Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p\to \varphi p$

Abstract

High-statistics measurements of differential cross sections and spin density matrix elements for the reaction $\gamma p\to \varphi p$ have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ($\sqrt{s}$) from 1.97 to 2.84 GeV, with an extensive coverage in the $\varphi$ production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the $\varphi$ natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged- ($\varphi \to K^{+}{K}^{-}$) and neutral- ($\varphi \to K_S^0{K}_L^0$) $K\overline{K}$ decay modes of the $\varphi$. Further, for the charged mode, we differentiate between the cases where the final $K^{-}$ track is directly detected or its momentum reconstructed as the total missing momentum in the event. The two charged-mode topologies and the neutral-mode have different resolutions and are calibrated against each other. Extensive usage is made of kinematic fitting to improve the reconstructed $\varphi$ mass resolution. Our final results are reported in 10- and mostly 30-MeV-wide $\sqrt{s}$ bins for the charged- and the neutral-mode, respectively. Possible effects from $K^{+}{\Lambda }^{\ast }$ channels with $pK\overline{K}$ final-states are discussed. These present results constitute the most precise and extensive $\varphi$ photoproduction measurements to date and in conjunction with the $\omega$ photoproduction results recently published by CLAS, will greatly improve our understanding of low energy vector meson photoproduction.

38 pages, 36 figures. arXiv admin note: substantial text overlap with arXiv:1006.0374

References in corpus (25)

• Differential cross section and recoil polarization measurements for the gamma p to K+ Lambda reaction using CLAS at Jefferson Lab
• Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)
• Diffractive $\varphi$-meson photoproduction on proton near threshold
• Differential cross sections for the reactions gamma p-> p eta and gamma p -> p eta-prime
• Measurement of Elastic $\varphi$ Photoproduction at HERA
• Differential Photoproduction Cross Sections of the Sigma0(1385), Lambda(1405), and Lambda(1520)
• Differential cross sections and recoil polarizations for the reaction gamma p -> K+ Sigma0
• Photoproduction of phi(1020) mesons on the proton at large momentum transfer
• Differential cross sections and spin density matrix elements for the reaction gamma p -> p omega
• Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA
• Spin effects and baryon resonance dynamics in phi-meson photoproduction at few GeV
• Partial wave analysis of the reaction gamma p -> p omega$ and the search for nucleon resonances
• Polarization observables in vector meson photoproduction
• Measurement of the D*(2010)+ meson width and the D*(2010)+ - D0 mass difference
• Multivariate side-band subtraction using probabilistic event weights
• $\varphi$ photoprodution with coupled-channel effects
• Is the nonmonotonic behavior in the cross section of phi photoproduction near threshold a signature of a resonance?
• Measurement of Spin-Density Matrix Elements for $\varphi$-Meson Photoproduction from Protons and Deuterons Near Threshold
• A coupled-channel analysis for phi-photoproduction with Lambda(1520)
• Numerical Object Oriented Quantum Field Theory Calculations
• On the near-threshold peak structure in the differential cross section of ϕ-meson photoproduction: indication of a missing resonance with non-negligible strangeness content
• Measurement of the D*(2010)+ natural line width and the D*(2010)+ - D0 mass difference
• Spin Information from Vector-Meson Decay in Photoproduction
• Tensor Polarization of the phi meson Photoproduced at High t
• K Kbar photoproduction and S-P wave interference

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• Do the $P_c^{+}$ Pentaquarks Have Strange Siblings?
• Comparative analysis of $\omega p$, $\varphi p$, and $J/\psi p$ scattering lengths from A2, CLAS, and GlueX threshold measurements
• Triangular singularity and a possible $\varphi p$ resonance in the ${\Lambda }_c^{+}\to {\pi }^0\varphi p$ decay
• Towards a complete study of central exclusive production of $K^{+}{K}^{-}$ pairs in proton-proton collisions within the tensor Pomeron approach
• Search for a hidden strange baryon-meson bound state from $\varphi$ production in a nuclear medium
• Photoproduction of the $f_1(1285)$ Meson
• $\varphi$-meson lepto-production near threshold and the strangeness $D$-term
• $\varphi$ meson transparency in nuclei from $\varphi N$ resonant interactions
• Search for ${\Lambda }_c^{+}\to \varphi p{\pi }^0$ and branching fraction measurement of ${\Lambda }_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0$
• Interference effect between $\varphi$ and $\Lambda (1520)$ production channels in the $\gamma p\to K^{+}{K}^{-}p$ reaction near threshold
• Hyperon I: Partial wave amplitudes for $K^{-}p$ scattering
• The $\varphi (2170)$ production in the process $\gamma p\to \eta \varphi p$
• $\varphi$ photoproduction on the proton at $E_{\gamma }$ = 1.5 - 2.9 GeV
• First measurement of coherent $\varphi$-meson photoproduction from helium-4 near threshold
• Searching for the odderon in $pp\to pp{K}^{+}{K}^{-}$ and $pp\to pp{\mu }^{+}{\mu }^{-}$ reactions in the $\varphi (1020)$ resonance region at the LHC
• The ${\psi }^{(\ast )}p$ scattering length based on near-threshold charmoniums photoproduction
• Role of $\sigma$ exchange in the $\gamma p\to \varphi p$ process and scaling with the $f_1$ axial vector meson from a Reggeized model
• Nucleon Resonance Physics
• Double-Regge Exchange Limit for the $\gamma p\to K^{+}{K}^{-}p$ Reaction
• First extraction of the proton mass radius and scattering length $\left|{\alpha }_{{\rho }^{0}p}\right|$ from ${\rho }^0$ photoproduction
• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
• Diquark Substructure in $\varphi$ Photoproduction
• Pomeron, nucleon-resonance, and $(0^{+},0^{-},1^{+})$-meson contributions in $\varphi$-meson photoproduction
• Mass radius and mechanical properties of the proton via strange $\varphi$ meson photoproduction
• Diffractive Vector Photoproduction using Holographic QCD
• Photoproduction of $K^{+}{K}^{-}$ meson pairs on the proton
• On the near-threshold incoherent $\varphi$ photoproduction on the deuteron: any trace of a resonance?
• Investigation of electroproduction of $\varphi$ mesons off protons
• Spectrum and Structure of Excited Baryons with CLAS
• Analysis of the interaction between $\varphi$ meson and nucleus
• Studies on the $K^{\ast }\Sigma$ bound-state via $K^{+}p\to K^{+}\varphi p$
• The $\varphi NN,J/\psi NN,{\eta }_{c}NN$ systems based on HAL QCD interactions
• High Energy Behaviour of Light Meson Photoproduction
• Decay behavior of hidden-strange hadronic molecular state $N(2270)$
• Pseudoscalar and Scalar Meson Photoproduction Interpreted by Regge Phenomenology
• Mass-dependent cuts in longitudinal phase space
• First polarisation measurement of coherently photoproduced J/$\psi$ in ultra-peripheral Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Measurement of Spin-Density Matrix Elements in $\varphi (1020)\to K_S^0{K}_L^0$ Photoproduction with a Linearly Polarized Photon Beam at $E_{\gamma }=8.2-8.8$ GeV
• Threshold Upsilon-meson Photoproduction at EIC and EicC
• Extraction of $t$-slopes from experimental $\gamma p\to K^{+}\Lambda$ and $\gamma p\to K^{+}{\Sigma }_0$ cross section data
• Backward-angle electroproduction of ${\eta }^{\prime }$ mesons off protons at $W=2.13\text{GeV}$ and $Q^2=0.46{\left(\text{GeV}/c\right)}^2$