Author
R. Kutschke
Bio: R. Kutschke is an academic researcher from Fermilab. The author has contributed to research in topics: Branching fraction & Meson. The author has an hindex of 20, co-authored 60 publications receiving 1218 citations.
Papers
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University of California, Davis1, CINVESTAV2, University of Colorado Boulder3, Fermilab4, Universidad de Guanajuato5, University of Illinois at Urbana–Champaign6, Indiana University7, Korea University8, Kyungpook National University9, University of Milan10, University of North Carolina at Chapel Hill11, University of Puerto Rico at Mayagüez12, University of South Carolina13, University of Tennessee14, Vanderbilt University15
TL;DR: Using data from the FOCUS experiment, the D+π− and D0π+ invariant mass distributions are analyzed to find evidence for broad structures over background in both the neutral and charged final state.
110 citations
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University of California, Davis1, CINVESTAV2, University of Colorado Boulder3, Fermilab4, University of Illinois at Urbana–Champaign5, Indiana University6, Korea University7, Kyungpook National University8, University of Milan9, University of North Carolina at Chapel Hill10, University of Puerto Rico at Mayagüez11, University of South Carolina12, University of Tennessee13, Vanderbilt University14, University of Wisconsin-Madison15
TL;DR: In this article, a search for CPT violation in neutral charm meson oscillations was performed and the 95% confidence level limit is −0.0068 ξ ) y −(Im ξ) x N ( x, y, δ )(Δ a 0 + 0.6Δa Z ) −16 ǫ −16 Á −16 n −16 −16
80 citations
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University of California, Davis1, University of Pittsburgh2, Universidad Michoacana de San Nicolás de Hidalgo3, University of the Republic4, University of Los Andes5, Federal University of Bahia6, CINVESTAV7, University of Puerto Rico at Mayagüez8, Benemérita Universidad Autónoma de Puebla9, National Center for Atmospheric Research10, University of Colorado Boulder11, Fermilab12, Lawrence Berkeley National Laboratory13, University of Illinois at Urbana–Champaign14, Indiana University15, Korea University16, University of Milan17, University of North Carolina at Chapel Hill18, University of Brescia19, Nokia20, University of South Carolina21, University of Tennessee22, Vanderbilt University23, Adams State University24, University of Wisconsin-Madison25, Yonsei University26
TL;DR: In this paper, the lifetimes of neutral D mesons decaying via D 0 → K − π + and K − K + were compared to measure the lifetime differences between CP even and CP odd final states.
77 citations
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University of California, Davis1, CINVESTAV2, University of Colorado Boulder3, Fermilab4, Universidad de Guanajuato5, University of Illinois at Urbana–Champaign6, Indiana University7, Korea University8, Kyungpook National University9, University of Milan10, University of North Carolina at Chapel Hill11, University of Puerto Rico at Mayagüez12, University of South Carolina13, University of Tennessee14, Vanderbilt University15
TL;DR: In this paper, the K-matrix formalism is applied to the Dalitz plot analysis of D + s and D + to π + π − π+ for the first time, and the results are discussed along with their possible implications for the controversial σ meson.
64 citations
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University of California, Davis1, CINVESTAV2, University of Colorado Boulder3, Fermilab4, University of Illinois at Urbana–Champaign5, Indiana University6, Korea University7, Kyungpook National University8, University of Milan9, University of North Carolina at Chapel Hill10, University of Puerto Rico11, University of South Carolina12, University of Tennessee13, Vanderbilt University14, University of Wisconsin-Madison15
TL;DR: In this article, the authors present evidence for a small even spin K−π+ amplitude that interferes with the dominant K ∗0 component in the D+→K−π +μ+ν final state.
61 citations
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TL;DR: In this paper, the authors report world averages of measurements of b-hadron, c-, c-, and tau-lepton properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available through the end of 2011.
Abstract: This article reports world averages of measurements of b-hadron, c-hadron, and tau-lepton properties obtained by the Heavy Flavor Averaging Group (HFAG) using results available through the end of 2011. In some cases results available in the early part of 2012 are included. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, CP violation parameters, parameters of semileptonic decays and CKM matrix elements.
2,151 citations
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TL;DR: In this article, the role of the gravitational sector in the Lorentz and CPT-violating standard-model extension (SME) is studied, and the leading-order terms in the SME action involving operators of mass dimension three and four are constructed.
Abstract: The role of the gravitational sector in the Lorentz- and CPT-violating standard-model extension (SME) is studied. A framework is developed for addressing this topic in the context of Riemann-Cartan spacetimes, which include as limiting cases the usual Riemann and Minkowski geometries. The methodology is first illustrated in the context of the QED extension in a Riemann-Cartan background. The full SME in this background is then considered, and the leading-order terms in the SME action involving operators of mass dimension three and four are constructed. The incorporation of arbitrary Lorentz and CPT violation into general relativity and other theories of gravity based on Riemann-Cartan geometries is discussed. The dominant terms in the effective low-energy action for the gravitational sector are provided, thereby completing the formulation of the leading-order terms in the SME with gravity. Explicit Lorentz symmetry breaking is found to be incompatible with generic Riemann-Cartan geometries, but spontaneous Lorentz breaking evades this difficulty.
1,082 citations
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Kyoto University1, Nagoya University2, Brookhaven National Laboratory3, KEK4, Université Paris-Saclay5, University of Washington6, University of Connecticut7, University of Bern8, University of Southern Denmark9, Spanish National Research Council10, University of Rome Tor Vergata11, Forschungszentrum Jülich12, University of Wuppertal13, Osaka University14, San Francisco State University15, Indiana University16, Graduate University for Advanced Studies17, American Physical Society18, University of Edinburgh19, University of Southampton20, Aix-Marseille University21, National Chiao Tung University22, Roma Tre University23, Columbia University24, Autonomous University of Madrid25, University of Mainz26
TL;DR: The determination of the light-quark masses, the form factor, and the decay-constant ratio arising in semileptonic $$K \rightarrow \pi $$K→π transition at zero momentum transfer are reported on.
Abstract: We review lattice results related to pion, kaon, D- and B-meson physics with the aim of making them easily accessible to the particle physics community. More specifically, we report on the determination of the light-quark masses, the form factor f+(0), arising in semileptonic K -> pi transition at zero momentum transfer, as well as the decay constant ratio fK/fpi of decay constants and its consequences for the CKM matrix elements Vus and Vud. Furthermore, we describe the results obtained on the lattice for some of the low-energy constants of SU(2)LxSU(2)R and SU(3)LxSU(3)R Chiral Perturbation Theory and review the determination of the BK parameter of neutral kaon mixing. The inclusion of heavy-quark quantities significantly expands the FLAG scope with respect to the previous review. Therefore, for this review, we focus on D- and B-meson decay constants, form factors, and mixing parameters, since these are most relevant for the determination of CKM matrix elements and the global CKM unitarity-triangle fit. In addition we review the status of lattice determinations of the strong coupling constant alpha_s.
901 citations
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TL;DR: In this article, it was shown that the meson σ and κ mesons exhibit a spectrum of (squared) masses which are proportional to the sum of orbital angular momentum and radial quantum numbers.
716 citations
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TL;DR: Recently, a variety of QCD inspired phenomenological models have been proposed, such as meson-gluon hybrids and pentaquark baryons that contain heavy (charm or bottom) quarks as mentioned in this paper.
Abstract: Quantum chromodynamics (QCD), the generally accepted theory for strong interactions, describes the interactions between quarks and gluons. The strongly interacting particles that are seen in nature are hadrons, which are composites of quarks and gluons. Since QCD is a strongly coupled theory at distance scales that are characteristic of observable hadrons, there are no rigorous, first-principle methods to derive the spectrum and properties of the hadrons from the QCD Lagrangian, except for lattice QCD simulations that are not yet able to cope with all aspects of complex and short-lived states. Instead, a variety of “QCD inspired” phenomenological models have been proposed. Common features of these models are predictions for the existence of hadrons with substructures that are more complex than the standard quark-antiquark mesons and the three-quark baryons of the original quark model that provides a concise description of most of the low-mass hadrons. Recently, an assortment of candidates for nonstandard multiquark mesons, meson-gluon hybrids, and pentaquark baryons that contain heavy (charm or bottom) quarks has been discovered. Here the experimental evidence for these states is reviewed and some general comparisons of their measured properties with standard quark model expectations and predictions of various models for nonstandard hadrons are made. The conclusion is that the spectroscopy of all but the simplest hadrons is not yet understood.
682 citations