GeV could be included in the initial design. This report discusses the physics that can be probed with luminosity of 10^{35} 1/cm^2 1/s near tau-charm threshold.
rate research
Read More
Tests of discrete symmetry violation have played an important role in understand the structure of weak interactions in the Standard Model of particle physics. Historically these measurements have been extensively performed at experiments with large samples of K and B mesons. A high luminosity tau-charm facility presents physicists with the opportunity to comprehensively explore discrete symmetry violation and test the Standard Model using tau leptons, charm mesons and charmed baryons. This paper discusses several possible measurements for a future tau-charm factory.
The present Report concerns the current status of the Italian Tau/Charm accelerator project and in particular discusses the issues related to the lattice design, to the accelerators systems and to the associated conventional facilities. The project aims at realizing a variable energy Flavor Factory between 1 and 4.6 GeV in the center of mass, and succeeds to the SuperB project from which it inherits most of the solutions proposed in this document. The work comes from a cooperation involving the INFN Frascati National Laboratories accelerator experts, the young newcomers, mostly engineers, of the Cabibbo Lab consortium and key collaborators from external laboratories.
The main physics goals of a high luminosity e+e- flavor factory are discussed, including the possibilities to perform detailed studies of the CKM mechanism of quark mixing, and constrain virtual Higgs and non-standard model particle contributions to the dynamics of rare B_u,d,s decays. The large samples of $D$ mesons and tau leptons produced at a flavor factory will result in improved sensitivities on D mixing and lepton flavor violation searches, respectively. One can also test fundamental concepts such as lepton universality to much greater precision than existing constraints and improve the precision on tests of CPT from B meson decays. Recent developments in accelerator physics have demonstrated the feasibility to build an accelerator that can achieve luminosities of O(10^36) cm^-2 s^-1.
The present data imply that $phi(2170)$ may not be an excited state of $phi$, but is a four quark state with $ssbar s bar s$ constituents. Furthermore, there are no two mesons of $sbar s$ available to form a molecule which fits the mass spectrum of $phi(2170)$, thus we suggest it should be an $ssbar s bar s$ tetraquark state. In this scenario, we estimate its decay rates through the fall-apart mechanism. Our theoretical estimates indicate that its main decay modes should be $phi(2170)$ into $phi f_0(980)$, $ h_1eta$, $ h_1eta$, $K_1(1270)K$ and $K_1(1400)K$. Under this hypothesis the modes $phi(2170)to K^*(890)^0bar K^*(890)^0$, $K^+K^-$ and $K^0_LK^0_S$ should be relatively suppressed. Since the width of $h_1$ is rather large, at present it is hard to gain precise data on $BR(phi(2170)to h_1eta)$ and $BR(phi(2170)to h_1eta)$ whose measurements may be crucial for drawing a definite conclusion about the inner assignment of $phi(2170)$. We lay our expectation to the proposed charm-tau factory which will have much larger luminosity and better capacities.
We report a feasibility study of $CP$ violation of $tau^{-}rightarrow K_{S}pi^{-} u_{tau}$ decay at a Super Tau Charm Facility~(STCF).With an expected luminosity of 1~ab$^{-1}$ collected by STCF per year at a center-of-mass energy of 4.26 GeV, the statistical sensitivity for the $CP$ violation is determined to be of order $9.7times10^{-4}$ by measuring the decay-rate difference between $tau^{+}rightarrow K_{S}pi^{+}bar{ u}_{tau}$ and $tau^{-}rightarrow K_{S}pi^{-} u_{tau}$. The analysis is performed using a reliable fast simulation software package, which can describe the detector responses properly and vary the responses flexibly for further optimization. Moreover, the energy-dependent efficiencies for reconstructing $tau^{-}rightarrow K_{S}pi^{-} u_{tau}$ are presented and the expected $CP$ sensitivity is proportional to $1/sqrt{mathcal{L}}$ in the energy region from 4.0 to 5.0 GeV. The sensitivity of $CP$ violation is of order $3.1times10^{-4}$ with 10~ab$^{-1}$ integrated luminosity, which is equivalent to ten years data taking in this energy region at STCF.
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
