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.

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.

DOUBLY HEAVY EXOTICS

2014 ◽  
Vol 35 ◽  
pp. 1460432
Author(s):  
MAREK KARLINER
Keyword(s):  
Experimental Data ◽  
Experimental Evidence ◽  
Light Quark ◽  
Bound State ◽  
Exotic State ◽  
Decay Modes ◽  
Exotic States ◽  
Quantum Numbers ◽  
Heavy Baryons ◽  
Molecular Picture

During the last three years strong experimental evidence from B and charm factories has been accumulating for the existence of exotic hadronic quarkonia, narrow resonances which cannot be made from a quark and an antiquark. Their masses and decay modes show that they contain a heavy quark-antiquark pair, but their quantum numbers are such that they must also contain a light quark-antiquark pair. The main theoretical challenge has been to determine the nature of these resonances. The main possibilities are that they are either "genuine tetraquarks", i.e. two quarks and two antiquarks within one confinement volume, or "hadronic molecules" of two heavy-light mesons. In the last few months there is more and more evidence in favor of the latter. I discuss the experimental data and its interpretation and provide fairly precise predictions for masses and quantum numbers of the additional exotic states which are naturally expected in the molecular picture but have yet to be observed. I also provide arguments in favor of the existence of an even more exotic state – a hypothetical deuteron-like bound state of two heavy baryons.

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 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

RECENT RESULTS ON MESONIC WEAK DECAY OF Λ-HYPERNUCLEI

2010 ◽  
Vol 19 (12) ◽  
pp. 2566-2572
Author(s):  
◽  
E. Botta ◽  
T. Bressani ◽  
F. De Mori ◽  
S. Marcello ◽  
...  
Keyword(s):  
Systematic Study ◽  
Weak Decay ◽  
Mesonic Decay

The FINUDA experiment has performed a systematic study of mesonic weak decay of p-shell Λ-hypernuclei. Recent results on the mesonic decay spectra and ratios are illustrated and discussed.

NEW RESULTS ON NONMESONIC WEAK DECAY OF Λ HYPERNUCLEI WITH FINUDA

2010 ◽  
Vol 19 (12) ◽  
pp. 2573-2578
Author(s):  
◽  
S. Bufalino ◽  
E. Botta ◽  
T. Bressani ◽  
F. De Mori ◽  
...  
Keyword(s):  
Systematic Study ◽  
Weak Decay ◽  
The Subject

The FINUDA experiment has performed a systematic study of the NonMesonic Weak Decay (NMWD) of Λ hypernuclei analizing all the data collected from 2003 up to 2007. The results of a measurement of the spectra of protons coming from the NMWD of [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are the subject of this paper.

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.

Sign in / Sign up

Export Citation Format

Share Document