Differential cross section and recoil polarization measurements for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mi>Λ</mml:mi></mml:mrow></mml:math>reaction using CLAS at Jefferson Lab

McCracken, M. E.; Bellis, M.; Meyer, C. A.; Williams, M.; Adhikari, K. P.; Anghinolfi, M.; Ball, J.; Battaglieri, M.; Berman, B. L.; Biselli, A.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Burkert, V. D.; Careccia, S. L.; Carman, D. S.; Cole, P. L.; Collins, P.; Credé, V.; D’Angelo, A.; Daniel, A.; Dashyan, N.; Vita, R. De; Sanctis, E. De; Deur, A.; Dey, B.; Dhamija, S.; Dickson, R.; Djalali, C.; Doughty, D.; Dugger, M.; Dupré, R.; Alaoui, A. El; Eugenio, P.; Fegan, S.; Fradi, A.; Gabrielyan, M.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gohn, W.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Hafidi, K.; Hakobyanm, H.; Hanretty, C.; Hassall, N.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Jo, H. S.; Keller, D.; Khandaker, M.; Khetarpal, P.; Kim, W.; Klein, A.; Klein, F. J.; Kubarovsky, V.; Kuleshov, S.; Kuznetsov, V.; Livingston, K.; Mayer, M.; McAndrew, J.; McKinnon, B.; Mestayer, M. D.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Moreno, B.; Moriya, K.; Morrison, B.; Moutarde, H.; Munévar, E.; Nadel-Turoński, P.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Park, S.; Pasyuk, E.; Pereira, S. Anefalos; Perrin, Y.; Pisano, S.; Pogorelko, O.; Pozdniakov, S.; Price, J. W.; Procureur, S.; Prok, Y.; Protopopescu, D.; Quinn, B.; Raue, B. A.; Ricco, G.; Ripani, M.; Ritchie, Barry; Rosner, G.; Rossi, P.; Sabatié, F.; Saini, M. S.; Salamanca, J.; Schott, D.; Schumacher, R. A.; Seder, E.; Seraydaryan, H.; Sharabian, Y. G.; Sober, D. I.; Sokhan, D.; Stepanyan, S.; Stoler, P.; Strauch, S.; Taiuti, M.; Tedeschi, D. J.; Tkachenko, S.; Ungaro, M.; Vernarsky, B.; Vineyard, M. F.; Watts, D. P.; Voutier, E.; Weinstein, L. B.; Weygand, D. P.; Wood, M. H.; Zana, L.

doi:10.1103/physrevc.81.025201

Cited by 168 publications

(157 citation statements)

References 265 publications

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“…In Refs. [11,12], the Regge background for the p(γ,K + )Λ reaction was determined from the recent differential cross section and recoil polarization data by the CEBAF Large Acceptance Spectrometer (CLAS) Collaboration [16]. 2 More specifically, a Bayesian analysis was performed for the highenergy (W > 2.6 GeV) and forward-angle (cos θ * K > 0.35) part of these CLAS data (262 data points) to determine the Regge model variant with the highest evidence.…”

Section: A a Third Regge Trajectorymentioning

confidence: 99%

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K+Λelectroproduction above the resonance region

2014

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Background:In π + n and π − p electroproduction, conventional models cannot satisfactorily explain the data above the resonance region, in particular the transverse cross section. Although no high-energy L-T-separated cross-section data are available to date, a similar scenario can be inferred for K + Λ electroproduction. Purpose: Develop a phenomenological model for the p(γ * ,K + )Λ reaction at forward angles and high-energies. Propose a universal framework for interpreting charged-kaon and charged-pion electroproduction above the resonance region. Method: Guided by the recent model for charged-pion electroproduction, developed by the authors, a framework for K + Λ electroproduction at high energies and forward angles is constructed. To this end, a Reggeized background model for K + Λ photoproduction is first developed. This model is used as a starting base to set up an electroproduction framework. Results: The few available data of the unseparated p(γ * ,K + )Λ cross section are well explained by the model. Predictions for the L-T-separation experiment planned with the 12 GeV upgrade at Jefferson Lab are given. The newly proposed framework predicts an increased magnitude for the transverse structure function, similar to the situation in charged-pion electroproduction. Conclusions: Within a hadronic framework featuring Reggeized background amplitudes, s-channel resonanceparton effects can explain the observed magnitude of the unseparated p(γ * ,K + )Λ cross section at high energies and forward angles. Thereby, no hardening of the kaon electromagnetic form factor is required.

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Section: A a Third Regge Trajectorymentioning

confidence: 99%

“…[12], an overview is given of the available [16]. with α K 1 (1400) = 0.75 GeV −2 and α K * (1410) = 0.83 GeV −2 .…”

Section: A a Third Regge Trajectorymentioning

confidence: 99%

K+Λelectroproduction above the resonance region

2014

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“…A comprehensive set of measurements of differential cross sections, recoil polarizations and beam-recoil double polarisations, C x and C z , for the reactions γ p → K + and γ p → K + 0 has been carried out using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab [9][10][11][12][13]. Measurements of the beam asymmetry observable in these reactions have been reported by the LEPS [14] and GRAAL [15] Collaborations.…”

Section: Introductionmentioning

confidence: 99%

Photoproduction ofΛandΣ0hyperons using linearly polarized photons

Paterson¹,

Ireland²,

Livingston³

et al. 2016

Phys. Rev. C

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Background: Measurements of polarization observables for the reactions γ p → K + and γ p → K + 0 have been performed. This is part of a program of measurements designed to study the spectrum of baryon resonances in particular, and nonperturbative QCD in general. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits, which allow the study of strangeness in nucleon and nuclear systems. Beam-recoil observables for the γ p → K + 0 reaction have not been reported before now. Method: The measurements were carried out using linearly polarized photon beams incident on a liquid hydrogen target, and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71 < W < 2.19 GeV, with an angular range −0.75 < cos θ K < +0.85. Results: The observables extracted for both reactions are beam asymmetry , target asymmetry T , and the beam-recoil double polarization observables O x and O z .

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“…Although there is still some uncertainty regarding the production mechanism for the Λ, great progress has been made as a result of the aforementioned spin observable measurements. Collectively, cross section and polarization measurements [18,15] were necessary to identify the various mechanisms for Λ production, including the identification of numerous intermediate excited nucleon (N * ) resonances. We seek to make analogous measurements for the Ξ − to explore production and the contributing S = −1 hyperon spectrum.…”

Section: Surprising Experimental Results Have Been Reported By Bradfomentioning

confidence: 99%

“…During the g12 production runs, the magnet operated at a current of 1930A (corresponding to half capacity) with a half-maximum field of 1.75 T [18] and a polarity such that negatively charged particles are bent inward towards the beam line. The benefit of running at half field-strength was that it increased the efficiency of detecting negatively-charged particles.…”

Section: Superconducting Toroidal Magnetmentioning

confidence: 99%

First Time Measurements of Polarization Observables for the Charged Cascade Hyperon in Photoproduction

Bono

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Differential cross section and recoil polarization measurements for theγp→K+Λreaction using CLAS at Jefferson Lab

Cited by 168 publications

References 265 publications

K+Λelectroproduction above the resonance region

K+Λelectroproduction above the resonance region

Photoproduction ofΛandΣ0hyperons using linearly polarized photons

First Time Measurements of Polarization Observables for the Charged Cascade Hyperon in Photoproduction

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