K. Abe, K. Abe, R. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, W. Bartel, A. Bay, P. K. Behera, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, M. Danilov, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, A. Garmash, 10 T. Gershon, A. Gordon, R. Guo, F. Handa, T. Hara, Y. Harada, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S. R. Hou, W.-S. Hou, H.-C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, 36 G. Leder, S. H. Lee, J. Li, D. Liventsev, R.-S. Lu, J. MacNaughton, G. Majumder, F. Mandl, S. Matsumoto, T. Matsumoto, 47 H. Miyake, H. Miyata, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, L. S. Peak, J.-P. Perroud, M. Peters, L. E. Piilonen, N. Root, H. Sagawa, S. Saitoh, Y. Sakai, M. Satapathy, A. Satpathy, 5 O. Schneider, S. Schrenk, C. Schwanda, 13 S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, V. Sidorov, J. B. Singh, S. Stanič, ∗ M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, 47 K. Suzuki, S. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, S. N. Tovey, W. Trischuk, † T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, J. Yashima, Y. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, and D. Žontar

S. H. Lee, K. Suzuki, K. Abe, K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, K. Akai, M. Akatsu, M. Akemoto, Y. Asano, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, S. Banerjee, A. Bay, I. Bedny, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, P. Chang, Y. Chao, K.-F. Chen, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, A. Chuvikov, M. Danilov, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, J. Flanagan, C. Fukunaga, K. Furukawa, N. Gabyshev, A. Garmash, 7 T. Gershon, B. Golob, 12 R. Guo, J. Haba, C. Hagner, F. Handa, N. C. Hastings, H. Hayashii, M. Hazumi, I. Higuchi, T. Hokuue, Y. Hoshi, W.-S. Hou, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, M. Iwasaki, Y. Iwasaki, H. Kakuno, J. H. Kang, J. S. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, H. Kawai, T. Kawasaki, H. Kichimi, E. Kikutani, H. J. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, H. Koiso, S. Korpar, P. Križan, 12 P. Krokovny, R. Kulasiri, A. Kuzmin, Y.-J. Kwon, J. S. Lange, 33 G. Leder, T. Lesiak, J. Li, A. Limosani, S.-W. Lin, D. Liventsev, J. MacNaughton, F. Mandl, D. Marlow, M. Masuzawa, T. Matsumoto, A. Matyja, S. Michizono, T. Mimashi, W. Mitaroff, H. Miyake, H. Miyata, D. Mohapatra, G. R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, T. T. Nakamura, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, Y. Ogawa, K. Ohmi, Y. Ohnishi, T. Ohshima, N. Ohuchi, K. Oide, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, C. W. Park, H. Park, K. S. Park, N. Parslow, L. S. Peak, M. Peters, L. E. Piilonen, N. Root, H. Sagawa, S. Saitoh, Y. Sakai, T. R. Sarangi, M. Satapathy, A. Satpathy, 3 O. Schneider, J. Schümann, C. Schwanda, 10 A. J. Schwartz, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, T. Shidara, B. Shwartz, V. Sidorov, J. B. Singh, N. Soni, S. Stanič, ∗ M. Starič, R. Sugahara, A. Sugi, K. Sumisawa, T. Sumiyoshi, S. Suzuki, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, M. Tawada, G. N. Taylor, Y. Teramoto, T. Tomura, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, Y. Unno, S. Uno, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, Heyoung Yang, M. Yoshida, Y. Yusa, S. L. Zang, J. Zhang, Z. P. Zhang, Y. Zheng, V. Zhilich, D. Žontar, 12 and D. Zürcher

The decay phi --> eta'gamma has been observed by the CMD-2 detector at the e(+)e(-) collider VEPP-2M at Novosibirsk. Of 5.5 million produced phi's, six events of the phi --> eta'gamma decay were selected with the expected background less than one event. The corresponding branching ratio is B(phi --> eta'gamma) = 1.2(-0.5)(+0.7).10(-4). It is the first observation of this radiative decay. (C) 1997 Published by Elsevier Science B.V.

We report a search for the flavor-changing neutral current decay B → K(∗)l+l− using a 29.1 fb−1 data sample accumulated at the Υ(4S) resonance with the Belle detector at the KEKB e+e− storage ring. The decay process B → Kμ+μ− is observed, for the first time, with a branching fraction of B(B → Kμ+μ−) = (0.99 −0.32 −0.14)×10. In addition, we set 90% confidence level upper limits B(B → Ke+e−) < 1.3×10−6, B(B → K∗e+e−) < 5.6×10−6 and B(B → K∗μ+μ−) < 3.1 × 10−6. PACS numbers: 11.30.Hv, 13.20.He, 13.25.Hw Typeset using REVTEX

We report a determination of the B d-B̄ 0 d mixing parameter ∆md based on the time evolution of dilepton yields in Υ(4S) decays. The measurement is based on a 5.9 fb−1 data sample collected by the Belle detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing ∆md as a free parameter. Using both muons and electrons, we obtain ∆md = 0.463 ± 0.008 (stat.)± 0.016 (sys.) ps−1. This is the first determination of ∆md from time evolution measurements at the Υ(4S). We also place limits on possible

We present measurements of time-dependent CP asymmetries in B0 → φ(1020)K0, η′K0, K0 SK 0 SK 0 S , K 0 Sπ 0, f0(980)K 0 S , ω(782)K 0 S and K +K−K0 S decays based on a sample of 386×10 6 BB pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e− collider. These decays are dominated by the b→ s gluonic penguin transition and are sensitive to new CP -violating phases from physics beyond the standard model. One neutral B meson is fully reconstructed in one of the specified decay channels, and the flavor of the accompanying B meson is identified from its decay products. CP -violation parameters sin 2φeff 1 and Af for each of the decay modes are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays. We also perform an improved measurement of CP asymmetries in B0 → J/ψK0 decays using the same data sample. The same analysis procedure mentioned above yields sin 2φ1 = +0.652± 0.039(stat) ± 0.020(syst), which serves as a reference point for the standard model, and Af = +0.010 ± 0.026(stat) ± 0.036(syst). PACS numbers: 11.30.Er, 12.15.Hh, 13.25.Hw

We report a search for the flavor-changing neutral current decay B → Xsl +l− using a 29.5 fb−1 data sample accumulated at the Υ(4S) resonance with Belle detector at the KEKB e+e− storage ring. We observe evidence for B → Kμ+μ− and report the preliminary branching fraction of B(B → Kμ+μ−) = (0.99 −0.32 +0.13 −0.15) × 10−6. We also set the following 90% confidence level upper limits on the branching fractions for exclusive and inclusive decays, B(B → Ke+e−) < 1.2 × 10−6, B(B → K∗(892)e+e−) < 5.1 × 10−6, B(B → K∗(892)μ+μ−) < 3.0 × 10−6, B(B → Xsee) < 10.1 × 10−6, B(B → Xsμμ) < 19.1 × 10−6. Typeset using REVTEX

We report measurements of the branching fractions for B0 → π+π−, K+π−, K+K− and K0π0, and B+ → π+π0, K+π0, K0π+ and K+K0. The results are based on 10.4 fb−1 of data collected on the Υ(4S) resonance at the KEKB e+e− storage ring with the Belle detector, equipped with a high momentum particle identification system for clear separation of charged π and K mesons. We find B(B0 → π+π−) = (0.56 +0.23 −0.20 ± 0.04) × 10−5, B(B0 → K+π−) = (1.93 +0.34 +0.15 −0.32 −0.06) × 10−5, B(B+ → K+π0) = (1.63 +0.35 +0.16 −0.33 −0.18) × 10−5, B(B+ → K0π+) = (1.37 +0.57 +0.19 −0.48 −0.18) × 10−5, and B(B0 → K0π0) = (1.60 +0.72 +0.25 −0.59 −0.27)× 10−5, where the first and second errors are statistical and systematic. We also set upper limits of B(B+ → π+π0) < 1.34 × 10−5, B(B0 → K+K−) < 0.27 × 10−5, and B(B+ → K+K0) < 0.50 × 10−5 at the 90% confidence level. PACS numbers: 13.25.Hw, 14.40.Nd

We present a measurement of the pion form factor based on e(+)e(-) annihilation data from the CMD-2 detector in the energy range 0.6 < root s < 1.0 GeV with a systematic uncertainty of 0.9%. A data sample is five times larger than that used in our previous measurement. (c) 2007 Elsevier B.V. All rights reserved.

The CMD-2 cryogenic magnetic detector used in a set of experiments on the VEPP-2M electron-positron collider at energies as great as 1.4 GeV is described. The design of the detector subsystems and the algorithms for reconstructing tracks in the drift chamber and the CsI and BGO calorimeters are presented. The spatial and energy resolutions of the detector systems have been determined from analysis of experimental data. The design of the superconducting solenoid and the layout of its powering by means of a superconducting transformer are shown. The trigger system of the detector and the conditions for recording “charged” and “neutral” events on a magnetic tape are described. The procedure used to monitor the parameters of the detector systems during the experiment is presented.

We present a measurement of the pion form factor based on ee annihilation data from the CMD-2 detector, in the energy range 0.6 <

The results of the experiment on the measurement of the e + e − → π + π − cross section in a cm energy range of 370–520 MeV are presented. The systematic measurement error is equal to 0.7%. In the vector dominance model, the pion electromagnetic radius is calculated using all the CMD-2 data on the pion form factor. The cross section for the production of a muon pair is measured in the energy range of the experiment.

The cross section of the process e+e−→π+π−π0 has been measured in the c.m. energy range 984–1060 MeV with the CMD-2 detector at the VEPP-2M collider. The obtained value of Br(ϕ→e+e−)Br(ϕ→π+π−π0)=(4.51±0.16±0.11)×10−5 is in good agreement with the previous measurements and has the best accuracy. Analysis of the Dalitz plot was performed. The contributions of the dominant ϕ→ρπ mechanism as well as of a small direct ϕ→3π amplitude were determined.

We have searched for tau lepton decays, tau(-) -> Lambda($) over bar pi(-) and tau -> Lambda pi(-), that simultaneously violate the conservation of the lepton (L) and baryon (B) number using a data sample of 154 fb(-1) collected with the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider. No evidence for a signal was found in either of the decay modes and we set the following upper limits for the branching fractions: B(tau(-) -> Lambda($) over bar pi(-)) < 1.4 x 10(-7) and B(tau(-) -> Lambda($) over bar pi(-)) < 0.72 x 10(-7) at the 90% confidence level. This is the first search ever performed for these modes. (c) 2005 Elsevier B.V. All rights reserved.