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The Charm Physics Potential of a Tau-Charm Factory  [PDF]
J. L. Hewett
Physics , 1994,
Abstract: The charm physics program accessible to a Tau-Charm Factory is summarized. Semileptonic, leptonic, hadronic, rare and forbidden charm decay modes are discussed, as well as \dmix\ mixing and CP violation in the charm sector. The theoretical expectations in the Standard Model and beyond as well as the experimental capabilities of a Tau-Charm Factory are examined for each of the above processes. {To appear in {\it The Tau-Charm Factory in the Era of B-Factories and CESR}, Stanford, CA, August 15-16, 1994}
High-Impact Charm Physics at the Turn of the Millennium  [PDF]
Daniel M. Kaplan
Physics , 1995, DOI: 10.1063/1.49274
Abstract: I review the sensitivities achieved by and projected for fixed-target charm experiments in CP violation, flavor-changing neutral-current and lepton-number-violating decays, and mixing, and I describe the Charm2000 experiment intended to run at Fermilab in the Year ~2000. If approved, Charm2000 will in many of these areas exceed the sensitivities projected for a Tau/Charm Factory, but the Tau/Charm Factory retains certain qualitative advantages.
Tests at a Tau/Charm Factory with Longitudinally Polarized Beams  [PDF]
Charles A. Nelson
Physics , 1996,
Abstract: In a recent paper, eight semileptonic parameters were defined to specify the most general Lorentz-invariant spin correlation functions for tau semileptonic decays. The parameters were physically defined in terms of tau-decay partial-width intensities for polarized final states. This paper studies how these parameters can be simply measured at a tau/charm factory with longitudinally polarized beams without using spin-correlation techniques. Thereby the parameters can also be used to bound the effective-mass scales $ \Lambda $ for ``new physics" such as arising from lepton compositeness, leptonic CP violation, leptonic T violation, tau weak magnetism, weak electricity, and/or second-class currents.
D^0 \to K^{\pm}π^{\mp} and CP Violation at a τ-charm Factory  [PDF]
Zhi-zhong Xing
Physics , 1995, DOI: 10.1016/0370-2693(96)00077-9
Abstract: We calculate the time-dependent and time-integrated decay rates of $(D^0\bar{D}^0)\rightarrow (K^{\pm}\pi^{\mp})(l^{\pm}X^{\mp})$ at the $\psi(3.77)$ and $\psi(4.14)$ resonances. The possibilities to distinguish between the effects of $D^0-\bar{D}^0$ mixing and doubly Cabibbo suppressed decay (DCSD) are illustrated, and the signal of $CP$ violation induced by the interplay of mixing and DCSD is discussed. Ratios of the decay rates of $(D^0\bar{D}^0)\rightarrow (K^{\pm}\pi^{\mp})(K^{\pm}\pi^{\mp})$ to that of $(D^0\bar{D}^0)\rightarrow (K^+\pi^-)(K^-\pi^+)$ are also recalculated by accommodating $CP$ violation and final-state interactions.
Yung Su Tsai
Physics , 1995, DOI: 10.1063/1.49284
Abstract: The $\tau^\pm$, highly polarized in the direction of the incident beam, can be obtained from the $e^\pm$ collider with the polarized incident $e^-$ (and preferably also the $e^+$) beam. This polarization vector $\longvec w_i=(w_1+w_2)/(1+w_1w_2) \widehat e_z$ can be used to construct the $T$ odd rotationally invariant product $(\longvec w_i\times\longvec p_\mu)$. $\longvec w_\mu$, where $w_1$ and $w_2$ are longitudinal polarization vectors of $e^-$ and $e^+$ respectively; $\longvec p_\mu$ and $\longvec w_\mu$ are the momentum and polarization of the muon in the decay $\tau^-\rarrow \mu^-+ \bar\nu_\mu+\nu_\tau$. T is violated by the existence of such a term. CP can be tested by comparing it with a similar term in $\tau^+$ decay. If T violation in such a decay is milliweak or stronger, one can find it using the proposed polarized $\tau$-charm factory with luminosity of $1 \sim 3 \times 10^{33}/\cm^2/\sec$. One can test whether T (and CP) violation is due to the charged Higgs boson exchange by doing a similar experiment for the $\mu^\pm$ decay.
Tau and Charm physics highlights  [PDF]
P. Roudeau
Physics , 2001, DOI: 10.1142/S0217751X02012582
Abstract: In tau physics, we are at the frontier between the completion of the LEP program and the start of analyses from b-factories, which are expected to produce results in the coming years. Nice results from CLEO are steadily delivered in the meantime. For charm, impressive progress have been achieved by fixed target experiments in the search for CP violation and D^0 - \bar D^0 oscillations. First results from b-factories demonstrate the power of these facilities in such areas. The novel measurement of the D* width by CLEO happens to be rather different from current expectations. The absence of a charm factory explains the lack or the very slow progress in the absolute scale determinations for charm decays.
Testing discrete symmetries at a super tau-charm factory  [PDF]
A. J. Bevan
Physics , 2015,
Abstract: 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.
Addendum to the Test of CP Violation in Tau Decay  [PDF]
Yung Su Tsai
Physics , 1995, DOI: 10.1063/1.49259
Abstract: We discuss the test of CP and CPT violation in $\tau$ decay without using the polarized electron beam by comparing partial fractions of $\tau^-$ and $\tau^+$ decay into channels with strong final state interactions. For example, $\Gamma(\tau^-\rarrow \pi^-+\pi^0+\nu) \ne \Gamma(\tau^+\rarrow \pi^++\pi^0+\nu)$ signifies violation of CP. The optimum energy to investigatge CP violation in $\tau$ decay is discussed. We conclude that this energy is a few MeV below $\psi(2s)$ in order to avoid the charm contribution and over abundance of hadrons at the $\psi(2s)$ peak.
Charm mixing and CP violation  [PDF]
Alberto Correa dos Reis
Physics , 2014,
Abstract: Experimental results on charm mixing and CP violation searches are reviewed. This paper focus on results released after FPCP 2013.
CP Violation in Charm  [PDF]
Kevin Stenson
Physics , 2002,
Abstract: Recent results on searches for CP and CPT violation in the charm sector are presented. These results include limits on direct CP violation in several channels from the FOCUS and CLEO experiments. The first reported search for CPT violation in charm, a preliminary result by the FOCUS collaboration, is also presented.
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