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Статті в журналах з теми "Isospin-Violating"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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1

Feng, Jonathan L., Jason Kumar, Danny Marfatia, and David Sanford. "Isospin-violating dark matter." Physics Letters B 703, no. 2 (September 2011): 124–27. http://dx.doi.org/10.1016/j.physletb.2011.07.083.

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2

KUMAR, JASON. "PROBING ISOSPIN-VIOLATING DARK MATTER." International Journal of Modern Physics: Conference Series 10 (January 2012): 115–22. http://dx.doi.org/10.1142/s201019451200582x.

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Анотація:

We discuss experimental probes of isospin-violating dark matter (IVDM), including direct and indirect detection strategies. We point out the important role which IVDM plays in understanding recent data regarding low-mass dark matter, and describe strategies for finding evidence of IVDM at current and upcoming experiments.

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3

Fajfer, S., K. Suruliz та Robert J. Oakes. "Isospin-violating radiative decays of theηmeson". Physical Review D 44, № 1 (1 липня 1991): 295–98. http://dx.doi.org/10.1103/physrevd.44.295.

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4

Gang, LI, ZHANG Yuan-Jiang, ZHAO Qiang, and ZOU Bing-Song. "Isospin violating mechanisms in quarkonium hadronic decays." Chinese Physics C 34, no. 6 (June 2010): 842–47. http://dx.doi.org/10.1088/1674-1137/34/6/037.

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5

Gao, Yu, Jason Kumar, and Danny Marfatia. "Isospin-violating dark matter in the Sun." Physics Letters B 704, no. 5 (October 2011): 534–40. http://dx.doi.org/10.1016/j.physletb.2011.09.078.

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6

Lipkin, Harry J., and S. F. Tuan. "Isospin violating pion emission from heavy quarkonium." Physics Letters B 368, no. 1-2 (January 1996): 148–52. http://dx.doi.org/10.1016/0370-2693(95)01465-9.

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7

Donnelly, T. W., J. Dubach, and Ingo Sick. "Isospin dependences in parity-violating electron scattering." Nuclear Physics A 503, no. 3-4 (October 1989): 589–631. http://dx.doi.org/10.1016/0375-9474(89)90432-6.

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8

Sather, Eric. "Isospin-violating quark distributions in the nucleon." Physics Letters B 274, no. 3-4 (January 1992): 433–38. http://dx.doi.org/10.1016/0370-2693(92)92011-5.

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9

Del Nobile, Eugenio. "Halo-Independent Comparison of Direct Dark Matter Detection Data." Advances in High Energy Physics 2014 (2014): 1–13. http://dx.doi.org/10.1155/2014/604914.

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Анотація:

We review the halo-independent formalism that allows comparing data from different direct dark matter detection experiments without making assumptions on the properties of the dark matter halo. We apply this method to spin-independent WIMP-nuclei interactions, for both isospin-conserving and isospin-violating couplings, and to WIMPs interacting through an anomalous magnetic moment.

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10

Gronberg, J., C. M. Korte, R. Kutschke, S. Menary, R. J. Morrison, S. Nakanishi, H. N. Nelson та ін. "Observation of the Isospin-Violating DecayDs*+→Ds+π0". Physical Review Letters 75, № 18 (30 жовтня 1995): 3232–36. http://dx.doi.org/10.1103/physrevlett.75.3232.

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11

Bélanger, Geneviève, Andreas Goudelis, Jong-Chul Park, and Alexander Pukhov. "Isospin-violating dark matter from a double portal." Journal of Cosmology and Astroparticle Physics 2014, no. 02 (February 13, 2014): 020. http://dx.doi.org/10.1088/1475-7516/2014/02/020.

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12

Khalil, Ali E. "Time violating amplitudes in the (3He, p) reactions." Canadian Journal of Physics 66, no. 7 (July 1, 1988): 612–17. http://dx.doi.org/10.1139/p88-101.

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Анотація:

The difference between the polarization (P) of protons in the reaction (3He, [Formula: see text]) and the analyzing power (A) in the inverse reaction ([Formula: see text], 3He) has been calculated using a spin-independent isospin-independent, time reversal violating interaction in the form [α(r)[Formula: see text] + Hermitian conjugate]. The interaction strength is adjusted to be 1% of the time conserving optical potentials. A distorted-wave Born approximation (DWBA) calculation assuming a direct reaction mechanism has been performed. The relative values of the time violating amplitudes have no signatures for any measurable time violating effects.

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13

Nagao, K. I., and T. Naka. "Isospin-violating dark matter search by nuclear emulsion detector." Progress of Theoretical and Experimental Physics 2013, no. 4 (April 1, 2013): 43B02–0. http://dx.doi.org/10.1093/ptep/pts098.

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14

Li, Gang, Yuan-Jiang Zhang та Qiang Zhao. "Study of isospin violating φ excitation ine+e−→ ωπ0". Journal of Physics G: Nuclear and Particle Physics 36, № 8 (14 липня 2009): 085008. http://dx.doi.org/10.1088/0954-3899/36/8/085008.

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15

Chen, Nan, Qing Wang, Wei Zhao, Shin-Ted Lin, Qian Yue, and Jin Li. "Exothermic isospin-violating dark matter after SuperCDMS and CDEX." Physics Letters B 743 (April 2015): 205–12. http://dx.doi.org/10.1016/j.physletb.2015.02.043.

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16

Zhou, Yu-Feng. "Direct and Indirect Constraints on Isospin-Violating Dark Matter." Nuclear Physics B - Proceedings Supplements 246-247 (January 2014): 99–105. http://dx.doi.org/10.1016/j.nuclphysbps.2013.10.072.

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17

Törnqvist, Nils A., and Piotr Żenczykowski. "Isospin violating mass differences of baryons and hadronic loops." Zeitschrift für Physik C Particles and Fields 31, no. 3 (September 1986): 439–42. http://dx.doi.org/10.1007/bf01588042.

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18

Moreno, O., P. Sarriguren, E. Moya de Guerra, J. M. Udias, T. W. Donnelly, and I. Sick. "Nuclear isospin mixing and elastic parity-violating electron scattering." Nuclear Physics A 828, no. 3-4 (September 2009): 306–32. http://dx.doi.org/10.1016/j.nuclphysa.2009.07.011.

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19

HANHART, CHRISTOPH. "ISOSPIN BREAKING IN HADRONIC REACTIONS." International Journal of Modern Physics A 20, no. 02n03 (January 30, 2005): 543–45. http://dx.doi.org/10.1142/s0217751x05021737.

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Анотація:

In the standard model the isospin symmetry is broken by electro magnetic interactions as well as the difference in the quark masses. Given a systematic scheme that allows to disentangle these two effects it is possible to get direct access to properties of QCD from low and medium energy hadronic reactions. Recently interest in isospin breaking reactions has revived due to the measurement of a forward–backward asymmetry in pn→dπ0 as well as the total cross section for dd→απ0—both quantities vanish in an isospin symmetric world. The current status of the theoretical analysis for these reactions is disucssed. In addition, I will briefly discuss how the isospin violating a0(980)-f0(980) transition amplitude can be studied in dd and pn induced production reactions—a quantity that is believed to reveal important information on the nature of these lightest scalar mesons.

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20

Yuan, Chang-Zheng, Xiao-Hu Mo та Ping Wang. "Branching fraction of the isospin violating process φ → ωπ 0". Chinese Physics C 35, № 6 (червень 2011): 543–44. http://dx.doi.org/10.1088/1674-1137/35/6/006.

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21

Cirigliano, Vincenzo, Michael L. Graesser, Grigory Ovanesyan, and Ian M. Shoemaker. "Shining LUX on isospin-violating dark matter beyond leading order." Physics Letters B 739 (December 2014): 293–301. http://dx.doi.org/10.1016/j.physletb.2014.10.058.

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22

Zheng, Hao, Kai-Jia Sun, and Lie-Wen Chen. "OLD NEUTRON STARS AS PROBES OF ISOSPIN-VIOLATING DARK MATTER." Astrophysical Journal 800, no. 2 (February 20, 2015): 141. http://dx.doi.org/10.1088/0004-637x/800/2/141.

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23

SASSEN, F. P., and S. KREWALD. "AN INVESTIGATION OF THE $D_s^+\pi^0-DK-D_s^+\eta$ COUPLED CHANNEL DYNAMICS." International Journal of Modern Physics A 20, no. 02n03 (January 30, 2005): 705–7. http://dx.doi.org/10.1142/s0217751x05022226.

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Анотація:

We investigate the dynamics of the coupled channel system consisting of the [Formula: see text]-, DK-, and [Formula: see text]-channels. We find that in the isoscalar channel a DK-molecule is formed due to the attraction of the t-channel meson exchange potentials. This may explain the observations by BaBar, Cleo, Belle and others of a narrow DsJ state at 2317 MeV. We thoroughly investigate the influence of isospin breaking via mass differences, ρω- and πη-mixing on this molecule since within our model only isospin violating processes contribute to the width of the molecule. If the DsJ(2317) is assumed to be a pure molecule we predict a width much smaller than the current experimental upper limit.

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24

Gevorkyan, S. R. "Isospin Symmetry Violating Effects and Scattering Length Extraction from Kaon Decays." Ядерная физика 76, no. 08 (2013): 1061–66. http://dx.doi.org/10.7868/s0044002713080102.

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25

Peiró, Miguel. "Isospin violating dark matter in Stückelberg portals with intersecting D-branes." Journal of Physics: Conference Series 718 (May 2016): 042042. http://dx.doi.org/10.1088/1742-6596/718/4/042042.

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26

Ramavataram, S., E. Hadjimichael, and T. W. Donnelly. "Parity-violating asymmetry in elastice→−4He scattering: Effects of isospin admixtures." Physical Review C 50, no. 2 (August 1, 1994): 1175–79. http://dx.doi.org/10.1103/physrevc.50.1175.

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27

Gevorkyan, S. R. "Isospin symmetry violating effects and scattering length extraction from kaon decays." Physics of Atomic Nuclei 76, no. 8 (August 2013): 1004–9. http://dx.doi.org/10.1134/s1063778813080103.

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28

Gonzàlez-Solís, Sergi. "Estimates on the isospin-violating τ − → π − η (′) ν τ decays". Nuclear and Particle Physics Proceedings 287-288 (червень 2017): 3–6. http://dx.doi.org/10.1016/j.nuclphysbps.2017.03.032.

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29

Lutz, Matthias F. M., and Madeleine Soyeur. "Radiative and isospin-violating decays of -mesons in the hadrogenesis conjecture." Nuclear Physics A 813, no. 1-2 (November 2008): 14–95. http://dx.doi.org/10.1016/j.nuclphysa.2008.09.003.

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30

Gardner, S., C. J. Horowitz, and J. Piekarewicz. "Charge-Symmetry-Breaking Potentials from Isospin-Violating Meson-Baryon Coupling Constants." Physical Review Letters 75, no. 13 (September 25, 1995): 2462–65. http://dx.doi.org/10.1103/physrevlett.75.2462.

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31

LÜ, GANG, ZHEN-HUA ZHANG, XIU-YING LIU та LI-YING ZHANG. "NEW RESULT OF DIRECT CP VIOLATION IN B → π+π-π+π-". International Journal of Modern Physics A 26, № 17 (10 липня 2011): 2899–912. http://dx.doi.org/10.1142/s0217751x11053626.

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Анотація:

In the framework of factorization, based on the first-order of isospin violation, we study direct CP violation in the decay of [Formula: see text] including the effect of ρ–ω mixing. The CP violation depends strongly on Cabibbo–Kobayashi–Maskawa (CKM) matrix elements and the effective parameter, Nc. Recently, the experimental data for the branching ratios of [Formula: see text] are accurate and we can give the strong constraint on the range of Nc. We find that the CP violating asymmetry is large and ranges from -82% to -98% via ρ–ω mixing mechanism when the invariant mass of the π+π- pair is in the vicinity of the ω resonance. We also discuss the possibility to observe the predicted CP violating asymmetries at the LHC.

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32

Drozd, Aleksandra, Bohdan Grzadkowski, John F. Gunion, and Yun Jiang. "Isospin-violating dark-matter-nucleon scattering via two-Higgs-doublet-model portals." Journal of Cosmology and Astroparticle Physics 2016, no. 10 (October 24, 2016): 040. http://dx.doi.org/10.1088/1475-7516/2016/10/040.

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33

Zheng, Hao, Zhen Zhang, and Lie-Wen Chen. "Form factor effects in the direct detection of isospin-violating dark matter." Journal of Cosmology and Astroparticle Physics 2014, no. 08 (August 5, 2014): 011. http://dx.doi.org/10.1088/1475-7516/2014/08/011.

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34

DEL NOBILE, EUGENIO, CHRIS KOUVARIS, FRANCESCO SANNINO, and JUSSI VIRKAJÄRVI. "DARK MATTER INTERFERENCE." Modern Physics Letters A 27, no. 19 (June 21, 2012): 1250108. http://dx.doi.org/10.1142/s0217732312501088.

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Анотація:

We study different patterns of interference in WIMP-nuclei elastic scattering that can accommodate the DAMA and CoGeNT experiments via an isospin violating ratio fn/fp = -0.71. We study interference between the following pairs of mediators: Z and Z′, Z′ and Higgs, and two Higgs fields. We show under what conditions interference works. We also demonstrate that in the case of the two Higgs interference, an explanation of the DAMA/CoGeNT is consistent with electroweak baryogenesis scenarios based on two Higgs doublet models proposed in the past.

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35

Gardner, S., C. J. Horowitz, and J. Piekarewicz. "Isospin-violating meson-nucleon vertices as an alternate mechanism of charge-symmetry breaking." Physical Review C 53, no. 3 (March 1, 1996): 1143–53. http://dx.doi.org/10.1103/physrevc.53.1143.

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36

Capstick, Simon, and B. D. Keister. "Comment on “Charge-Symmetry-Breaking Potentials from Isospin-Violating Meson-Baryon Coupling Constants”." Physical Review Letters 78, no. 9 (March 3, 1997): 1825. http://dx.doi.org/10.1103/physrevlett.78.1825.

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37

NEUBERT, MATTHIAS. "ENHANCED GLUINO BOX CONTRIBUTION TO ∊′/∊ IN SUSY." International Journal of Modern Physics A 16, supp01b (September 2001): 675–79. http://dx.doi.org/10.1142/s0217751x01007777.

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Анотація:

We show that in supersymmetric extensions of the Standard Model gluino box diagrams can yield a large CP-violating [Formula: see text] contribution to [Formula: see text] flavor-chaging neutral current processes, which feeds into the I=2 isospin amplitude in K→ππ decays. This contribution only requires moderate mass splitting between the right-handed squarks ũR and [Formula: see text], and persists for squark masses of order 1 TeV. Taking into account current bounds on Im [Formula: see text] from [Formula: see text] mixing, the resulting contribution to ∊′/∊ could naturally be an order of magnitude larger than the measured value.

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38

NAM, SOO-HYEON. "QED CORRECTIONS TO ISOSPIN-RELATED DECAY RATES OF CHARGED AND NEUTRAL B MESONS." Modern Physics Letters A 20, no. 02 (January 20, 2005): 95–101. http://dx.doi.org/10.1142/s0217732305016361.

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We estimate the isospin-violating QED radiative corrections to the charged-to-neutral ratios of the decay rates for B+ and B0 in non-leptonic B meson decays. In particular, these corrections are potentially important for precision measurement of the charged-to-neutral production ratio of B meson in e+e- annihilation. We calculate explicitly the QED corrections to the ratios of two different types of decay rates Γ(B+→J/ψK+)/Γ(B0→J/ψK0) and [Formula: see text] taking into account the form factors of the mesons based on the vector meson dominance model, and compare them with the results obtained for the point-like mesons.

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39

Nomura, Takaaki, and Hiroshi Okada. "A model with isospin doublet U(1)D gauge symmetry." International Journal of Modern Physics A 33, no. 14n15 (May 28, 2018): 1850089. http://dx.doi.org/10.1142/s0217751x18500896.

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Анотація:

We propose a model with an extra isospin doublet [Formula: see text] gauge symmetry, in which we introduce several extra fermions with odd parity under a discrete [Formula: see text] symmetry in order to cancel the gauge anomalies out. A remarkable issue is that we impose nonzero [Formula: see text] charge to the Standard Model Higgs, and it gives the most stringent constraint to the vacuum expectation value of a scalar field breaking the [Formula: see text] symmetry that is severer than the LEP bound. We then explore relic density of a Majorana dark matter candidate without conflict of constraints from lepton flavor violating processes. A global analysis is carried out to search for parameters which can accommodate with the observed data.

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40

ADLARSON, PATRIK, та MARCIN ZIELIŃSKI. "MEASUREMENT OF THE η → π+π-π0 DECAY WITH WASA-at-COSY DETECTOR". International Journal of Modern Physics A 26, № 03n04 (10 лютого 2011): 622–24. http://dx.doi.org/10.1142/s0217751x11052232.

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Анотація:

One of the objectives of the physics programme of the WASA-at-COSY facility is to study the isospin violating η hadronic decays into π+π-π0 systems driven by the term of QCD Lagrangian which depends on the d and u quark mass difference. These studies can be made in terms of the Dalitz plot parameters describing the density population which is proportional to the square of the amplitude |A(x, y)|2. This contribution describes the current status of the analysis of the η → π+π-π0 decay in the pd →3 Heη and as well in the pp → ppη reaction with WASA-at-COSY.

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41

Aslanzadeh, M., and A. A. Rajabi. "A simple semi-relativistic hypercentral constituent quark model for light baryons." Canadian Journal of Physics 94, no. 2 (February 2016): 236–42. http://dx.doi.org/10.1139/cjp-2015-0360.

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Анотація:

In this work, baryons as a three-body bound system have been investigated in a semi-relativistic approach. Our model, like all constituent quark models, contains a dominant SU(6)-invariant part accounting for the average multiplet energies, and a perturbative SU(6)-violating interaction for the splitting within the multiplets, a structure that is inspired by lattice QCD calculations. Introducing a spin-independent relativistic description for the SU(6)-invariant part of the spectrum, we presented the exact analytical solution of the three-particle Klein–Gordon equation, through which the average energy values of the nonstrange resonances are reproduced. To describe the hyperfine structure of the baryon, the splittings within the SU(6) multiplets are produced by the spin- and isospin-dependent SU(6)-violating interaction, which have been treated as perturbative terms. For the SU(6)-invariant potential, we have added a quadratic term to the popular “Coulombic-plus-linear” potential. The resulting description of the baryon spectrum is comparable with those obtained by other calculations and experimental spectrum.

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42

Filip, Peter. "Internal structure modification and decay of hadrons in strong magnetic field." International Journal of Modern Physics: Conference Series 39 (January 2015): 1560114. http://dx.doi.org/10.1142/s2010194515601143.

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Анотація:

We discuss the influence of external magnetic field on strong decays of [Formula: see text], [Formula: see text] and [Formula: see text] mesons. Due to increasing energy of [Formula: see text] Landau level of charged decay products, particular decay channels may become suppressed and isospin rules for strong decays can be violated. In the case of [Formula: see text] meson, enhanced production of photons and dileptons (with modified invariant mass) may occur. Similar considerations are applied to decays of [Formula: see text] baryon. We also suggest that static electromagnetic field of sufficient strength can modify the internal structure (wavefunction) of [Formula: see text] J/[Formula: see text] and [Formula: see text] mesons, and specific decay channels (e.g. CP — violating [Formula: see text]) can become enhanced.

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43

MIRANSKY, V. A., MASAHARU TANABASHI, and KOICHI YAMAWAKI. "IS THE t QUARK RESPONSIBLE FOR THE MASS OF W AND Z BOSONS?" Modern Physics Letters A 04, no. 11 (June 10, 1989): 1043–53. http://dx.doi.org/10.1142/s0217732389001210.

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Анотація:

Based on the dynamical model having a large anomalous dimension γm≃2, we propose that the t quark condensate is responsible for the mass of W and Z bosons within the framework of the SU (3)C×SU(2)L×U(1)Y gauge theory (without Higgs) plus four-fermion interactions among quarks and leptons. This accounts for the largeness of the t quark mass mt without violating the weak-isospin relation [Formula: see text]. Quark/lepton mass matrices are obtained through the four-fermion interactions, which yields no serious flavor-changing neutral currents. The model predicts a [Formula: see text] composite scalar meson with a mass ≃2mt. A possibility for an unusual resolution of the strong CP problem is also suggested.

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44

Ormand, W. E. "Effects of Isospin-Symmetry Violation on Tests of the Standard Model Using Parity-Violating Electron Scattering." Physical Review Letters 82, no. 6 (February 8, 1999): 1101–4. http://dx.doi.org/10.1103/physrevlett.82.1101.

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45

SOYEUR, MADELEINE, and MATTHIAS F. M. LUTZ. "RADIATIVE AND STRONG DECAYS OF Ds-MESONS IN THE HADROGENESIS CONJECTURE." Modern Physics Letters A 23, no. 27n30 (September 30, 2008): 2242–45. http://dx.doi.org/10.1142/s0217732308029113.

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Анотація:

The recently discovered scalar [Formula: see text] and axial vector [Formula: see text] charmed strange mesons are predicted in the hadrogenesis picture. They are generated by coupled-channel dynamics involving the scattering of Nambu-Goldstone bosons off pseudoscalar and vector D(Ds)-meson ground-states. The interaction vertices are given by the leading order chiral Lagrangian and chiral corrections to order [Formula: see text]. To assess this dynamical picture further, the radiative and strong decays into the isospin-violating π0Ds and [Formula: see text] channels are calculated. A consistent picture of these decays emerges when the parameters are chosen in accordance with expectations from the heavy-quark symmetry and large N c limit of QCD and when light vector mesons are introduced explicitly in the radiative decay processes. More accurate data are needed to predict decay parameters reliably.

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46

Ghozzi, Stephane, та Fred Jegerlehner. "Isospin violating effects in e+e− vs. τ measurements of the pion form factor |Fπ|2(s)". Physics Letters B 583, № 3-4 (березень 2004): 222–30. http://dx.doi.org/10.1016/j.physletb.2004.01.021.

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47

Li, Sheng-Tao, та Gang Lü. "Hunting for Direct CP Violation in B ¯ s 0 ⟶ π + π − K ∗ 0". Advances in High Energy Physics 2022 (23 лютого 2022): 1–18. http://dx.doi.org/10.1155/2022/3136459.

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In perturbative QCD approach, based on the first order of isospin symmetry breaking, we study the direct CP violation in the decay of B ¯ s 0 ⟶ ρ ω K ∗ 0 ⟶ π + π − K ∗ 0 . An interesting mechanism is applied to enlarge the C P violating asymmetry involving the charge symmetry breaking between ρ and ω . We find that the CP violation is large by the ρ − ω mixing mechanism when the invariant masses of the π + π − pairs are in the vicinity of the ω resonance. For the decay process of B ¯ s 0 ⟶ ρ ω K ∗ 0 ⟶ π + π − K ∗ 0 , the maximum CP violation can reach − 59.12 % . Furthermore, taking ρ − ω mixing into account, we calculate the branching ratio for B ¯ s 0 ⟶ ρ ω K ∗ 0 . We also discuss the possibility of observing the predicted C P violation asymmetry at the LHC.

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48

Lin, Guey-Lin, and Yen-Hsun Lin. "Analysis on the black hole formations inside old neutron stars by isospin-violating dark matter with self-interaction." Journal of Cosmology and Astroparticle Physics 2020, no. 08 (August 11, 2020): 022. http://dx.doi.org/10.1088/1475-7516/2020/08/022.

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49

Lampe, Bodo. "A microscopic approach to quark and lepton masses and mixings." International Journal of Modern Physics A 30, no. 04n05 (February 11, 2015): 1550025. http://dx.doi.org/10.1142/s0217751x15500256.

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In recent papers, a microscopic model for the SM Higgs mechanism has been proposed, and an idea how to determine the 24 quark and lepton masses of all three generations has emerged in that framework. This idea is worked out in detail here by accommodating the fermion masses and mixings to microscopic parameters. The top quark mass can be given in terms of the Fermi scale and of certain exchange couplings of isospin vectors obeying a tetrahedral symmetry. The observed hierarchy in the family spectrum is attributed to a natural hierarchy in the microscopic couplings. The neutrinos will be shown to vibrate within the potential valleys of the system, thus retaining very tiny masses. This is related to a Goldstone effect inside the internal dynamics. A discussion of the quark and lepton mixing matrices is also included. The mixing angles of the PMNS matrix are calculated for an example set of parameters, and a value for the CP-violating phase is given.

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50

SOYEUR, MADELEINE, and MATTHIAS F. M. LUTZ. "DYNAMICS OF STRONG AND RADIATIVE DECAYS OF Ds MESONS." International Journal of Modern Physics A 24, no. 02n03 (January 30, 2009): 417–21. http://dx.doi.org/10.1142/s0217751x09043754.

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The positive parity scalar [Formula: see text] and axial-vector [Formula: see text] charmed strange mesons are generated by coupled-channel dynamics through the s-wave scattering of Goldstone bosons off the pseudoscalar and vector D ( D s)-meson ground states. The attraction leading to the specific masses of these states reflects the chiral symmetry breaking scale which characterizes the Weinberg-Tomozawa interaction in the chiral Lagrangian. Chiral corrections to order [Formula: see text] are calculated and found to be small. The [Formula: see text] and [Formula: see text] mesons decay either strongly into the isospin-violating π0 D s and [Formula: see text] channels or electromagnetically. We show that the π0-η and ( K 0 D +- K + D 0) mixings act constructively to generate strong widths of the order of 140 keV. The one-loop contribution to the radiative decay amplitudes of scalar and axial-vector states is calculated using the electromagnetic Lagrangian to chiral order [Formula: see text]. We show the importance of taking into account processes involving light vector mesons explicitly in the dynamics of electromagnetic decays to obtain a satisfactory description of the available data.

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