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1. Upper limits for charm hadron decays to two muons plus hadrons

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Aryal, N.W. Reay, R.A. Sidwell, N.R. Stanton, M. Chikawa, T. Abe, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Komatsu, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, M. Nomura, K. Okada, H. Tajima, T. Toshitou, S. Yoshida, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, K. Reibel, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kusumoto, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Kazuno, T. Koya, E. Niu, S. Ogawa, H. Shibuya, S. Watanabe, N. Yasuda, M. Kamiya, Y. Sato, I. Tezuka, M. Yamaki, S.Y. Bahk, and S.K. Kim

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Spectrometer, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Nuclear Experiment
Abstract

A search for charm hadron decays into two muons plus one or more hadrons has been carried out using a hybrid emulsion spectrometer. This technique is sensitive to modes with missing neutrals, e.g. π0μ+μ− and ϱ±μ+μ−, as well as to constrained modes having visible invariant masses equal to those of charm states. No evidence for any such decays has been found, which allows upper limits at the 90% confidence level as low as 1.8 × 10−4 to be placed on the branching fractions for charm-changing neutral-current and lepton-number violating decay modes.

Published
1995
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2. Measurement of Γ(D0 → K−μ+ν)/Γ(D0→ μ+X using a D tag

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Aryal, N.W. Reay, R.A. Sidwell, N.R. Stanton, M. Chikawa, T. Abe, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, M. Nomura, H. Tajima, S. Yoshida, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, R. Reibel, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kusumoto, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Kazuno, T. Koya, E. Niu, S. Ogawa, H. Shibuya, S. Watanabe, N. Yasuda, M. Kamiya, Y. Sato, I. Tezuka, M. Yamaki, S.Y. Bahk, and S.K. Kim

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Meson, Branching fraction, Hadron, Analytical chemistry, Nuclear emulsion, Decay chain
Abstract

The relative branching fraction RK = Γ(D0 → K−μ+v)/Γ(D0 → μ−X) has been measured by Fermilab experiment E653, using D0 mesons produced by 600 GeV π−. The semimuonic decay sample of 232 events was identified by the decay chain D ∗+ → D 0 π + , D 0 → μ + h − X , where h is a hadron. The Kμv component was extracted from the joint distribution of these events in the D0 decay variables Mmin and pTh. We find RK = 0.472 ± 0.051 (stat) ± 0.040 (sys), and use a world average of the D0 → Klv branching fraction to obtain the D0 inclusive semimuonic branching fraction B(D0 → μ+X) = (7.67 ± 1.13)%.

Published
1994
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3. Observation of D+ → ρ(770)0μ+v

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.C. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, S. Aoki, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Komatsu, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, M. Nomura, K. Okada, H. Tajima, T. Toshitou, S. Yoshida, M. Aryal, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Smow, S.E. Willis, O. Kusumoto, S. Ohashi, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, S. Ikegami, M. Kazuno, T. Koya, E. Niu, S. Ogawa, H. Shibuya, S. Watanabe, N. Yasuda, Y. Sato, M. Seshimo, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Rho meson, Muon, D meson, Analytical chemistry, Elementary particle, lcsh:Physics, lcsh:QC1-999
Abstract

We report the first observation of the Cabibo disfavored semileptonic decay mode D+ → ρ(770)0 μ+v and measure its decay rate relative to the Cabibbo favored mode D + → K ∗ (892) 0 μ + v to be Λ(D + → ρ(770) 0 μ + v Λ(D + → K ∗ (892) 0 μ + v) = 0.044 0.031 −0.025 ( stat. ) ± 0.014 ( syst. ) . The results are compared to theoretical predictions and to previous experimental upper limits.

Published
1993

4. Search for diffractive charm production in 800 GeV/c proton-silicon interactions

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, J.J. Smetanka, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, M. Nomura, H. Tajima, S. Yoshida, M. Aryal, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kusumoto, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Adachi, I. Ikegami, M. Kazuno, E. Niu, H. Shibuya, S. Watanabe, Y. Sato, M. Seshimo, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Silicon, Proton, chemistry.chemical_element, Elementary particle, Dissociation reaction, Nuclear physics, Pair production, chemistry, D meson, Mass spectrum, Charm (quantum number)
Abstract

A search for charm production in the coherent diffractive dissociation reaction pSi→XSi was carried out for the modes D0→K−π+, D0→K−π+π+π−, and D+→K−π+π+. No charm signals were observed, and the 90% confidence level upper limit for coherent charm pair production was determined to be 26 μb per silicon nucleus. The results are interpreted as an upper limit of 0.2% on the amount of intrinsic charm in the proton.

Published
1993
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5. Limits for four- and five-prong semimuonic charm meson decays

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, T. Kozaki, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, M. Nomura, H. Tajima, S. Yoshida, M. Aryal, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kusumoto, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Adachi, I. Ikegami, M. Kazuno, E. Niu, H. Shibuya, S. Watanabe, Y. Sato, M. Seshimo, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Physics, Nuclear and High Energy Physics, Crystallography, Particle physics, Meson, Elementary particle, Charm (quantum number), lcsh:Physics, lcsh:QC1-999
Abstract

Upper limits at the 90% confidence level are presented for four- and five-prong semimuonic decays of charm mesons. From a study of four-prong vertices we find B ( D 0 → K − π + π − μ + ν )/ B ( D 0 → K − μ + ν ) B (D 0 → ( K ∗ (892)π) − μ + ν)/B(D 0 → K − μ + ν) . The five-prong vertices yield the result B ( D S + → η ′ μ + ν ) / B ( D S + → φμ + ν )

Published
1993
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6. A study of the semimuonic decays of the D

Author

K. Kodama, N. ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, M. Nomura, H. Tajima, S. Yoshida, M. Aryal, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kusumoto, S. Ohashi, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Adachi, I. Ikegami, M. Kazuno, E. Niu, H. Shibuya, S. Watanabe, Y. Sato, M. Seshimo, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, Partial width, Analytical chemistry, Form factor (quantum field theory), Elementary particle, Pseudovector, lcsh:Physics, lcsh:QC1-999
Abstract

We present a study of the Cabibbo-allowed semimuonic decay modes of the DS+ produced in 600 GeV c π − -emulsion interactions. From a signal of 18.7±4.9−0.7+0.4 events in the DS+ → oμ+υ channel, the product of production cross section and partial width is measured with respect to that for D + → K ∗0 μ + υ to be ( σ(D S + ) σ(D + )) . (Λ(D S + → oμ + ν)Λ(D + → K ∗0 μ + ν)) = 0.56 ± 0.14 ± 0.12. The form factor ratios in the decay, obtained by fitting to the decay angles and q2, are A 2 (0) 1 (0) = 2.1 −0.5 +0.6 ± 0.2 and V (0) A 1 (0) = 2.3 −0.9 +1.1 ± 0.4 , where A1 (0) and A2 (0) are the axial vector form factors and V(0) is the vector form factor, evaluated at q2 = 0. The first observation of DS+ → (ημ+υ + η'μ+υ) is also reported, and Γ (D S + → (ημ + υ + η'μ + υ)) Γ (D S + → oμ + υ) is determined to be 3.9 ± 1.6.

Published
1993
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7. Measurement of beauty hadron pair production in 600 GeV/c π− emulsion interactions

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, T. Fujii, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Miyanashi, K. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, M. Nomura, H. Tajima, S. Yoshida, M. Aryal, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Olevnik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kusumoto, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Adachi, M. Kazuno, E. Niu, H. Shibuya, S. Watanabe, I. Ohtsuka, Y. Sato, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Pair production, Hadron, Nuclear emulsion, Fermilab, Nucleon
Abstract

We report on the production characteristics and total cross section for 9 beauty hadron pairs produced by a 600 GeV/ c π − beam, the first such information in this energy region. The events were detected in the hybrid emulsion spectrometer of Fermilab Experiment E653. The measured pair cross section for all χ F , assuming linear A dependence, is 33±11 (stat.)±6(syst.) nb/nucleon. Fits of the inclusive single-hadron production distribution to the forms d σ d χ F ∝ (1−|χ F −χ 0 |) n and d σ d p T 2 ∝ exp (−bp t 2 ) give n=5.0 −2.1−1.7 +2.7+1.7 , χ 0 =0.06 −0.07−0.03 +0.06+0.02 , and b=0.13 −0.04−0.02 +0.05+0.02 ( GeV /c −2 . .The pairs tend to be produced back-to-back.

Published
1993
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8. Measurement of the branching ratio for

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, H. Tajima, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kusumoto, T. Okusawa, m. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Adachi, M. Kazuno, E. Niu, H. Shibuya, S. Watanabe, I. Ohtsuka, Y. Sato, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Normalization (statistics), Physics, Nuclear and High Energy Physics, Branching fraction, Analytical chemistry, Nuclear emulsion
Abstract

The branching ratio for the decay mode D + → K ∗0 μ + ν has been measured with two methods. The first uses D0→K−μ+ν for normalization, and yields the result B( D + → K ∗0 μ + ν)=(3.25±0.71±0.75)% . From this method we also obtain the direct measurement Γ( D + → K ∗0 μ + ν)/Γ( D 0 → K − μ + ν)=0.43±0.09±0.09 . The second method uses the mode D+→K−π+π+ for normalization and yields B( D + → K ∗0 μ + ν)=(4.18±0.66±0.96)% . Combining the results of the two methods yields B( D + → K ∗0 μ + ν)=(3.57±0.96)% .

Published
1992
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9. Charm meson production in 600 GeV/c π- emulsion interactions

Author

K. Kodama, N. Ushida, A. Mokhtarami, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, S. Aoki, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Miyanishi, K. Nakamura, M. Nakamura, Y. Nakamura, S. Nakanishi, K. Niu, K. Niwa, H. Tajima, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, O. Kasumoto, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, H. Yuuki, H. Okabe, J. Yokota, M. Adachi, M. Kazuno, E. Niu, H. Shibuya, S. Watanabe, I. Ohtsuka, Y. Sato, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Physics, Nuclear physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Meson production, Meson, Charm (quantum number), Nucleon, Atomic mass
Abstract

We present total and differential cross sections for charm mesons produced in 600 GeV/c π- emulsion interactions. Fits to d2σ/dxF dpT2∞ (1−|xF|)nexp (-bpT2) for 676 electronically reconstructed D mesons with xF>0 give n=4.25±0.24 (stat.)±0.23 (syst.) and b=0.76±0.03±0.03 (GeV/c)-2. The total inclusive D+ and D0 cross sections are σ(π-N→D±; xF>0) = 8.66±0.46±1.96μb nucleon and σ(π - N→D 0 D 0 ; x F >0)=22.05±1.37±4.82μb nucleonk, where a linear dependence on the mean atomic weight of the target is assumed. These results are compared to next-to-leading order QCD predictions.

Published
1992
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10. Measurement of the form factor ratios in the decay

Author

K. Kodama, N. Ushida, A. Mokhtarani, V.S. Paolone, J.T. Volk, J.O. Wilcox, P.M. Yager, R.M. Edelstein, A.P. Freyberger, D.B. Gibaut, R.J. Lipton, W.R. Nichols, D.M. Potter, J.S. Russ, C. Zhang, Y. Zhang, H.I. Jang, J.Y. Kim, T.I. Kim, I.T. Lim, M.Y. Pac, B.R. Baller, R.J. Stefanski, K. Nakazawa, K.S. Chung, S.H. Chung, D.C. Kim, I.G. Park, M.S. Park, J.S. Song, C.S. Yoon, M. Chikawa, T. Abe, S. Aoki, T. Fujii, G. Fujioka, K. Fujiwara, H. Fukushima, T. Hara, Y. Takahashi, K. Taruma, Y. Tsuzuki, C. Yokoyama, S.D. Chang, B.G. Cheon, J.H. Cho, J.S. Kang, C.O. Kim, K.Y. Kim, T.Y. Kim, J.C. Lee, S.B. Lee, G.Y. Lim, S.W. Nam, T.S. Shin, K.S. Sim, J.K. Woo, Y. Isokane, Y. Tsuneoka, A. Gauthier, K. Hoshino, H. Kitamura, M. Kobayashi, M. Miyanishi, K. Nakamura, M. Nakamura, S. Nakanishi, K. Niu, K. Niwa, H. Tajima, J.M. Dunlea, S.G. Frederiksen, S. Kuramata, B.G. Lundberg, G.A. Oleynik, N.W. Reay, K. Reibel, R.A. Sidwell, N.R. Stanton, K. Moriyama, H. Shibata, G.R. Kalbfleisch, P. Skubic, J.M. Snow, S.E. Willis, W.Y. Yuan, O. Kusumoto, T. Okusawa, M. Teranaka, T. Tominaga, T. Yoshida, J. Yuuki, H. Okabe, J. Yokota, M. Adachi, M. Kazuno, E. Niu, H. Shibuya, S. Watanabe, I. Ohtsuka, Y. Sato, I. Tezuka, S.Y. Bahk, and S.K. Kim

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Transverse plane, Angular distribution, Atomic physics, Polarization (waves), Pseudovector
Abstract

A measurement of the form factor ratios in the decay D + → K ∗ (892) 0 μ + ν is obtained by fitting to the decay angles and q2 of 305 events. The results, evaluated at q2 = 0, are A2(0)/A1(0) = 0.82+0.22−0.23 (stat.)±0.11 (sys.) and V(0)/A1(0) = 2.00+0.34−0.32±0.16, where A1 and A2 are the axial vector form factors and V is the vector form factor. The corresponding ratio of the longitudinal to transverse polarization of the K ∗0 is 1.18±0.18±0.08. These results are compared with other experimental results and with theoretical predictions.

Published
1992
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