Measurement of the cross section using a soft-pion analysis in two-photon processes

Enomoto, R.; Abe, K.; Abe, Tomohiro; Adachi, I.; Akiyama, Masashi; Awa, S.; Belusević, R.; Emi, K.; Fujii, Hirofumi; Fujii, Keisuke; Fujii, T.; Fujimoto, J.; Fujita, K.; Fujiwara, N.; Hayashii, H.; Howell, B.; Iida, N.; Ikeda, Hirokazu; Itoh, R.; Iwasaki, H.; Iwasaki, M.; Kajikawa, R.; Kaneyuki, K.; Kato, Seiya; Kawabata, S.; Kichimi, H.; Kobayashi, M.; Koltick, D.; Levine, I.; Minami, Shigeo; Miyabayashi, K.; Miyamoto, A.; Muramatsu, K.; Nagai, K.; Nagira, T.; Nakano, E.; Nakabayashi, K.; Nitoh, O.; Noguchi, S.; Ochiai, F.; Ohnishi, Y.; Okuno, Hiroshi; Okusawa, T.; Shimozawa, K.; Shinohara, T.; Sugiyama, A.; Sugiyama, Naoshi; Suzuki, Shingo; Takahashi, K.; Takahashi, T.; Takemoto, M.; Tanimori, T.; Tauchi, T.; Teramae, F.; Teramoto, Y.; Toomi, N.; Toyama, T.; Tsukamoto, T.; Uno, S.; Watanabe, Tsuyoshi; Watanabe, Y.; Yamaguchi, A.; Yamamoto, A.; Yamauchi, M.

doi:10.1016/0370-2693(94)91515-6

Cited by 29 publications

(7 citation statements)

References 47 publications

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“…All of these papers have reported larger cross sections than that based on the lowest-order (LO) two-photon theory [6,7], when the Drees-Grassie parametrization [8] in the resolved-photon processes was taken into account. In our previous reports [2,3,4] we showed that the charm-pair cross sections approximately agreed with theory when we took into account the next-to-leading-order correction (NLO) to the hard interactions [9], the lower charm-quark mass, and the intrinsic gluon P T inside a photon [10], together with the Levy-Abramowicz-Charchula set-1 (LAC1) parametrization [11] for the resolved-photon process. This explanation of excesses, however, must be confirmed by further analysis.…”

Section: Introductionmentioning

confidence: 67%

“…In order to estimate the acceptances and backgrounds in this analysis, we used the following Monte-Carlo simulation programs. Details concerning the event generation of direct as well as resolved-photon and vector meson dominance (VDM) processes can be found in references [1,2,18]. Here, we just note the following points.…”

Section: Monte-carlo Simulationmentioning

confidence: 99%

“…Here, we just note the following points. For cc generation, we used the current charm-quark mass of 1.3 GeV to calculate the cross sections for point-like processes and a constituent charm-quark mass of 1.6 GeV for the hadronization procedure, and made a next-to-leading order (NLO) correction by factorization, the details of which can be found in references [1,2,9]. Light-quark generation was carried out by using the lowest order (LO) formula with a P min T cut of 2.5 GeV.…”

Section: Monte-carlo Simulationmentioning

confidence: 99%

“…Charm pair production in two-photon processes at √ s=58 GeV have been reported in references [1,2,3,4,5]. All of these papers have reported larger cross sections than that based on the lowest-order (LO) two-photon theory [6,7], when the Drees-Grassie parametrization [8] in the resolved-photon processes was taken into account.…”

Section: Introductionmentioning

confidence: 99%

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Observation of excess Λ() production in two-photon processes at TRISTAN

Enomoto¹,

Abe²,

Abe³

et al. 1995

Physics Letters B

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We have carried out inclusive measurements of Λ(Λ) production in two-photon processes at TRIS-TAN. The mean √ s was 58 GeV and the integrated luminosity was 265 pb −1 . Inclusive Λ(Λ) samples were obtained under such conditions as no-electron, anti-electron, and remnant-jet tags. The data were compared with theoretical calculations. The measured cross sections are two-times larger than the leading-order theoretical predictions, suggesting the necessity of next-to-leading-order Monte-Carlo generator. * submitted for publication. † Internet address: enomoto@kekvax.kek.jp.

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Section: Introductionmentioning

confidence: 67%

Section: Monte-carlo Simulationmentioning

confidence: 99%

Section: Monte-carlo Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Observation of excess Λ() production in two-photon processes at TRISTAN

Enomoto¹,

Abe²,

Abe³

et al. 1995

Physics Letters B

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“…The parameters used in this program were fitted for general event shapes [14]. For two-photon processes, we used own event generator of which the details were described in reference [3,15,16].…”

Section: Event Generationmentioning

confidence: 99%

Electron identification using the TOPAZ detector at TRISTAN

Iwasaki¹,

Nakano²,

Enomoto³

1995

Nuclear Instruments and Methods in Physics Research Section A:

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We present an electron-identification method using the time-projection chamber and the lead-glass calorimeter in the TOPAZ detector system. Using this method we have achieved good electron identification against hadron backgrounds over a wide momentum range in the hadronic events produced by both single-photon exchange and two-photon processes. Pion-rejection factors and electron efficiencies were 163 and 68.4\% for high-$P_T$ electrons and 137 and 42.7\% for low-$P_T$ electrons in the single-photon-exchange process, and 8600 and 36.0\% for the two-photon process, respectively.Comment: 32 pages, latex format (article), 24 figures, submitted for publication

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Production of heavy quarks and heavy quarkonia

Schüler

1996

Z. Phys. C - Particles and Fields

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Uncertainties in the next-to-leading-order calculations of heavyquark (Q) production are investigated. Predictions for total cross sections, single-inclusive distributions of heavy quarks and heavy flavoured hadrons, as well as for Q Q correlations, are compared with charm and bottom data.The description of heavy-quarkonium production requires a separation of the short-distance scale of Q Q production, which is set by the heavy-quark mass from the longer-distance scales associated with the bound-state formation. Various factorization approaches are compared, in particular with respect to the different constraints imposed on the colour and angular-momentum states of the Q Q pair(s) within a specific quarkonium state. Theoretical predictions are confronted with data on heavy-quarkonium production at fixed-target experiments and also at pp colliders, where fragmentation gives the leading-twist cross section in 1/p 2 T and 1/m 2 at high transverse momentum.

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Measurement of the cross section using a soft-pion analysis in two-photon processes

Cited by 29 publications

References 47 publications

Observation of excess Λ() production in two-photon processes at TRISTAN

Observation of excess Λ() production in two-photon processes at TRISTAN

Electron identification using the TOPAZ detector at TRISTAN

Production of heavy quarks and heavy quarkonia

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