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Search Results: 1 - 10 of 500634 matches for " C. S. Kim "
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Optimal Policies for Managing Invasive Species under Uncertainty  [PDF]
C. S. Kim, Marcel Aillery, Jan Lewandrowski, SeungGyu Kim
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330195
Abstract: We present an optimal control model of three stages of resources allocation for managing invasive species. Three types of temporal uncertainty are considered, involving the timing of discovery of an invasive pest, the timing of an induced technology development after the establishment and dispersion of an invasive species, and the timing of farmer adoption of induced technology as the costs of controlling the invasive species increase. Using a bioeconomic optimal control model of managing invasive species, where models in previous studies are subset within our model, we show that when sub-structured models not including all three stages are used for managing invasive species, resource allocation for adopting preventive measures before the initial discovery of an invasive pest would be supra-optimalwhile resource allocation for adopting conventional control measures after establishment and dispersion would be sub-optimal.
Is CDF large $p_T$ anomaly from virtual SUSY threshold effects?
C. S. Kim
Physics , 1997,
Abstract: Talk is given at the YITP International Workshop -- `Recent Developments in QCD and Hadron Physics'. Recent CDF data of the inclusive jet cross section shows anomalous deviation around large transverse momentum $p_{T}(j)\approx 200 \sim 350$ GeV. Is it possible to interpret the anomaly in terms of virtual SUSY effects. The answer is `NO', because we find that the virtual SUSY loop interference effects are too small to explain the CDF data.
Measuring of $|V_{ub}|$ in the forthcoming decade
C. S. Kim
Physics , 1997, DOI: 10.1016/S0920-5632(97)00433-7
Abstract: I first introduce the importance of measuring V_ub precisely. Then, from a theoretician's point of view, I review (a) past history, (b) present trials, and (c) possible future alternatives on measuring |V_ub| and/or |V_ub/V_cb|. As of my main topic, I introduce a model-independent method, which predicts \Gamma(B -> X_u l \nu) / \Gamma(B -> X_c l \nu) \equiv (\gamma_u / \gamma_c) \times | V_{ub} / V_{cb}|^2 \simeq (1.83 \pm 0.28) \times |V_ub / V_cb|^2 and |V_ub/V_cb| \equiv (\gamma_c / \gamma_u)^{1/2} \times [{\cal{B}}(B -> X_u l \nu)/{\cal{B}}(B -> X_c l \nu)]^{1/2} \simeq (0.74 \pm 0.06) \times [{\cal{B}}(B -> X_u l \nu)/ {\cal{B}}(B -> X_c l \nu)]^{1/2}, based on the heavy quark effective theory. I also explore the possible experimental options to separate B -> X_u l \nu from the dominant B -> X_c l \nu: the measurement of inclusive hadronic invariant mass distributions, and the `D - \pi' (and `K - \pi') separation conditions. I also clarify the relevant experimental backgrounds.
Associate $J/ψ+ γ$ Production: A Clean Probe of Unpolarized and Polarized Gluon Densities
C. S. Kim
Physics , 1996,
Abstract: Color-octet contributions to the associate $J/\psi+\gamma$ production are found to be negligible, compared to the ordinary color-singlet contribution. Within the color-singlet model the $J/\psi+\gamma$ production in the leading order is possible only through gluon-gluon fusion process. Therefore, the associate $J/\psi+\gamma$ production remains to be useful as a clean channel to probe the unpolarized and polarized gluon distribution inside proton (and photon), and to study heavy quarkonia production mechanism. We discuss in detail the associate production of $J/\psi+\gamma$ at $p \overline{p}$ (or $pp$) and $ep$ colliders. By requiring the $J/\psi$ to decay into an $e^+e^-$ or $\mu^+ \mu^-$ pair, we end up with an exceptionally clean final state. This process can therefore serve as a very clean probe of the gluon densities inside the proton as well as the photon. Numerical results are presented for the TEVATRON $p \overline{p}$ and HERA $ep$ colliders. This same mechanism can be used to probe the polarized gluon content of the proton in polarized $p + p (\bar p)$ collisions. We study in detail $J/\psi + \gamma$ production at both polarized fixed target and polarized collider energies for RHIC.
Electroweak Discussion Section Summary
C. S. Kim
Physics , 1993,
Abstract: I summarize our work of electroweak discussion section held at the 14th International Workshop on Weak Interactions and Neutrinos. We discussed about a few physics topics related to electroweak interactions, including $B$ and $K$ physics and weak flavor physics.
A Model-independent Way to Measure $|V_{ub}/V_{cb}|$
C. S. Kim
Physics , 1996,
Abstract: We propose a new model-independent method, to determine the ratio $|V_{ub}/V_{cb}|$, which is theoretically described by the phase space factor and the well-known perturbative QCD correction only. We explore the possible experimental options: the measurement of inclusive hadronic invariant mass distributions. We also discuss the relevant experimental backgrounds.
A New Model-independent Method of Determining |V_{ub}/V_{cb}|
C. S. Kim
Physics , 1996, DOI: 10.1016/S0370-2693(97)01203-3
Abstract: In order to determine the ratio of CKM matrix elements |V_{ub}/V_{cb}| (and |V_{ub}|), we propose a new model-independent method based on the heavy quark effective theory, which is theoretically described by the phase space factor and the well-known perturbative QCD correction only. In the forthcoming asymmetric B-experiments with microvertex detectors, BABAR and BELLE, the total separation of b --> u semileptonic decays from the dominant b --> c semileptonic decays would be experimentally viable. We explore the possible experimental option: the measurement of inclusive hadronic invariant mass distributions. We also clarify the relevant experimental backgrounds.
Using B_d^0, B_s^0 Decays at Hadronic B-Factories to Determine CP Angles alpha and beta
C. S. Kim
Physics , 1998,
Abstract: At the first PPPP workshop, I gave a review talk on physics of B and CP-phases. In my talk, I explained DRG method and our extension to extract CP angles $\alpha$ and $\gamma$ from measurements of the decay rates of $B_{d,s}^0 \to \pi\pi, \pi K, K K$. There are several advantages to this extension: discrete ambiguities are removed, fewer assumptions are necessary, and the method works even if all strong phases vanish. I also talked on several other topics.
New Physics Working Group Summary of LCWS2000 at FNAL
C. S. Kim
Physics , 2001, DOI: 10.1063/1.1394385
Abstract: Here I summarize P5-WG (New/Alternative Physics Working Group) of LCWS2000@FNAL, held on Oct 24-28, 2000. There were 13 talks altogether, 7 talks on collider signals from new particles/interactions and 6 talks on extra dimensional physics. We had very active and hot discussions among participants for those new/alternative physics/ideas.
Virtual SUSY Threshold Effects and CDF large $E_{T}$ Anomaly
C. S. Kim,S. Alam
Physics , 1996, DOI: 10.1016/S0370-2693(97)00201-3
Abstract: Recent CDF data of the inclusive jet cross section shows threshold-like structured deviation, around transverse momentum $E_T(j)\approx 200 \sim 350$ GeV. If this data is real, not just some statistical fluctuation, is it possible to interpret the anomaly in terms of virtual SUSY effects? The purpose of this note is to address this question. However, we find that virtual SUSY loop interference effects [near the threshold] are too small to explain the CDF data. Our main conclusion seems to be on the right track if we assume that the recent global analysis of improved parton distributions by Lai et al. is correct. PACS number(s): 14.65.Ha, 12.38.Bx, 12.60.Jv, 13.85.-t
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