Leading two-body weak-decay modes of λb

1981 ◽  
Vol 32 (7) ◽  
pp. 193-197 ◽  
Author(s):  
B. Guberina ◽  
D. Tadić ◽  
J. Trampetić
Keyword(s):  
Weak Decay ◽  
Decay Modes

scholarly journals Charmed $$\Omega _c$$ weak decays into $$\Omega $$ in the light-front quark model

2020 ◽  
Vol 80 (11) ◽  
Author(s):  
Yu-Kuo Hsiao ◽  
Ling Yang ◽  
Chong-Chung Lih ◽  
Shang-Yuu Tsai
Keyword(s):  
Quark Model ◽  
Recent Observation ◽  
Branching Fractions ◽  
Form Factors ◽  
Weak Decay ◽  
Current Data ◽  
Light Front ◽  
Transition Form ◽  
Decay Modes ◽  
Weak Decays

AbstractMore than ten $$\Omega _c^0$$ Ω c 0 weak decay modes have been measured with the branching fractions relative to that of $$\Omega ^0_c\rightarrow \Omega ^-\pi ^+$$ Ω c 0 → Ω - π + . In order to extract the absolute branching fractions, the study of $$\Omega ^0_c\rightarrow \Omega ^-\pi ^+$$ Ω c 0 → Ω - π + is needed. In this work, we predict $${{\mathcal {B}}}_\pi \equiv {{\mathcal {B}}}(\Omega _c^0\rightarrow \Omega ^-\pi ^+)=(5.1\pm 0.7)\times 10^{-3}$$ B π ≡ B ( Ω c 0 → Ω - π + ) = ( 5.1 ± 0.7 ) × 10 - 3 with the $$\Omega _c^0\rightarrow \Omega ^-$$ Ω c 0 → Ω - transition form factors calculated in the light-front quark model. We also predict $${{\mathcal {B}}}_\rho \equiv {{\mathcal {B}}}(\Omega _c^0\rightarrow \Omega ^-\rho ^+)=(14.4\pm 0.4)\times 10^{-3}$$ B ρ ≡ B ( Ω c 0 → Ω - ρ + ) = ( 14.4 ± 0.4 ) × 10 - 3 and $${{\mathcal {B}}}_e\equiv {{\mathcal {B}}}(\Omega _c^0\rightarrow \Omega ^-e^+\nu _e)=(5.4\pm 0.2)\times 10^{-3}$$ B e ≡ B ( Ω c 0 → Ω - e + ν e ) = ( 5.4 ± 0.2 ) × 10 - 3 . The previous values for $${{\mathcal {B}}}_\rho /{{\mathcal {B}}}_\pi $$ B ρ / B π have been found to deviate from the most recent observation. Nonetheless, our $${{\mathcal {B}}}_\rho /{{\mathcal {B}}}_\pi =2.8\pm 0.4$$ B ρ / B π = 2.8 ± 0.4 is able to alleviate the deviation. Moreover, we obtain $${{\mathcal {B}}}_e/{{\mathcal {B}}}_\pi =1.1\pm 0.2$$ B e / B π = 1.1 ± 0.2 , which is consistent with the current data.

Weak Decay Modes of Charmed Mesons

1976 ◽  
Vol 36 (22) ◽  
pp. 1287-1290 ◽  
Author(s):  
S. R. Borchardt ◽  
V. S. Mathur
Keyword(s):  
Weak Decay ◽  
Charmed Mesons ◽  
Decay Modes

THE LAST RESULTS FROM THE FINUDA EXPERIMENT

2013 ◽  
Vol 28 (32) ◽  
pp. 1330029 ◽  
Author(s):  
ALESSANDRO FELICIELLO
Keyword(s):  
Experimental Evidence ◽  
Systematic Study ◽  
Weak Decay ◽  
Magnetic Spectrometer ◽  
Decay Modes ◽  
Extensive Program ◽  
Hypernuclear Physics

FINUDA was a complex magnetic spectrometer installed on the DAΦNE e+e- collider, the Italian ϕ-factory put in operation at the INFN National Laboratories of Frascati, near Rome. It was carefully designed and specially dedicated to an extensive program of hypernuclear physics, mainly focussed on spectroscopy of light Λ-hypernuclei and on systematic study of their decay modes. Among the latest FINUDA results, of particular importance are the first observation of the neutron-rich Λ-hypernucleus [Formula: see text] and the first experimental evidence of the so-called hypernucleus two-nucleon induced non-mesonic weak decay.

The electromagnetic decay of the T = 3/2 states in19F

1976 ◽  
Vol 54 (9) ◽  
pp. 938-943 ◽  
Author(s):  
D. W. O. Rogers ◽  
A. L. Carter ◽  
T. J. M. Symons ◽  
S. P. Dolan ◽  
N. Anyas-Weiss ◽  
...  
Keyword(s):  
Shell Model ◽  
Weak Decay ◽  
Model Calculations ◽  
Electromagnetic Decay ◽  
Decay Modes ◽  
Upper Limits ◽  
Gamma Decay

The gamma-decay modes of the first two T = 3/2 levels in 19F at Ex = 7538 ± 2 and 7659 ± 2 keV have been studied at resonances in the 15N(α, γ)19F reaction at Eα = 4.465 and 4.618 MeV. Several weak decay branches have been seen: 7.54 → 5.11 MeV, 1.7 ± 0.4%; 7.54 → 1.35 MeV, 1.2 ± 0.4%; 7.66 → 4.55 MeV, 5.1 ± 0.3%; 7.66 → 5.11 MeV, 5.9 ± 0.5%. Comparison with (sd)3 shell model calculations indicate that the 4.55 and 5.11 MeV levels can be associated with the second and third calculated 5/2+ states. Using the DSAM, upper limits have been set on several lifetimes: 4377 ± 1 keV, < 22 fs; 4548 ± 2 keV, < 50 fs; 5105 ± 2 keV, < 30 fs.

scholarly journals Hyperons: the strange ingredients of the nuclear equation of state

2018 ◽  
Vol 474 (2217) ◽  
pp. 20180145 ◽  
Author(s):  
Isaac Vidaña
Keyword(s):  
Equation Of State ◽  
Neutron Stars ◽  
Weak Decay ◽  
Effective Field ◽  
Meson Exchange ◽  
Decay Modes ◽  
Nuclear Equation Of State ◽  
Nuclear Systems ◽  
Consequent Reduction ◽  
Recent Developments

We review the role and properties of hyperons in finite and infinite nuclear systems. In particular, we present different production mechanisms of hypernuclei, as well as several aspects of hypernuclear γ -ray spectroscopy, and the weak decay modes of hypernuclei. Then we discuss the construction of hyperon–nucleon and hyperon–hyperon interactions on the basis of the meson-exchange and chiral effective field theories. Recent developments based on the so-called V low  k approach and lattice quantum chromodynamics will also be addressed. Finally, we go over some of the effects of hyperons on the properties of neutron and proto-neutron stars with an emphasis on the so-called ‘hyperon puzzle’, i.e. the problem of the strong softening of the equation of state, and the consequent reduction of the maximum mass, induced by the presence of hyperons, a problem which has become more intriguing and difficult to solve due the recent measurements of approximately 2 M ⊙ millisecond pulsars. We discuss some of the solutions proposed to tackle this problem. We also re-examine the role of hyperons on the cooling properties of newly born neutron stars and on the development of the so-called r-mode instability.

Lifetimes and weak-decay modes of Λ hypernuclei

1998 ◽  
Vol 629 (1-2) ◽  
pp. 412-415 ◽  
Author(s):  
H.C. Bhang ◽  
S. Ajimura ◽  
K. Aoki ◽  
T. Hasegawa ◽  
O. Hashimoto ◽  
...  
Keyword(s):  
Weak Decay ◽  
Decay Modes

scholarly journals Hyperons in Finite and Infinite Nuclear Systems

Universe ◽  
2021 ◽  
Vol 7 (10) ◽  
pp. 376
Author(s):  
Isaac Vidaña
Keyword(s):  
Neutron Stars ◽  
Weak Decay ◽  
Theoretical Description ◽  
Mode Instability ◽  
Decay Modes ◽  
Nuclear Systems ◽  
Γ Ray ◽  
Production Mechanisms

In this work, we shortly review the role and properties of hyperons in finite and infinite nuclear systems such as hypernuclei and neutron stars. Particularly, we describe different production mechanisms of hypernuclei, discuss some aspects of their γ-ray spectroscopy and their weak decay modes, and give a few strokes on their theoretical description. We reexamine also the role played by hyperons on the properties of neutron and proto-neutron stars with a special emphasis on the well-known “hyperon puzzle”, of which we discuss some of the solutions that have been proposed to tackle this problem. Finally, we review the role of hyperons on the cooling properties of newly born neutron stars and on the so-called r-mode instability.

Experimental upper limits on branching fractions for unexpected decay modes of theτlepton

1982 ◽  
Vol 25 (11) ◽  
pp. 2869-2886 ◽  
Author(s):  
K. G. Hayes ◽  
M. L. Perl ◽  
M. S. Alam ◽  
A. M. Boyarski ◽  
M. Breidenbach ◽  
...  
Keyword(s):  
Branching Fractions ◽  
Decay Modes ◽  
Upper Limits

scholarly journals An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Yudai Ichikawa ◽  
Junko Yamagata-Sekihara ◽  
Jung Keun Ahn ◽  
Yuya Akazawa ◽  
Kanae Aoki ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Binding Energy ◽  
Decay Channel ◽  
Peak Shift ◽  
Bound State ◽  
Elastic Peak ◽  
Missing Mass ◽  
Decay Modes ◽  
Kaon Momentum ◽  
First Time

Abstract We have measured, for the first time, the inclusive missing-mass spectrum of the $^{12}$C$(K^-, p)$ reaction at an incident kaon momentum of 1.8 GeV/$c$ at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak ($K^-p \rightarrow K^-p$) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green’s function method by assuming different values of the parameters for the $\bar{K}$–nucleus optical potential. We found that the spectrum shape in the binding-energy region $-300 \, \text{MeV} &lt; B_{K} &lt; 40$ MeV is best reproduced with the potential depths $V_0 = -80$ MeV (real part) and $W_0 = -40$ MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around $B_{K} \sim 100$ MeV, where the major decay channel of $K^- NN \to \pi\Sigma N$ is energetically closed, and the non-mesonic decay modes ($K^- NN \to \Lambda N$ and $\Sigma N$) should mainly contribute. The enhancement is fitted well by a Breit–Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a $Y^{*}$-nucleus system.

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