Differential Cross Sections for gamma + p --> K+ + Y for Lambda and Sigma0 Hyperons

Abstract

High-statistics cross sections for the reactions gamma + p --> K^+ + Lambda and gamma + p --> K^+ + Sigma^0 have been measured using CLAS at Jefferson Lab for center-of-mass energies W between 1.6 and 2.53 GeV, and for -0.85 < cos theta_{K^+}^{c.m.}< +0.95. In the K^+ Lambda channel we confirm a resonance-like structure near W=1.9 GeV at backward kaon angles. The position and width of this structure change with angle, indicating that more than one resonance is likely playing a role. The K^+ Lambda channel at forward angles and all energies is well described by a t-channel scaling characteristic of Regge exchange, while the same scaling applied to the K^+ Sigma^0 channel is less successful. Several existing theoretical models are compared to the data, but none provide a good representation of the results.

26 pages, 26 figures

References in corpus (19)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The light baryon spectrum in a relativistic quark model with instanton-induced quark forces I. The non-strange baryon spectrum and ground-states
• Measurement of gamma p --> K+ Lambda and gamma p --> K+ Sigma0 at photon energies up to 2.6 GeV
• Evidence for a missing nucleon resonance in kaon photoproduction
• Analysis of Pion Photoproduction Data
• Hyperon Photoproduction in the Nucleon Resonance Region
• Vector meson production and nucleon resonance analysis in a coupled-channel approach for energies m_N < sqrt(s) < 2 GeV II: photon-induced results
• Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)Sigma0 reactions at Egamma=1.5-2.4 GeV
• Decays of Baryon Resonances into K Lambda, K^+ Sigma^0 and K^0 Sigma^+
• Kaon photoproduction: background contributions, form factors and missing resonances
• A coupled-channel analysis of $K\Lambda$ production in the nucleon resonance region
• Separation of the Longitudinal and Transverse Cross Sections in the p(ee'K)Lambda and p(ee'K)Sigma Reactions
• The role of hyperon resonances in p(gamma,K+)Lambda processes
• A mass formula for baryon resonances
• A Genetic Algorithm Analysis of N* Resonances in $p(\gamma ,K^{+})\Lambda$ Reactions
• Electroproduction of strangeness above the resonance region
• Extraction of N* information from the limited p(gamma,K+)Lambda data set
• Dynamical coupled-channel model of kaon-hyperon interactions
• From known to undiscovered resonances

Cited by in corpus (156)

• Baryon spectroscopy
• Progress Toward Understanding Baryon Resonances
• Coupled-channel dynamics in the reactions piN --> piN, etaN, KLambda, KSigma
• Differential cross section and recoil polarization measurements for the gamma p to K+ Lambda reaction using CLAS at Jefferson Lab
• First Measurement of Beam-Recoil Observables Cx and Cz in Hyperon Photoproduction
• ${\pi }^{+}$ photoproduction on the proton for photon energies from 0.725 to 2.875 GeV
• Differential Photoproduction Cross Sections of the Sigma0(1385), Lambda(1405), and Lambda(1520)
• Determining pseudoscalar meson photo-production amplitudes from complete experiments
• Dynamical coupled-channel approach to hadronic and electromagnetic production of kaon-hyperon on the proton
• Differential cross sections and recoil polarizations for the reaction gamma p -> K+ Sigma0
• Forward-angle K+ Lambda photoproduction in a Regge-plus-resonance approach
• ${\pi }^0$ photoproduction on the proton for photon energies from 0.675 to 2.875 GeV
• Measurement of beam-recoil observables Ox, Oz and target asymmetry for the reaction gamma p -> K Lambda
• Nucleon and Delta resonances in K Sigma(1385) photoproduction from nucleons
• N* and Delta* decays into N pi0 pi0
• A gauge invariant chiral unitary framework for kaon photo- and electroproduction on the proton
• Kaon photoproduction in a multipole approach
• Differential cross section and photon beam asymmetry for the gamma n -> K+ Sigma- reaction at Egamma=1.5-2.4 GeV
• Baryon resonances and polarization transfer in hyperon photoproduction
• Separated Structure Functions for the Exclusive Electroproduction of $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Final States
• $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ photoproduction with fine center-of-mass energy resolution
• Study of the reaction $\gamma p\to p{\pi }^0\eta$
• Nucleon resonance decay by the $K^0{\Sigma }^{+}$ channel
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons using linearly polarized photons
• Contribution of higher nucleon resonances to K*Λ photoproduction
• Light Baryon Spectroscopy
• Further evidence for N(1900)P_{13} from photoproduction of hyperons
• Near-threshold Lambda(1520) production by the gamma p -> K+Lambda(1520) reaction at forward K+ angles
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• Regge-plus-resonance treatment of the p(gamma,K^+)Sigma^0 and p(gamma,K^0)Sigma^+ reactions at forward kaon angles
• Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial wave analysis
• Bayesian inference of the resonance content of p(gamma,K^+)Lambda
• K^0 pi^0 Sigma^+ and K^*0 Sigma^+ photoproduction off the proton
• Scalar kappa meson in K* photoproduction
• Faddeev fixed-center approximation to the $N\bar{K}K$ system and the signature of a $N^{\ast }(1920)(1/2^{+})$ state
• A Bayesian analysis of kaon photoproduction with the Regge-plus-resonance model
• Pion- and photo-induced transition amplitudes to $\Lambda K$, $\Sigma K$, and $N\eta$
• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• Possible $\Sigma ({\frac{1}{2}}^{-})$ under the ${\Sigma }^{\ast }(1385)$ peak in $K{\Sigma }^{\ast }$ photoproduction
• $K\Lambda (1405)$ configuration of the $K\bar{K}N$ system
• Beam-Recoil Polarization Transfer in the Nucleon Resonance Region in the Exclusive $\vec{e}p\to e^{\prime }{K}^{+}\vec{\Lambda }$ and $\vec{e}p\to e^{\prime }{K}^{+}{\vec{\Sigma }}^0$ Reactions at CLAS
• P-wave excited baryons from pion- and photo-induced hyperon production
• Production of Lambda and Sigma^0 hyperons in proton-proton collisions
• Photoproduction of $K\Lambda$ on the proton
• Electromagnetic production of kaon near threshold
• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }{K}^{+})\Lambda$ in the Nucleon Resonance Region
• Electroproduction of kaons from the proton in a Regge-plus-resonance approach
• Nucleon resonances in the fourth resonance region
• Differential cross section of gamma n to K+ Sigma- on bound neutrons with incident photons from 1.1 to 3.6 GeV
• Evidence for the $N^{\prime }(1720)3/2^{+}$ Nucleon Resonance from Combined Studies of CLAS ${\pi }^{+}{\pi }^{-}p$ Photo- and Electroproduction Data
• Origin of the second peak in the cross section of the $K^{+}\Lambda$ photoproduction
• Photo- and electroproduction of $K^{+}\Lambda$ with unitarity-restored isobar model
• Coupled-channel analysis of $K\Sigma$ production on the nucleon up to 2.0 GeV
• Analysis of the consistency of kaon photoproduction data with Lambda in the final state
• First results on nucleon resonance photocouplings from the $\gamma p\to {\pi }^{+}{\pi }^{-}p$ reaction
• Regge phenomenology of pion photoproduction off the nucleon at forward angles
• A new perspective on the Faddeev equations and the $\bar{K}NN$ system from chiral dynamics and unitarity in coupled channels
• Lambda(1520) photoproduciton off the proton target with Regge contributions
• Photoproduction of the $f_1(1285)$ Meson
• Measurement of the $\vec{\gamma }p\to K^{+}\Lambda$ Reaction at Backward Angles
• The associated photoproduction of K+ meson off proton within a coupled-channels K-matrix approach
• Measurement of the Differential and Total Cross Sections of the $\gamma d\to K^0\Lambda (p)$ Reaction within the Resonance Region
• Results from the N* program at JLab
• The role of the N*(1535) resonance and the pi^- p --> KY amplitudes in the OZI forbidden pi N --> phi N reaction
• K0 photoproduction on the deuteron and the extraction of the elementary amplitude
• Electromagnetic production of $K\Sigma$ on the nucleon near threshold
• Cross sections and Rosenbluth separations in 1H(e, e'K+)Lambda up to Q2=2.35 GeV2
• Separated Structure Functions for Exclusive $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Electroproduction at 5.5 GeV with CLAS
• Evidence for the J^p=1/2^+ narrow state at 1650 MeV in the photoproduction of KLambda
• Photo- and Electroproduction of the Hypertriton on 3He
• Role of high-spin hyperon resonances in the reaction of $\gamma p\to K^{+}{K}^{+}{\Xi }^{-}$
• Cross sections for the $\gamma p\to K^{\ast +}\Lambda$ and $\gamma p\to K^{\ast +}{\Sigma }^0$ reactions measured at CLAS
• Energy-independent PWA of the reaction $\gamma p\to K^{+}\Lambda$
• Constraining the mass and width of the $N^{\ast }(1685)$ resonance
• K*Sigma photoproduction off the proton target with baryon resonances
• High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A
• Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron
• Exclusive electroproduction of K+ Lambda and K+ Sigma^0 final states at Q^2 = 0.030-0.055 (GeV/c)^2
• Study of nucleon resonances with electromagnetic interactions
• Electromagnetic Decay of the ${\Sigma }^0(1385)$ to $\Lambda \gamma$
• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons off protons with linearly polarized photons at $E_{\gamma }=1.5-3.0$ GeV
• $K^{+}\Lambda$ photoproduction at forward angles and low momentum transfer
• Experimental study of the $\gamma p\to K^0{\Sigma }^{+}$, $\gamma n\to K^0\Lambda$, and $\gamma n\to K^0{\Sigma }^0$ reactions at the Mainz Microtron
• Coupled $K^{+}\Lambda$ and $K^0\Lambda$ photoproduction off the nucleon: Consequences from the recent CLAS and MAMI data and the $N(1680)P_{11}$ narrow state
• New fits to the reaction $\gamma p\to K^{+}\Lambda$
• Coupling strength of the $N^{\ast }(1535)S_{11}$ to the $K^{+}\Lambda$ channel
• Scaling and Resonances in Elementary K^+ Lambda Photoproduction
• Evidence for the tensor meson exchange in the kaon photoproduction
• Are hyperon resonances required in the elementary $K^{+}\Lambda$ photoproduction?
• Polarization observables in exclusive kaon photoproduction on the deuteron
• N* Experiments and their Impact on Strong QCD Physics
• Photo-production of neutral kaons on 12C in the threshold region
• Exclusive Meson Photo- and Electro-production, a Window on the Structure of Hadronic Matter
• Positivity Constraints on Spin Observables in Exclusive Pseudoscalar Meson Photoproduction
• Induced polarization of Λ(1116) in kaon electroproduction
• High Resolution Hypernuclear Spectroscopy at Jefferson Lab Hall A
• Regge-plus-resonance predictions for kaon photoproduction from the neutron
• Extracting the pole and Breit-Wigner properties of nucleon and $\Delta$ resonances from the $\gamma N\to K\Sigma$ photoproduction
• Photoproduction of hypernuclei within the quark-meson coupling model
• Partial-Wave Analysis of $\gamma p\to K^{+}\Lambda$ using a multichannel framework
• Search for missing baryon resonances via associated strangeness photoproduction
• Studies on the polarization transfer coefficients C_x and C_z in the gamma p -> K^+ Lambda(1520,3/2^-) reaction process
• Pentaquark, cusp and rescattering in single kaon photoproduction off deuterium
• Beam-Recoil Transferred Polarization in $K^{+}Y$ Electroproduction in the Nucleon Resonance Region with CLAS12
• Polarization observables in the longitudinal basis for pseudo-scalar meson photoproduction using a density matrix approach
• Model discrimination in pseudoscalar-meson photoproduction
• Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV
• Nucleon Resonance Physics
• Magnetic interaction induced by the anomaly in kaon-photoproductions
• Polarization in Hyperon Photo- and Electro- Production
• Photoproduction of $K^{+}\Lambda$ with a Regge-plus-resonance model
• Theory of the electromagnetic production of hyperons
• Beam-Target Helicity Asymmetry $E$ in $K^0\Lambda$ and $K^0{\Sigma }^0$ Photoproduction on the Neutron
• Experimental techniques and performance of $\Lambda$-hypernuclear spectroscopy with the $(e,e^{\prime }{K}^{+})$ reaction
• Progress and Issues in the Electromagnetic Production of Kaon on the Nucleon
• Differential cross section and photon-beam asymmetry for the gamma p -> pi- Delta++(1232) reaction at forward pi- angles for Egamma=1.5-2.95 GeV
• Photoproduction of $K^{+}{K}^{-}$ meson pairs on the proton
• Photon induced K$\Lambda$ production on the proton in the low energy region
• Eta and kaon production in a chiral quark model
• Effect of the transfer reactions for 16O+10B elastic scattering
• Transverse Polarization of ${\Sigma }^{+}(1189)$ in Photoproduction on a Hydrogen Target in CLAS
• Effects of the higher partial waves and relativistic terms on the accuracy of the calculation of the hypertriton electroproduction
• Ridge regression for minimizing the couplings of hyperon resonances in the $K^{+}\Lambda$ photoproduction
• Spectral-fluctuations test of the quark-model baryon spectrum
• Spectrum and Structure of Excited Baryons with CLAS
• Baryon Resonances
• Gerasimov-Drell-Hearn Sum Rule and the Discrepancy between the New CLAS and SAPHIR Data
• Strangeness Electromagnetic Production on Nucleons and Nuclei
• CLAS+FROST: new generation of photoproduction experiments at Jefferson Lab
• Application of the single-channel, single-energy AA/PWA method to $K^{+}\Lambda$ photoproduction
• Two, three, many body systems involving mesons
• Evidence of the non-strange partner of pentaquark from the elementary $K^{+}\Lambda$ photoproduction
• Charged current (anti)neutrino induced eta production off the nucleon
• Laurent+Pietarinen Partial Wave Analysis
• Study of excited nucleons and their structure
• Hyperon Photo and Electro Production at CLAS
• Three-body hadron systems with strangeness
• Some Phenomenological Aspects of Kaon Photoproduction in the Extreme Kinematics
• Dynamically generated resonances
• Decay pion spectroscopy: a new approach
• The N* Physics Program at Jefferson Lab
• Single-channel, single-energy partial-wave analysis with continuity improved through minimal phase constraints
• Kaon photoproduction on the nucleon with constrained parameters
• A new N* resonance as a hadronic molecular state
• Analysis of the data for $\gamma p\to f_1(1285)p$ photoproduction
• Spectral-statistics properties of the experimental and theoretical light baryon and meson spectra
• Strangeness Physics with CLAS at JLab
• Coupled channel study of $K^{+}\Lambda$ photoproduction
• Measurement of Excited Hyperons in Photoproduction at CLAS
• Three body systems with strangeness and exotic systems
• Probing the nucleon structure with CLAS
• Measurement of polarisation transfer in hyperon photoproduction at MAMI
• Extraction of $t$-slopes from experimental $\gamma p\to K^{+}\Lambda$ and $\gamma p\to K^{+}{\Sigma }_0$ cross section data
• A Simple Quark Model for γp -> K^+ Λ^0
• Differential cross section analysis in kaon photoproduction using associated legendre polynomials