Effects to Scalar Meson Decays of Strong Mixing between Low and High Mass Scalar Mesons

2004 ◽  
Author(s):  
Tadayuki Teshima
Keyword(s):  
Scalar Meson ◽  
High Mass ◽  
Strong Mixing ◽  
Meson Decays ◽  
Scalar Mesons

scholarly journals Four-Quark States from Functional Methods

2020 ◽  
Vol 61 (4) ◽  
Author(s):  
Gernot Eichmann ◽  
Christian S. Fischer ◽  
Walter Heupel ◽  
Nico Santowsky ◽  
Paul C. Wallbott
Keyword(s):  
Symmetry Breaking ◽  
Scalar Meson ◽  
Chiral Symmetry Breaking ◽  
The Other ◽  
Feature Article ◽  
Exotic Mesons ◽  
Scalar Mesons ◽  
Functional Methods ◽  
Internal Structures ◽  
Light Scalar

AbstractIn this feature article we summarise and highlight aspects of the treatment of four-quark states with functional methods. Model approaches to those exotic mesons almost inevitably have to assume certain internal structures, e.g. by grouping quarks and antiquarks into (anti-)diquark clusters or heavy-light $$q{\bar{q}}$$ q q ¯ pairs. Functional methods using Dyson–Schwinger and Bethe–Salpeter equations can be formulated without such prejudice and therefore have the potential to put these assumptions to test and discriminate between such models. So far, functional methods have been used to study the light scalar-meson sector and the heavy-light sector with a pair of charmed and a pair of light quarks in different quantum number channels. For all these states, the dominant components in terms of internal two-body clustering have been identified. It turns out that chiral symmetry breaking plays an important role for the dominant clusters in the light meson sector (in particular for the scalar mesons) and that this property is carried over to the heavy-light sector. Diquark-antidiquark components, on the other hand, turn out to be almost negligible for most states with the exception of open-charm heavy-light exotics.

scholarly journals Light meson decays at BESIII

2019 ◽  
Vol 199 ◽  
pp. 01023
Author(s):  
Wencheng Yan
Keyword(s):  
Perturbation Theory ◽  
Symmetry Breaking ◽  
Chiral Perturbation Theory ◽  
Radiative Decay ◽  
Light Meson ◽  
Chiral Perturbation ◽  
Meson Decays ◽  
Scalar Mesons

The BESIII experiment has accumulated the world’s largest data samples of 1.3 billion J/ψ events and 0.45 billion ψ(3686) events, which provide a unique opportunity to investigate light meson decays. The η and η′ decays are sensitive tools for investigations of π − π and η − π interactions, symmetry breaking, and serve as a test of chiral perturbation theory. In recent years considerable results on η and η′ decays were achieved at the BESIII experiment. In this proceeding, we present the significant progresses on amplitude analyses of Dalitz decays η' → 3π,η' → ηππ, and radiative decay η' → γπ+π−, η' → γγπ0. Additionally, the $a_0^0\left( {980} \right) - {f_0}\left( {980} \right)$ mixing is an important probe to the nature of those two lightest scalar mesons. The first observation of $a_0^0\left( {980} \right) - {f_0}\left( {980} \right)$ mixing is also presented, which will help to improve the understanding of the nature of $a_0^0\left( {980} \right)$ and f0(980).

scholarly journals Inverse mass hierarchy of light scalar mesons driven by anomaly-induced flavor breaking

2020 ◽  
Vol 2020 (5) ◽  
Author(s):  
Yoshiki Kuroda ◽  
Masayasu Harada ◽  
Shinya Matsuzaki ◽  
Daisuke Jido
Keyword(s):  
Symmetry Breaking ◽  
Chiral Symmetry ◽  
Scalar Meson ◽  
Chiral Symmetry Breaking ◽  
Linear Sigma Model ◽  
Mass Hierarchy ◽  
Scalar Mesons ◽  
Light Scalar ◽  
Symmetry Breaking Term ◽  
Breaking Term

Abstract We propose a novel mechanism to reproduce the observed mass hierarchy for scalar mesons lighter than 1 GeV (called the inverse hierarchy), regarding them as mesons made of a quark and an anti-quark ($q\bar{q}$ mesons). The source is provided by the SU(3) flavor-symmetry breaking induced by the U(1) axial anomaly. In particular, the anomaly term including the explicit chiral symmetry breaking plays a significant role in the light scalar meson spectrum. To be concrete, we construct a linear sigma model for scalar mesons of $q\bar{q}$ type together with their pseudoscalar chiral partners, including an anomaly-induced explicit chiral symmetry-breaking term. We find that, due to the proposed mechanism, the inverse hierarchy, i.e., $m\left[ a_0 (980) \right] \simeq m\left[ f_0 (980) \right] > m \left[ K_0^\ast (700) \right] > m \left[ f_0(500) \right]$, is indeed realized. Consequently, the quark content of $f_0 (500)$ is dominated by the isoscalar $\bar uu+ \bar dd$ component, and $f_0 (980)$ by the strange quark bilinear one, $s\bar{s}$.

Impact of scalar mesons on the rare B-decays

2015 ◽  
Vol 39 ◽  
pp. 1560086
Author(s):  
Aidos Issadykov ◽  
Mikhail A. Ivanov ◽  
Sayabek K. Sakhiyev
Keyword(s):  
Angular Distribution ◽  
Quark Model ◽  
Scalar Meson ◽  
Form Factors ◽  
Kinematical Region ◽  
Transition Form ◽  
B Decays ◽  
Straightforward Calculation ◽  
Scalar Mesons ◽  
Covariant Quark Model

In the wake of exploring uncertainty in the full angular distribution of the [Formula: see text] caused by the presence of the intermediate scalar [Formula: see text] meson, we perform the straightforward calculation of the [Formula: see text] (S is a scalar meson) transition form factors in the full kinematical region within the covariant quark model. We restrict ourselves by the scalar mesons below 1 GeV: [Formula: see text]. As an application of the obtained results we calculate the widths of the semileptonic and rare decays [Formula: see text], [Formula: see text] and [Formula: see text]. We compare our results with those obtained in other approaches.

On the Calculation of Scalar Mesons in Functional Nonlinear Spinor Theory

1974 ◽  
Vol 29 (10) ◽  
pp. 1394-1406
Author(s):  
W. Bauhoff
Keyword(s):  
Integral Equation ◽  
Angular Momentum ◽  
Scalar Meson ◽  
Functional Space ◽  
Order Equation ◽  
Second Order ◽  
Nonlinear Spinor ◽  
Spinor Theory ◽  
First Order ◽  
Scalar Mesons

Abstract The formulation of nonlinear spinor theory in functional space is used for the calculation of scalar meson masses. The second order equation used, requires an explicit angular momentum reduction. For illustration, this method is also applied to the first order equation. In second order, we get an integral equation of the Bethe-Salpeter type which is solved in Fredholm approximation.

scholarly journals Scalar meson properties from D-meson decays

2007 ◽  
Vol 790 (1-4) ◽  
pp. 510c-513c
Author(s):  
B. El-Bennich ◽  
O.M.A. Leitner ◽  
B. Loiseau ◽  
J.-P. Dedonder
Keyword(s):  
Scalar Meson ◽  
D Meson ◽  
Meson Decays

scholarly journals PROBING SCALAR MESON STRUCTURES IN χc1 DECAYS INTO PSEUDOSCALAR AND SCALAR

2012 ◽  
Vol 27 (23) ◽  
pp. 1250135 ◽  
Author(s):  
QIAN WANG ◽  
GANG LI ◽  
QIANG ZHAO
Keyword(s):  
Quark Model ◽  
Scalar Meson ◽  
Branching Ratios ◽  
Decay Process ◽  
Final State ◽  
Great Opportunity ◽  
Scalar Mesons ◽  
Pseudoscalar Mesons ◽  
Parametrization Scheme ◽  
Light Mesons

We evaluate the decay branching ratios of χc1 → PS, in a quark model parametrization scheme, where P and S stand for pseudoscalar and scalar meson, respectively. An interesting feature of this decay process is that the [Formula: see text] annihilate via the pQCD hair-pin diagram is supposed to be dominant. Hence, this decay process should be sensitive to the quark components of the final-state light mesons, and would provide a great opportunity for testing the mixing relations among the scalar mesons, i.e. f0(1370), f0(1500) and f0(1710), by tagging the final state pseudoscalar mesons.

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