National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
Photo- and electro-production of kaons
Bydžovský, Petr
Isobar models for the electromagnetic production of K+ and K-0 are discussed with emphasis on the K-0 photoproduction off neutron. Predictions of the models for the K-0 photoproduction on deuteron are compared with the recent data and some properties of the elementary amplitudes are shown.
Neutral Kaon Photoproduction at LNS, Tohoku University
Kaneta, M. ; Chiga, N. ; Beckford, B. ; Ejima, M. ; Fujii, T. ; Fujii, Y. ; Fujibayashi, T. ; Gogami, T. ; Futatsukawa, K. ; Hashimoto, O. ; Hosomi, K. ; Hirose, K. ; Iguchi, A. ; Kameoka, S. ; Kanda, H. ; Kawama, D. ; Kawasaki, T. ; Kimura, C. ; Kiyokawa, S. ; Koike, T. ; Kon, T. ; Ma, Y. ; Maeda, K. ; Maruyama, N. ; Matsumura, A. ; Miyagi, Y. ; Miura, Y. ; Miwa, K. ; Nakamura, S. N. ; Nomura, H. ; Okuyama, A. ; Ohtani, A. ; Otani, T. ; Sato, M. ; Shichijo, A. ; Shirotori, K. ; Takahashi, T. ; Tamura, H. ; Taniya, N. ; Tsubota, H. ; Tsukada, K. ; Terada, N. ; Ukai, M. ; Uchida, D. ; Watanabe, T. ; Yamamoto, T. ; Yamauchi, H. ; Yokota, K. ; Ishikawa, T. ; Kinoshita, T. ; Miyahara, H. ; Nakabayashi, T. ; Shimizu, H. ; Suzuki, K. ; Tamae, T. ; Terasawa, T. ; Yamazaki, H. ; Han, Y. C. ; Wang, T. S. ; Sasaki, A. ; Konno, O. ; Bydžovský, Petr ; Sotona, Miloslav
The elementary photo-strangeness production process has been intensively studied based on the high-quality data of the charged kaon channel, gamma + p -> K+ + Lambda(Sigma(0)). However, there had been no reliable data for the neutral kaon channel gamma + n -> K-0 Lambda(Sigma(0)) and the theoretical investigations suffer seriously from the lack of the data. In order to have reliable data for the neutral kaon photo-production data, substantial effort has been made to measure the gamma + n -> K-0 + A process in the pi(+)pi(-) decay channel, using a liquid deuterium target and a tagged photon beam (E-gamma = 0.8-1.1 GeV) in the threshold region at the Laboratory of Nuclear Science (LNS), Tohoku University. We have taken exploratory data quite successfully with the use of Neutral Kaon Spectrometer (NKS) at LNS-Tohoku in 2003 and 2004. The data is compared to theoretical models and it indicates a hint that the K-0 differential cross section has a backward peak in the energy region. The second generation of the experiment, NKS2, is designed to extend the NKS experiment by considerably upgrading the original neutral kaon spectrometer, fully replacing the spectrometer magnet, tracking detectors and all the trigger counters. The new spectrometer NKS2 has significantly larger acceptance for neutral kaons compared with NKS, particularly covering forward angles and much better invariant mass resolution. The estimated acceptance of NKS2 is three (ten) times larger for K-S(0)(Lambda) than that of NKS. The spectrometer is newly constructed and installed at the Laboratory of Nuclear Science, Tohoku University in 2005. The deuterium target data was taken with tagged photon beam in 2006-2007. We will report recent results of NKS2 in this paper. Additionally, a status of the upgrade project that gives us larger acceptance and capability of K-0 + A coincidence measurement will be presented.
Diffractive Dijet Production with Leading Proton in ep Collisions at HERA.
Žlebčík, Radek ; Valkárová, Alice (advisor) ; Chýla, Jiří (referee) ; Levonian, Sergey (referee)
The cross section of the diffractive process e+p → e+Xp is measured at a centre-of-mass energies of 319 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction defined by photon virtualities Q2 < 2 GeV2 and in deep-inelastic scattering with 4 GeV2 < Q2 < 80 GeV2 . The results are compared to next-to-leading order QCD calculations based on diffractive parton distribution functions as extracted from measurements of inclusive cross sections in diffractive deep- inelastic scattering. A collinear QCD factorization theorem is tested against the measured cross sections and their ratios. 1
Analysis of Diffractive Open Charm Photoproduction with a Leading Proton at HERA
Jansová, Markéta ; Černý, Karel (advisor) ; Kepka, Oldřich (referee)
The diffractive open charm production is studied using data from 2006-2007, when the leading proton measurement by H1 Very Forward Proton Spectrometer was provided. The charm production is tagged by the decay products of D∗ meson. The cross section of e+ p → e+ D∗ X p in photoproduction regime defined by the value of virtuality Q2 < 2 GeV is determined and corrected for the detector effects. The diffractive D∗ meson photoproduction cross section is compared with the hadron level MC Rapgap prediction based on diffractive parton distribution functions extracted from inclusive ep DIS measurements. Measurement of leading proton provides a unique opportunity to investigate the response of forward detectors for the diffractive events. Using such events, the performance of the large rapidity gap selection is examined.

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