Near-Threshold Diffractive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ϕ</mml:mi></mml:math>-Meson Photoproduction from the Proton

Mibe, T.; Chang, W. C.; Nakano, Takashi; Ahn, D. S.; Ahn, J. K.; Akimune, H.; Asano, Yoshihiro; Daté, S.; Ejiri, H.; Fujimura, H.; Fujiwara, M̄.; Hicks, K.; Hotta, T.; Imai, K.; Ishikawa, T.; Iwata, T.; Kawai, H.; Kim, Z. Y.; Kino, K.; Kohri, H.; Kumagai, N.; Makino, S.; Matsuda, T.; Matsumura, T.; Matsuoka, N.; Miwa, K.; Miyabe, M.; Miyachi, Y.; Morita, Masato; Muramatsu, N.; Niiyama, M.; Nomachi, M.; Ōhashi, Y.; Ooba, T.; Ohkuma, H.; Oshuev, D. S.; Rangacharyulu, C.; Sakaguchi, A.; Sasaki, T.; Shagin, P.; Shiino, Y.; Shimizu, H.; Sugaya, Y.; Sumihama, M.; Титов, А. И.; Toi, Y.; Toyokawa, H.; Wakai, A.; Wang, C. W.; Wang, S. C.; Yonehara, K.; Yorita, T.; Yoshimura, Masashi; Yosoi, M.; Zegers, R. G. T.

doi:10.1103/physrevlett.95.182001

Cited by 114 publications

(115 citation statements)

References 37 publications

(38 reference statements)

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“…In general, φ-meson production on hydrogen with elementary probes is not completely understood at the energy of our experiment [37,38], and this should certainly be improved. It might be interesting to note in this context that strangeness production in closely related channels might have some influence here [39][40][41].…”

Section: Discussionmentioning

confidence: 99%

Momentum dependence of theφ-meson nuclear transparency

Hartmann¹,

Kiselev²,

Polyanskiy³

et al. 2012

Phys. Rev. C

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The production of φ mesons in proton collisions with C, Cu, Ag, and Au targets has been studied via the φ → K + K − decay at an incident beam energy of 2.83 GeV using the ANKE detector system at COSY. For the first time, the momentum dependence of the nuclear transparency ratio, the in-medium φ width, and the differential cross section for φ-meson production at forward angles have been determined for these targets over the momentum range of 0.6-1.6 GeV/c. There are indications of a significant momentum dependence in the value of the extracted φ width, which corresponds to an effective φN absorption cross section in the range of 14-21 mb.

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Section: Discussionmentioning

confidence: 99%

Momentum dependence of theφ-meson nuclear transparency

Hartmann¹,

Kiselev²,

Polyanskiy³

et al. 2012

Phys. Rev. C

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“…Hadrons with strange quarks are produced by photo-production. The LEPS experiment has reported various interesting data whereas the detection area was limited to forward angle [1,2]. The new LEPS2 detectors will cover almost 4π solid angle.…”

Section: Introductionmentioning

confidence: 99%

High time resolution RPCs with different readout geometries

et al. 2012

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We have developed prototype resistive plate chambers (RPCs) for the LEPS2 experiment at SPring-8 in Japan. At LEPS2, RPCs will be used as time-of-flight detectors. The goal is to achieve a time resolution of 50 ps with a readout cell as large as possible. We made several types of RPCs and examined the dependence of time resolution with the size and the shape of the readout cell. We found that the time resolution and the efficiency largely depend on the shape of the readout cell and the position where it is excited. We confirmed that two-ends strip-shaped readout cells performed better than one-end readout cells, and a promising time resolution of 60 ps was obtained with a 2.5 cm (wide) × 108 cm (long) readout.

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“…Other processes, such as nucleon exchange [3,4], nucleon resonances [5,6], second Pomeron exchange, t-channel scalar meson and glueball exchanges [6,7], and ss-cluster knockout [4,8,9], have also been investigated. However, a peak in the differential cross sections of φ photoproduction on protons at forward angles around E γ ∼ 2.0 GeV as recently observed by the LEPS collaboration [10] cannot be explained by the processes mentioned above.…”

Section: Introductionmentioning

confidence: 82%

Analysis of the near-threshold peak structure in the differential cross section ofφ-meson photoproduction: Indication of a missing resonance with non-negligible strangeness content

Kiswandhi

Yang

2012

Phys. Rev. C

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The details of the analysis of the near-threshold bump structure in the forward differential cross section of the φ-meson photoproduction to determine whether it is a signature of a resonance, together with more extensive results, are presented. The analysis is carried out in an effective Lagrangian approach which includes Pomeron and (π, η) exchanges in the t channel and contributions from the sand u-channel excitations of a postulated nucleon resonance. In addition to the differential cross sections, we use the nine spin-density matrix elements as recently measured, instead of the φ-meson decay angular distributions which depend only on six spin-density matrix elements as was done before, to constrain the resonance parameters. We conclude that indeed the nonmonotonic behavior, along with the other experimental data as reported by LEPS, can only be explained with an assumption of the excitation of a resonance of spin 3/2, as previously reported. However, both parities of (±) can account for the data equally well with almost identical mass of 2.08 ± 0.04 GeV and width of 0.501 ± 0.117 and 0.570 ± 0.159 for 3/2 + and 3/2 − , respectively. The ratio of the helicity amplitudes A 1/2 /A 3/2 calculated from the resulting coupling constants differs in sign from that of the known D 13 (2080). More experimental data on single and double polarization observables are needed to resolve the parity. We further find that with an assumption of large values of the OZI-evading parameters x OZI = 12 for J P = 3/2 − and x OZI = 9 for J P = 3/2 + , the discrepancy between the recent experimental data on ω-meson photoproduction and the theoretical model can be considerably reduced. We argue that the large value of x OZI indicates that the postulated resonance contains a non-negligible amount of strangeness content.

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Near-Threshold Diffractiveϕ-Meson Photoproduction from the Proton

Cited by 114 publications

References 37 publications

Momentum dependence of theφ-meson nuclear transparency

Momentum dependence of theφ-meson nuclear transparency

High time resolution RPCs with different readout geometries

Analysis of the near-threshold peak structure in the differential cross section ofφ-meson photoproduction: Indication of a missing resonance with non-negligible strangeness content

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