Search results for "Sigma0"

showing 10 items of 16 documents

The radiative decay of the Lambda(1405) and its two-pole structure

2007

We evaluate theoretically the radiative decay widths into $\gamma\Lambda$ and $\gamma\Sigma^0$ of the two poles of the $\Lambda(1405)$ found in chiral unitary theories and we find quite different results for each of the two poles. We show that, depending on which reaction is used to measure the $\Lambda(1405)$ radiative decays, one gives more weight to one or the other pole, resulting in quite different shapes in the $\gamma\Lambda(\Sigma^0)$ invariant mass distributions. Our results for the high-energy pole agree with those of the empirical determination of the $\gamma\Lambda$ and $\gamma\Sigma^0$ radiative widths (based on an isobar model fitting of the $K^-p$ atom data), which are someti…

Nuclear and High Energy PhysicsParticle physicsRadiative decayStructure (category theory)radiative decay [Lambda(1405)]chiral [perturbation theory]Lambda(Sigma0 photon) [mass spectrum]Measure (mathematics)Lambda(1405) --> Lambda photonK- p --> Lambda pi0 photonK- p --> Sigma0 pi0 photonAtompi- p --> Lambda K0 photonpi- p --> Sigma0 K0 photonRadiative transferddc:530Invariant massnumerical calculationsPhysicsLambda(1405) --> Sigma0 photonSigma0inelastic scattering [K- p]Físicapole [approximation]hadroproduction [Lambda(1405)]High Energy Physics - Phenomenology(Lambda photon) [mass spectrum]Isobarinelastic scattering [pi- p]hadroproduction [hyperon]width [Lambda(1405)]
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Searching for signatures around 1920 MeV of a N-* state of three hadron nature

2009

We provide a series of arguments which support the idea that the peak seen in the gamma p -> K+ Lambda reaction around 1920 MeV should correspond to the recently predicted state of J(P) = 1/2(+) as a bound state of K(K) over bar N with a mixture of alpha(0)(980)N and f(0)(980)N components. At the same time we propose polarization experiments in that reaction as a further test of the prediction, as well as a study of the total cross-section for gamma p -> K(+)K(-)p at energies close to threshold and of d sigma/dM(inv) for invariant masses close to the two-kaon threshold.

associated production [K+]Nuclear and High Energy PhysicsParticle physicsNuclear TheoryHadronFOS: Physical sciences01 natural sciencesNuclear Theory (nucl-th)photon p --> Sigma0 K+0103 physical sciencesBound stateddc:530angular distributionbound state [K]010306 general physicstotal cross section(nucleon K anti-K) [bound state]Physicspolarizationhadroproduction [Lambda]intermediate state [f0(980)]photon p --> p K+ K-010308 nuclear & particles physicsFísica(1920) [nucleon resonance]Sigmaintermediate state [a0(980)]Polarization (waves)exclusive reaction [photon p]interpretation of experimentsproposed experimentphoton p --> Lambda K+
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"K0S0_dcs02" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"

2022

Excitation function at cos(Theta_K+)cm = -0.7

PhotoproductionGAMMA P --> K+ SIGMA0Exclusive
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"K0S0_dcs12" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"

2022

Excitation function at cos(Theta_K+)cm = 0.3

PhotoproductionGAMMA P --> K+ SIGMA0Exclusive
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"K0S0_dcs04" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"

2022

Excitation function at cos(Theta_K+)cm = -0.5

PhotoproductionGAMMA P --> K+ SIGMA0Exclusive
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"K0S0_dcs13" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"

2022

Excitation function at cos(Theta_K+)cm = 0.4

PhotoproductionGAMMA P --> K+ SIGMA0Exclusive
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"Table 2" of "Investigation of the p-$\Sigma^{0}$ interaction via femtoscopy in pp collisions"

2020

Measured correlation function of p$-\Sigma^{0}$p $\oplus$ $\overline{\mathrm{p}}-\overline{\Sigma^{0}}$

P P --> PBAR SIGMA0BAR X13000.0CORRP P --> P SIGMA0 X
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"K0S0_dcs05" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"

2022

Excitation function at cos(Theta_K+)cm = -0.4

PhotoproductionGAMMA P --> K+ SIGMA0Exclusive
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"K0S0_dcs01" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"

2022

Excitation function at cos(Theta_K+)cm = -0.8

PhotoproductionGAMMA P --> K+ SIGMA0Exclusive
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"K0S0_dcs10" of "$K^+\Lambda$ and $K^+\Sigma^0$ photoproduction with fine center-of-mass energy resolution"

2022

Excitation function at cos(Theta_K+)cm = 0.1

PhotoproductionGAMMA P --> K+ SIGMA0Exclusive
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