scholarly journals Comment on the X(3915) nonstandard hadron candidate

2019 ◽  
Vol 212 ◽  
pp. 02009 ◽  
Author(s):  
Stephen Lars Olsen
Keyword(s):  
Experimental Evidence ◽  
Decay Width ◽  
Partial Decay Width ◽  
Charmonium State ◽  
Radial Excitation ◽  
Order Of Magnitude

I review the experimental evidence for the X(3915), the candidate nonstandard meson associated with ωJ/ψ resonance-like peaks in B → KωJ/ψ and γγ → ωJ/ψ near M(ωJ/ψ) = 3920 MeV, and address the conjecture that it can be identified as the χ′c2, the radial excitation of the χc2 charmonium state. Since the partial decay width for B → KX(3915) is at least an order-of-magnitude higher than that for B → Kχc2, its assignment as the χ’c2 is dubious.

MEASUREMENT OF THE TWO-PHOTON DECAY WIDTH OF THE INTERMEDIATE MASS HIGGS BOSONS IN A PHOTON-PHOTON COLLIDER

1998 ◽  
Vol 13 (14) ◽  
pp. 2411-2416 ◽  
Author(s):  
T. OHGAKI ◽  
T. TAKAHASHI ◽  
I. WATANABE ◽  
T. TAUCHI
Keyword(s):  
Higgs Boson ◽  
Decay Width ◽  
Statistical Error ◽  
Higgs Bosons ◽  
Partial Decay Width ◽  
Intermediate Mass ◽  
Two Photon ◽  
Photon Decay ◽  
Photon Collider ◽  
B Quark

The feasibility of a measurement of the partial decay width of the intermediate-mass Higgs boson(MH=120 GeV ) into two photons at a photon-photon collider is studied by a simulation. It is found that the two-photon decay width can be measured with the statistical error of 7.6% with the integrated luminosity of 10fb-1. We also discussed a possibility toward further improvement with sophisticated b-quark tagging technique.

New Results on Double Charmonium Production in e+e- Annihilation at $\sqrt{s} \approx 10.6~{\rm GeV}$ with the Belle Detector

2005 ◽  
Vol 20 (16) ◽  
pp. 3617-3620
Author(s):  
◽  
T. Ziegler
Keyword(s):  
Cross Section ◽  
Strong Evidence ◽  
Previous Analysis ◽  
Charmonium State ◽  
Data Set ◽  
Charmonium Production ◽  
Belle Detector ◽  
Theoretical Predictions ◽  
Order Of Magnitude ◽  
The Cross

Extending a previous analysis1 the double charmonium production [Formula: see text] and [Formula: see text] has been investigated with a data set of 155 fb-1 with the Belle detector. Theoretical predictions for the cross section are one order of magnitude lower than the measured value and this discrepancy is still not understood. In a very recent update with a dataset of 285 fb-1 strong evidence for a new charmonium state at a mass of 3.940 GeV was found.

scholarly journals Strong decays of the $$\varXi (1620)^0$$ as a $$\varLambda {\bar{K}}$$ and $$\varSigma {\bar{K}}$$ molecule

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Yin Huang ◽  
Lisheng Geng
Keyword(s):  
Decay Width ◽  
Decay Channel ◽  
Molecular State ◽  
The Other ◽  
Partial Decay Width ◽  
Total Width ◽  
Strong Decay ◽  
Spin Parity

AbstractIn this work, we study the strong decays of the newly observed $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 assuming that it is a meson-baryon molecular state of $$\varLambda {\bar{K}}$$ Λ K ¯ and $$\varSigma {\bar{K}}$$ Σ K ¯ . We consider four possible spin-parity assignments $$J^P=1/2^{\pm }$$ J P = 1 / 2 ± and $$3/2^{\pm }$$ 3 / 2 ± for the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 , and evaluate its partial decay width into $$\varXi \pi $$ Ξ π and $$\varXi \pi \pi $$ Ξ π π via hadronic loops with the help of effective Lagrangians. In comparison with the Belle data, the calculated decay width favors the spin-party assignment $$1/2^-$$ 1 / 2 - while the other spin-parity assignments do not yield a decay width consistent with data in the molecule picture. We find that about 52–68% of the total width comes from the $${\bar{K}}\varLambda $$ K ¯ Λ channel, while the rest is provided by the $${\bar{K}}\varSigma $$ K ¯ Σ channel. As a result, both channels are important in explaining the strong decay of the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 . In addition, the transition $$\varXi (1620)^0\rightarrow \pi \varXi $$ Ξ ( 1620 ) 0 → π Ξ is the main decay channel in the $$J^{P}=1/2^{-}$$ J P = 1 / 2 - case, which almost saturates the total width. These information are helpful to further understand the nature of the $$\varXi (1620)^0$$ Ξ ( 1620 ) 0 .

scholarly journals Searching for new physics in semi-leptonic baryon decays

2017 ◽  
Vol 32 (08) ◽  
pp. 1750043 ◽  
Author(s):  
E. Di Salvo ◽  
Z. J. Ajaltouni
Keyword(s):  
Standard Model ◽  
Decay Width ◽  
Form Factors ◽  
New Physics ◽  
Scalar Coupling ◽  
Partial Decay Width ◽  
Beyond The Standard Model ◽  
Leptonic Decays ◽  
The Standard Model ◽  
Pseudo Scalar

We propose two different and complementary observables for singling out possible signals of physics beyond the Standard Model (SM) in the semi-leptonic decays [Formula: see text], both with the [Formula: see text] lepton and with a light lepton. The two observables are the partial decay width and a T-odd asymmetry, whose respective sensitivities to scalar and/or pseudo-scalar coupling are calculated as functions of the parameters characterizing new physics (NP). Two different form factors are used. Three particular cases are discussed and analyzed in detail.

The effect of parent substance genesis on the reactivity of active sodium carbonate towards sulphur dioxide

1979 ◽  
Vol 44 (4) ◽  
pp. 1201-1208 ◽  
Author(s):  
Karel Mocek ◽  
Erich Lippert ◽  
Dušan Husek ◽  
Emerich Erdös
Keyword(s):  
Experimental Evidence ◽  
Bulk Density ◽  
Rate Constant ◽  
Sodium Carbonate ◽  
Sulphur Dioxide ◽  
Effective Rate Constant ◽  
Effective Rate ◽  
Parent Substance ◽  
Active Sodium ◽  
Order Of Magnitude

The reactivity of sodium carbonate towards sulphur dioxide was studied in dependence on the effect of genesis of sodium hydrocarbonate as the parent substance of the reacting solid. The reactivity expressed by means of the effective rate constant differed approximately one half of order of magnitude among five various samples. A qualitative correlation has been found between the bulk density of the parent substance and the reactivity of active sodium carbonate prepared thereof. Experimental evidence is given that the effect of genesis of the parent substance is not decisive for the reactivity of the active sodium carbonate towards sulphur dioxide. Henceforth, as the decisive factor for the reactivity of the sodium carbonate the way of its preparation from the parent substance must be considered.

Partial decay width of theZinto three photons viaWloops

1992 ◽  
Vol 46 (11) ◽  
pp. 5074-5077 ◽  
Author(s):  
Fang-xiao Dong ◽  
Xiang-dong Jiang ◽  
Xian-jian Zhou
Keyword(s):  
Decay Width ◽  
Partial Decay Width

LONG DISTANCE V.H.F. FIELDS: II. REFRACTIVITY PROFILES CONTAINING "SHARP LAYERS"

1955 ◽  
Vol 33 (6) ◽  
pp. 316-346 ◽  
Author(s):  
F. H. Northover
Keyword(s):  
General Solution ◽  
Experimental Evidence ◽  
Atmospheric Turbulence ◽  
Physical Interpretation ◽  
Long Distance ◽  
Standard Type ◽  
Order Of Magnitude ◽  
Field Formation ◽  
Present Experimental Evidence

In this part the general solution developed in Part I is applied to the case in which the refractivity profile contains sharp layers (i.e. local regions where μ and dμ/dh change very rapidly compared with their rate of variation in a "standard" type atmosphere). It is found that such layers, when well developed, can cause distant fields of the order of magnitude of those which have been observed, but present experimental evidence seems to indicate that scattering from atmospheric turbulence is usually the important factor. An attempt is made to work out a physical interpretation of the field-formation below the elevated layer.

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