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1. Risk Factors and Prognosis in Patients with COVID-19 and Liver Injury: A Retrospective Analysis

Author

Shen JX, Zhuang ZH, Zhang QX, Huang JF, Chen GP, Fang YY, and Cheng AG

Subjects
covid-19, liver injury, risk factors, prognosis, Medicine (General), R5-920
Abstract

Jia-Xin Shen,1 Ze-Hao Zhuang,1 Qiao-Xian Zhang,2 Jiao-Feng Huang,3 Gong-Ping Chen,4 Ying-Ying Fang,5 Ai-Guo Cheng6 1Endoscopy Center, First Affiliated Hospital of Fujian Medical University, Fuzhou, People’s Republic of China; 2Nursing Department, First Affiliated Hospital of Fujian Medical University, Fuzhou, People’s Republic of China; 3Department of Liver Research Center, First Affiliated Hospital of Fujian Medical University, Fuzhou, People’s Republic of China; 4Department of Pulmonary and Critical Care Medicine, First Affiliated Hospital of Fujian Medical University, Fuzhou, People’s Republic of China; 5Department of Tuberculosis, Third People’s Hospital of Yichang, Yichang, People’s Republic of China; 6Department of Critical Care, Third People’s Hospital of Yichang, Yichang, People’s Republic of ChinaCorrespondence: Ze-Hao ZhuangEndoscopy Center, First Affiliated Hospital of Fujian Medical University, 20, Chazhong Road, Taijiang District, Fuzhou, 350005, Fujian Province, People’s Republic of ChinaTel +86-131-7803-2412Fax +89-59187981370Email zhuang203@yeah.netPurpose: COVID-19 is a new infectious disease with global spread. The aim of the present study was to explore possible risk factors and evaluate prognosis in COVID-19 with liver injury.Methods: A retrospective study was conducted on 356 COVID-19 patients in the Third People’s Hospital of Yichang, Hubei, China. Clinical characteristics and laboratory tests between patients with and without liver injury were compared, while risk factors of COVID-19–related liver injury were analyzed. Univariate and multivariate Cox regression analyses were conducted to identify risk factors of in-hospital death.Results: Of the patients with liver injury, severe and critical types of COVID-19 comprised 12.43% and 14.69%, respectively, higher than in patients without liver injury (both P< 0.05). CRP and male sex were independent risk factors for for patients with liver injury, while decreased lymphocyte count (HR 0.024, 95% CI 0.001– 0.821) and elevated monocytes (HR 1.951, 95% CI 1.040– 3.662) and CRP (HR 1.028, 95% CI 1.010– 1.045) were independent risk factors of prognosis of death in COVID-19 patients with liver injury.Conclusion: Liver injury is a common complication in severe COVID-19 patients. Male sex and elevated CRP were independent risk factors in COVID-19 complicated by liver damage. Liver damage with increased CRP and monocyte count and decreased lymphocyte count may imply a poor prognosis.Keywords: COVID-19, liver injury, risk factors, prognosis

Published
2021

2. The BaBar detector: Upgrades, operation and performance

Author

Aubert, B, Barate, R, Boutigny, D, Couderc, F, del Amo Sanchez, P, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Poireau, V, Prudent, X, Robbe, P, Tisserand, V, Zghiche, A, Grauges, E, Tico, J Garra, Lopez, L, Martinelli, M, Palano, A, Pappagallo, M, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Sun, L, Abrams, GS, Battaglia, M, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Charles, E, Clark, AR, Day, CT, Furman, M, Gill, MS, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, JA, Kerth, LT, Kolomensky, Yu G, Kral, JF, Kukartsev, G, LeClerc, C, Levi, ME, Lynch, G, Merchant, AM, Mir, LM, Oddone, PJ, Orimoto, TJ, Osipenkov, IL, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Suzuki, A, Tackmann, K, Tanabe, T, Wenzel, WA, Zisman, M, Barrett, M, Bright-Thomas, PG, Ford, KE, Harrison, TJ, Hart, AJ, Hawkes, CM, Knowles, DJ, Morgan, SE, O'Neale, SW, Penny, RC, Smith, D, Soni, N, Watson, AT, Watson, NK, Goetzen, K, Held, T, Koch, H, Kunze, M, Lewandowski, B, Pelizaeus, M, Peters, K, Schmuecker, H, Schroeder, T, Steinke, M, Fella, A, Antonioli, E, Boyd, JT, Chevalier, N, Cottingham, WN, Foster, B, Mackay, C, and Walker, D

Subjects
General-purpose detector for colliding beams, Operational experience, High-luminosity storage ring operation, Ream monitoring, physics.ins-det, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics
Abstract

The BaBar detector operated successfully at the PEP-II asymmetric e +e- collider at the SLAC National Accelerator Laboratory from 1999 to 2008. This report covers upgrades, operation, and performance of the collider and the detector systems, as well as the trigger, online and offline computing, and aspects of event reconstruction since the beginning of data taking. © 2013 Elsevier B.V.

Published
2013

3. Search for rare and forbidden decays D+ --> h+/- e+/- e+.

Author

He, Q, Muramatsu, H, Park, CS, Thorndike, EH, Coan, TE, Gao, YS, Liu, F, Artuso, M, Boulahouache, C, Blusk, S, Butt, J, Dorjkhaidav, O, Li, J, Menaa, N, Mountain, R, Nandakumar, R, Randrianarivony, K, Redjimi, R, Sia, R, Skwarnicki, T, Stone, S, Wang, JC, Zhang, K, Csorna, SE, Bonvicini, G, Cinabro, D, Dubrovin, M, Briere, RA, Chen, GP, Chen, J, Ferguson, T, Tatishvili, G, Vogel, H, Watkins, ME, Rosner, JL, Adam, NE, Alexander, JP, Berkelman, K, Cassel, DG, Crede, V, Duboscq, JE, Ecklund, KM, Ehrlich, R, Fields, L, Galik, RS, Gibbons, L, Gittelman, B, Gray, R, Gray, SW, Hartill, DL, Heltsley, BK, Hertz, D, Jones, CD, Kandaswamy, J, Kreinick, DL, Kuznetsov, VE, Mahlke-Krüger, H, Meyer, TO, Onyisi, PUE, Patterson, JR, Peterson, D, Phillips, EA, Pivarski, J, Riley, D, Ryd, A, Sadoff, AJ, Schwarthoff, H, Shi, X, Shepherd, MR, Stroiney, S, Sun, WM, Urner, D, Wilksen, T, Weaver, KM, Weinberger, M, Athar, SB, Avery, P, Breva-Newell, L, Patel, R, Potlia, V, Stoeck, H, Yelton, J, Rubin, P, Cawlfield, C, Eisenstein, BI, Gollin, GD, Karliner, I, Kim, D, Lowrey, N, Naik, P, Sedlack, C, Selen, M, White, EJ, Williams, J, Wiss, J, Asner, DM, Edwards, KW, Besson, D, Pedlar, TK, and Cronin-Hennessy, D

Subjects
CLEO Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

Using 0.8 x 10(6) D+ D- pairs collected with the CLEO-c detector at the psi(3770) resonance, we have searched for flavor-changing neutral current and lepton-number-violating decays of D+ mesons to final states with dielectrons. We find no indication of either, obtaining 90% confidence level upper limits of B(D+ --> pi+ e+ e-) < 7.4 x 10(-6), B(D+ --> pi- e+ d+) < 3.6 x 10(-6), B(D+ --> K+ e+ e-) < 6.2 x 10(-6), and B(D+ --> K- e+ e+) < 4.5 x 10(-6).

Published
2005

4. Radiative decay of the ψ(2S) into two pseudoscalar mesons

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, AD, Chen, GP, Chen, HF, Chen, HS, Chen, J, Chen, JC, Chen, XD, Chen, Y, Chen, YB, Cheng, BS, Choi, JB, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Guo, YN, Guo, ZJ, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Huang, GS, Huang, XP, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Kang, JS, Ke, ZJ, Kelsey, MH, Kim, BK, Kim, HJ, Kim, SK, Kim, TY, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, W, Li, WG, Li, XH, Li, XN, Li, XQ, Li, ZC, Liu, B, Liu, F, Liu, Feng, Liu, HM, Liu, J, Liu, JP, Liu, RG, Liu, Y, Liu, ZX, Lou, XC, Lowery, B, Lu, GR, Lu, F, Lu, JG, Luo, XL, C., E, M., J, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Mo, XH, Nie, J, Olsen, SL, Oyang, J, and Paluselli, D

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Radiative decays of the radially excited charmonium resonance, (Formula presented) into (Formula presented) (Formula presented) and (Formula presented) final states have been measured in a sample of (Formula presented) (Formula presented) events collected by the BES Collaboration. The branching ratios (Formula presented) and (Formula presented) are obtained. When compared to the corresponding radiative (Formula presented) decays, the observed (Formula presented) radiative decay rates into (Formula presented) and (Formula presented) are consistent with the prediction of the “12%” rule. © 2003 The American Physical Society.

Published
2003

5. Radiative decay of the [Formula Presented] into two pseudoscalar mesons

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, AD, Chen, GP, Chen, HF, Chen, HS, Chen, J, Chen, JC, Chen, XD, Chen, Y, Chen, YB, Cheng, BS, Choi, JB, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Guo, YN, Guo, ZJ, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Huang, GS, Huang, XP, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Kang, JS, Ke, ZJ, Kelsey, MH, Kim, BK, Kim, HJ, Kim, SK, Kim, TY, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, W, Li, WG, Li, XH, Li, XN, Li, XQ, Li, ZC, Liu, B, Liu, F, Liu, HM, Liu, J, Liu, JP, Liu, RG, Liu, Y, Liu, ZX, Lou, XC, Lowery, B, Lu, GR, Lu, F, Lu, JG, Luo, XL, Ma, EC, Ma, JM, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Mo, XH, Nie, J, Olsen, SL, Oyang, J, and Paluselli, D

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Radiative decays of the radially excited charmonium resonance, (Formula presented) into (Formula presented) (Formula presented) and (Formula presented) final states have been measured in a sample of (Formula presented) (Formula presented) events collected by the BES Collaboration. The branching ratios (Formula presented) and (Formula presented) are obtained. When compared to the corresponding radiative (Formula presented) decays, the observed (Formula presented) radiative decay rates into (Formula presented) and (Formula presented) are consistent with the prediction of the “12%” rule. © 2003 The American Physical Society.

Published
2003

6. Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the γ (4S)

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, YI, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, and MacFarlane, DB

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e +e - collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb -1 recorded at the γ(4S) resonance and 3.9 fb -1 off resonance. One of the neutral B mesons, which are produced in pairs at the γ(4S), is fully reconstructed in the CP decay modes J/ ψK S0, ψ(2S)K S0, χ c1K S0, J/ψK* 0 (K* 0→K S0π 0) and J/ψK L0, or in flavor-eigenstate modes involving D (*)π/p/a 1 and J/ψK* 0 (K* 0→K +π -). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural netsvork tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B 0-B̄ 0 oscillation frequency Δm d are measured with a sample of about 6350 fully-reconstructed B 0 decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δm d=0.516±0.016(stat)±0.010(syst) ps -1. The value of the asymmetry amplitude sin 2β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B 0 decays in the CP-eigenstate modes. We find sin 2β=0.59 ±0.14(stat)±0. 05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0. 93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation. © 2002 The American Physical Society.

Published
2002

7. Measurement of branching fractions for exclusive B decays to charmonium final states

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, A, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Kirk, A, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, and Salnikov, AA

Subjects
hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We report branching fraction measurements for exclusive decays of charged and neutral B mesons into two-body final states containing a charmonium meson. We use a sample of 22.72±0.36 million BB̄ events collected between October 1999 and October 2000 with the BABAR detector at the PEP-II storage rings at the Stanford Linear Accelerator Center. The charmonium mesons considered here are J/Ψ, Ψ(2S), and Χ c1and the light meson in the decay is either a K, K*, or π 0. © 2002 The American Physical Society.

Published
2002

8. Erratum: Measurement of the B0 lifetime with partially reconstructed B0 → D*- ℓ+ vℓ decays (Phys. Rev. Lett. (2002) 89 (011802))

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Zghiche, A, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, YI, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, and MacFarlane, DB

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Published
2002

9. Measurement of the Branching Fraction and CP Content for the Decay B0→D*+D*-

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Zghiche, A, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O’Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
Clinical Research, BABAR, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We report a measurement of the branching fraction of the decay B0-->D(*+)D(*-) and of the CP-odd component of its final state using the BABAR detector. With data corresponding to an integrated luminosity of 20.4 fb (-1) collected at the Upsilon(4S) resonance during 1999-2000, we have reconstructed 38 candidate signal events in the mode B0-->D(*+)D(*-) with an estimated background of 6.2+/-0.5 events. From these events, we determine the branching fraction to be B(B0-->D(*+)D(*-))=[8.3+/-1.6(stat)+/-1.2(syst)]x10(-4). The measured CP-odd fraction of the final state is 0.22+/-0.18(stat)+/-0.03(syst).

Published
2002

10. Study of time-dependent CP-violating asymmetries and flavor oscillations in neutral B decays at the Υ(4S)

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O’Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We present a measurement of time-dependent CP-violating asymmetries in neutral B meson decays collected with the BABAR detector at the PEP-II asymmetric-energy e + e - collider at the Stanford Linear Accelerator Center. The data sample consists of 29.7 fb -1 recorded at the Υ(4S) resonance and 3.9 fb -1 off resonance. One of the neutral B mesons, which are produced in pairs at the Υ(4S), is fully reconstructed in the CP decay modes J/ΨK S 0 , Ψ(2S)K S 0 , X c1 K S 0 , J/ΨK* 0 (K* 0 →K s 0 π 0 ) and J/ΨK L 0 , or in flavor-eigenstate modes involving D(*)π/ρ/a 1 and J/ΨK* 0 (K* 0 →K + π - ). The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The proper time elapsed between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities, the time-difference resolution function, and the B 0 -B̄ 0 oscillation frequency Δm d are measured with a sample of about 6350 fully-reconstructed B 0 decays in hadronic flavor-eigenstate modes. A maximum-likelihood fit to this flavor eigenstate sample finds Δm d =0.516±0.016(stat)±0.010(syst) ps -1 . The value of the asymmetry amplitude sin 2Β is determined from a simultaneous maximum-likelihood fit to the time-difference distribution of the flavor-eigenstate sample and about 642 tagged B 0 decays in the CP-eigenstate modes. We find sin 2Β=0.59 ±0.14(stat)±0.05(syst), demonstrating that CP violation exists in the neutral B meson system. We also determine the value of the CP violation parameter |λ|=0.93±0.09(stat)±0.03(syst), which is consistent with the expectation of |λ|=1 for no direct CP violation.

Published
2002

11. Measurement of the B0 Lifetime with Partially Reconstructed B0→D*-ℓ+νℓ Decays

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Zghiche, A, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, and MacFarlane, DB

Subjects
BABAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The B(0) lifetime was measured with a sample of 23 million BB pairs collected by the BABAR detector at the PEP-II e(+)e(-) storage ring during 1999 and 2000. Events from the semileptonic decay B(0)-->D(*-)l(+)nu(l) have been selected with a partial reconstruction method in which only the charged lepton and the slow pi from the D*--->D(0)pi(-) decay are reconstructed. The result is tau(B(0)) = 1.529+/-0.012(stat)+/-0.029(syst) ps.

Published
2002

12. Measurement of the B(0) lifetime with partially reconstructed B(0)-->D(-)l(+)nu(l) decays.

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Zghiche, A, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, and MacFarlane, DB

Subjects
BABAR Collaboration, hep-ex, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

The B(0) lifetime was measured with a sample of 23 million BB pairs collected by the BABAR detector at the PEP-II e(+)e(-) storage ring during 1999 and 2000. Events from the semileptonic decay B(0)-->D(*-)l(+)nu(l) have been selected with a partial reconstruction method in which only the charged lepton and the slow pi from the D*--->D(0)pi(-) decay are reconstructed. The result is tau(B(0)) = 1.529+/-0.012(stat)+/-0.029(syst) ps.

Published
2002

13. Search for the Rare Decays B→Kl+l- and B→K*l+l-

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
BABAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We present results from a search for the flavor-changing neutral current decays B-->Kl(+)l(-) and B-->K(*)l(+)l(-), where l(+)l(-) is either an e(+)e(-) or mu(+)mu(-) pair. The data sample comprises 22.7 x 10(6) Upsilon(4S)-->B(-)B decays collected with the BABAR detector at the PEP-II B Factory. We obtain the 90% C.L. upper limits B(B-->Kl(+)l(-))K(*)l(+)l(-))Ke+/-mu(-/+) and B-->K(*)e(+/-)mu(-/+).

Published
2002

14. Search for T and CP Violation in B0-B¯0 Mixing with Inclusive Dilepton Events

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Zghiche, A, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We report the results of a search for T and CP violation in B0-B-0 mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between l+l+ and l-l- events allows us to compare the probabilities for B-0-->B0 and B0-->B-0 oscillations and thus probe T and CP invariance. Using a sample of 23 x 10(6) BB- pairs, we measure a same-sign dilepton asymmetry of A(T/CP) = [0.5+/-1.2(stat)+/-1.4(syst)]%. For the modulus of the ratio of complex mixing parameters p and q, we obtain q/p = 0.998+/-0.006(stat)+/-0.007(syst).

Published
2002

15. Measurement of B0-B¯ 0 Flavor Oscillations in Hadronic B0 Decays

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

Flavor oscillations of neutral B mesons have been studied in e+e- annihilation data collected with the BABAR detector at center-of-mass energies near the upsilon(4S) resonance. The data sample used for this purpose consists of events in which one B0 meson is reconstructed in a hadronic decay mode, while the flavor of the recoiling B0 is determined with a tagging algorithm that exploits the correlation between the flavor of the heavy quark and the charges of its decay products. From the time development of the observed mixed and unmixed final states, we determine the B0-B-0 oscillation frequency deltamd to be 0.516+/-0.016(stat)+/-0.010(syst) ps-1.

Published
2002

16. Measurement of the B0-B¯ 0 Oscillation Frequency with Inclusive Dilepton Events

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, and MacFarlane, DB

Subjects
hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The B0-B-0 oscillation frequency has been measured with a sample of 23 x 10(6) BB- pairs collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we select events in which both B mesons decay semileptonically and use the charge of the leptons to identify the flavor of each B meson. A simultaneous fit to the decay time difference distributions for opposite- and same-sign dilepton events gives deltamd = 0.493+/-0.012(stat)+/-0.009(syst) ps-1.

Published
2002

17. Search for the rare decays B-->Kl(+)l(-) and B-->K(*)l(+)l(-).

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
BABAR Collaboration, hep-ex, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We present results from a search for the flavor-changing neutral current decays B-->Kl(+)l(-) and B-->K(*)l(+)l(-), where l(+)l(-) is either an e(+)e(-) or mu(+)mu(-) pair. The data sample comprises 22.7 x 10(6) Upsilon(4S)-->B(-)B decays collected with the BABAR detector at the PEP-II B Factory. We obtain the 90% C.L. upper limits B(B-->Kl(+)l(-))K(*)l(+)l(-))Ke+/-mu(-/+) and B-->K(*)e(+/-)mu(-/+).

Published
2002

18. Search for T and CP violation in B0-B-0 mixing with inclusive dilepton events.

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Zghiche, A, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
hep-ex, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We report the results of a search for T and CP violation in B0-B-0 mixing using an inclusive dilepton sample collected by the BABAR experiment at the PEP-II B Factory. The asymmetry between l+l+ and l-l- events allows us to compare the probabilities for B-0-->B0 and B0-->B-0 oscillations and thus probe T and CP invariance. Using a sample of 23 x 10(6) BB- pairs, we measure a same-sign dilepton asymmetry of A(T/CP) = [0.5+/-1.2(stat)+/-1.4(syst)]%. For the modulus of the ratio of complex mixing parameters p and q, we obtain q/p = 0.998+/-0.006(stat)+/-0.007(syst).

Published
2002

19. Measurement of Ds+ and Ds*+ production in B meson decays and from continuum e+e- annihilation at s=10.6 GeV

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O’Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Dyce, N, Foster, B, Mackay, C, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Lankford, AJ, Mandelkern, M, McMahon, S, and Stoker, DP

Subjects
Down Syndrome, Brain Disorders, Intellectual and Developmental Disabilities (IDD), hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

New measurements of (Formula presented) and (Formula presented) meson production rates from B decays and from (Formula presented) continuum events near the (Formula presented) resonance are presented. Using 20.8 (Formula presented) of data on the (Formula presented) resonance and 2.6 (Formula presented) off-resonance, we find the inclusive branching fractions (Formula presented) and (Formula presented) where the first error is statistical, the second is systematic, and t he third is due to the (Formula presented) branching fraction uncertainty. The production cross sections (Formula presented) and (Formula presented) are measured at center-of-mass energies about 40 MeV below the (Formula presented) mass. The branching fractions (Formula presented) and (Formula presented) are determined from the (Formula presented) momentum spectra. The mass difference (Formula presented) is also measured. © 2002 The American Physical Society.

Published
2002

20. Study of B±→J/ψπ± and B±→J/ψK± decays: Measurement of the ratio of branching fractions and search for direct CP-violating charge asymmetries

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O’Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We have studied the (Formula presented) and (Formula presented) decays using a 20.7 (Formula presented) data set collected with the BABAR detector. We observe a signal of (Formula presented) (Formula presented) events and determine the ratio (Formula presented) to be (Formula presented) The CP-violating charge asymmetries for the (Formula presented) and (Formula presented) decays are determined to be (Formula presented) and (Formula presented). © 2002 The American Physical Society.

Published
2002

21. Measurement of Ds+ and Ds*+ production in B meson decays and from continuum e+e- annihilation at √s = 10.6 GeV

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Dyce, N, Foster, B, Mackay, C, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, Skovpen, YI, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Lankford, AJ, Mandelkern, M, McMahon, S, and Stoker, DP

Subjects
hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

New measurements of Ds+ and Ds*+ meson production rates from B decays and from qq̄ continuum events near the Y(4S) resonance are presented. Using 20.8 fb-1 of data on the Y(4S) resonance and 2.6 fb-1 off-resonance, we find the inclusive branching fractions B(B→Ds+ X)=(10.93±0.19±0.58±2.73)% and B(B→Ds*+X)=(7.9±0.8±0.7 ±2.0)%, where the first error is statistical, the second is systematic, and the third is due to the Ds+→φπ+ branching fraction uncertainty. The production cross sections σ(e+e- →Ds+X) × B(Ds+→φπ+)=7.55±0.20 ±0.34 pb and σ(e+e-→Ds *±X) × B(Ds+→φπ+) = 5.8±0.7±0.5 pb are measured at center-of-mass energies about 40 MeV below the Y(4S) mass. The branching fractions ΣB(B→Ds(*)+ D̄(*))=(5.07±0.14±0.30±1.27)% and ∑B(B→Ds*+D̄(*)) =(4.1±0.2±0.4±1.0)% are determined from the Ds(*)+ momentum spectra. The mass difference m(Ds+)-m(D+)=98.4±0.1 ±0.3 MeV/c2 is also measured.

Published
2002

22. Study of CP-violating asymmetries in B0→π+π-, K+π- decays

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O’Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Dyce, N, Foster, B, Mackay, C, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Lankford, AJ, Mandelkern, M, McMahon, S, and Stoker, DP

Subjects
hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We present a measurement of the time-dependent CP-violating asymmetries in neutral B decays to the eigenstate, and an updated measurement of the charge asymmetry in B0→K+π-~ decays. In a sample of 33 million Y(4S)→BB̄ decays collected with the BABAR detector at the SLAC PEP-II asymmetric B factory, we find 65-11+12 and 217±18 K+π- candidates and measure the asymmetry parameters Sππ=0.03-0.56+0.53±0.111, Cππ=-0.25-0.17+0.45±0.14, and AKπ = -0.07±0. 08±0.02, where the first error is statistical and the second is systematic. © 2002 The American Physical Society.

Published
2002

23. Direct CP violation searches in charmless hadronic B meson decays

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O’Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Dyce, N, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, and Arisaka, K

Subjects
hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We search for direct CP violation in charmless hadronic B decays observed in a sample of about 22.7 million B B̄ pairs collected with the BABAR detector at the SLAC PEP-II asymmetric-energy e+e- collider. We measure the following charge asymmetries: ACp(B ±→η′K±=-0.11±0. 11±0.02, ACP(B±→ωπ ±) = -0.01 -0.31+0.29±0.03, ACPB±→φK±)= -0.05±0.20±0.03, ACP(B± → φK*±)= -0.430.30+0.36±0.06, and ACP(B0→φ K*0)=0.00±0.27±0.03. © 2002 The American Physical Society.

Published
2002

24. Measurement of B --> K*gamma branching fractions and charge asymmetries.

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Zisman, MS, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, and Serednyakov, SI

Subjects
BABAR Collaborations, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The branching fractions of the exclusive decays B0-->K(*0)gamma and B+-->K(*+)gamma are measured from a sample of (22.74+/-0.36)x10(6) BB decays collected with the BABAR detector at the PEP-II asymmetric e(+)e(-) collider. We find B (B0-->K(*0)gamma) = [4.23+/-0.40(stat)+/-0.22(syst)]x10(-5), B(B+-->K(*+)gamma) = [3.83+/-0.62(stat)+/-0.22(syst)]x10(-5) and constrain the CP-violating charge asymmetry to be -0.170K(*)gamma)

Published
2002

25. The BABAR detector

Author

Aubert, B, Bazan, A, Boucham, A, Boutigny, D, De Bonis, I, Favier, J, Gaillard, JM, Jeremie, A, Karyotakis, Y, Le Flour, T, Lees, JP, Lieunard, S, Petitpas, P, Robbe, P, Tisserand, V, Zachariadou, K, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Amerman, L, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Clark, AR, Dardin, S, Day, C, Dow, SF, Fan, Q, Gaponenko, I, Gill, MS, Goozen, FR, Gowdy, SJ, Gritsan, A, Groysman, Y, Hernikl, C, Jacobsen, RG, Jared, RC, Kadel, RW, Kadyk, J, Karcher, A, Kerth, LT, Kipnis, I, Kluth, S, Kral, JF, Lafever, R, LeClerc, C, Levi, ME, Lewis, SA, Lionberger, C, Liu, T, Long, M, Luo, L, Lynch, G, Luft, P, Mandelli, E, Marino, M, Marks, K, Matuk, C, Meyer, AB, Minor, R, Mokhtarani, A, Momayezi, M, Nyman, M, Oddone, PJ, Ohnemus, J, Oshatz, D, Patton, S, Pedrali-Noy, M, Perazzo, A, Peters, C, Pope, W, Pripstein, M, Quarrie, DR, Rasson, JE, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Stone, R, Strother, PD, Telnov, AV, von der Lippe, H, Weber, TF, Wenzel, WA, Zizka, G, Bright-Thomas, PG, Hawkes, CM, Kirk, A, Knowles, DJ, and O'Neale, SW

Subjects
hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences
Abstract

BABAR, the detector for the SLAC PEP-II asymmetric e+e- B Factory operating at the γ(4S) resonance, was designed to allow comprehensive studies of CP-violation in B-meson decays. Charged particle tracks are measured in a multi-layer silicon vertex tracker surrounded by a cylindrical wire drift chamber. Electromagnetic showers from electrons and photons are detected in an array of CsI crystals located just inside the solenoidal coil of a superconducting magnet. Muons and neutral hadrons are identified by arrays of resistive plate chambers inserted into gaps in the steel flux return of the magnet. Charged hadrons are identified by dE/dx measurements in the tracking detectors and by a ring-imaging Cherenkov detector surrounding the drift chamber. The trigger, data acquisition and data-monitoring systems, VME- and network-based, are controlled by custom-designed online software. Details of the layout and performance of the detector components and their associated electronics and software are presented. © 2002 Elsevier Science B.V. All rights reserved.

Published
2002

26. Measurement of the branching fractions for ψ(2S)→e+e- and ψ(2S)→μ+μ-

Author

Aubert, B, Boutigny, D, Gaillard, J-M, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, Yu G, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O’Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, Skovpen, Yu I, Telnov, VI, Yushkov, AN, Best, D, and Lankford, AJ

Subjects
hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

We measure the branching fractions of the Ψ(2S) meson to the leptonic final states e+e- and μ+μ- relative to that for Ψ(2S)→J/Ψπ_. The method uses Ψ(2S) mesons produced in the decay of B mesons at the Y(45) resonance in a data sample collected with the BABAR detector at the Stanford Linear Accelerator Center. Using previous measurements for the Ψ(2S) →J/Ψπ+π- branching fraction, we determine the e+e- and π+π- branching fractions to be 0.0078±0.0009±0.0008 and 0.0067±0. 0008±0.0007, respectively. © 2001 The American Physical Society.

Published
2002

27. Measurement of [Formula Presented] and [Formula Presented] production in [Formula Presented] meson decays and from continuum [Formula Presented] annihilation at [Formula Presented] GeV

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Dyce, N, Foster, B, Mackay, C, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, Skovpen, YI, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Lankford, AJ, Mandelkern, M, McMahon, S, and Stoker, DP

Subjects
Brain Disorders, Intellectual and Developmental Disabilities (IDD), Down Syndrome, hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

New measurements of (Formula presented) and (Formula presented) meson production rates from B decays and from (Formula presented) continuum events near the (Formula presented) resonance are presented. Using 20.8 (Formula presented) of data on the (Formula presented) resonance and 2.6 (Formula presented) off-resonance, we find the inclusive branching fractions (Formula presented) and (Formula presented) where the first error is statistical, the second is systematic, and t he third is due to the (Formula presented) branching fraction uncertainty. The production cross sections (Formula presented) and (Formula presented) are measured at center-of-mass energies about 40 MeV below the (Formula presented) mass. The branching fractions (Formula presented) and (Formula presented) are determined from the (Formula presented) momentum spectra. The mass difference (Formula presented) is also measured. © 2002 The American Physical Society.

Published
2002

28. Measurement of the branching fractions for Ψ(2S)→e +e- and Ψ(2S)→μ+-

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, de Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, Skovpen, YI, Telnov, VI, Yushkov, AN, Best, D, and Lankford, AJ

Subjects
hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We measure the branching fractions of the Ψ(2S) meson to the leptonic final states e+e- and μ+μ- relative to that for Ψ(2S)→J/Ψπ_. The method uses Ψ(2S) mesons produced in the decay of B mesons at the Y(45) resonance in a data sample collected with the BABAR detector at the Stanford Linear Accelerator Center. Using previous measurements for the Ψ(2S) →J/Ψπ+π- branching fraction, we determine the e+e- and π+π- branching fractions to be 0.0078±0.0009±0.0008 and 0.0067±0. 0008±0.0007, respectively. © 2001 The American Physical Society.

Published
2002

29. Study of CP-violating asymmetries in B0→ π+π-K+π- decays

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Kong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Dyce, N, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, YI, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, and Stoker, DP

Subjects
hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We present a measurement of the time-dependent CP-violating asymmetries in neutral B decays to the eigenstate, and an updated measurement of the charge asymmetry in B0→K+π-~ decays. In a sample of 33 million Y(4S)→BB̄ decays collected with the BABAR detector at the SLAC PEP-II asymmetric B factory, we find 65-11+12 and 217±18 K+π- candidates and measure the asymmetry parameters Sππ=0.03-0.56+0.53±0.111, Cππ=-0.25-0.17+0.45±0.14, and AKπ = -0.07±0. 08±0.02, where the first error is statistical and the second is systematic. © 2002 The American Physical Society.

Published
2002

30. Study of [Formula Presented] and [Formula Presented] decays: Measurement of the ratio of branching fractions and search for direct CP-violating charge asymmetries

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Pompili, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Stugu, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Lynch, G, Oddone, PJ, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Harrison, TJ, Hawkes, CM, Knowles, DJ, O Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, Foster, B, Mackay, C, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Serednyakov, SI, Skovpen, YI, Telnov, VI, Yushkov, AN, Best, D, Chao, M, Kirkby, D, Lankford, AJ, Mandelkern, M, McMahon, S, Stoker, DP, Arisaka, K, Buchanan, C, Chun, S, MacFarlane, DB, and Prell, S

Subjects
hep-ex, Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract

We have studied the (Formula presented) and (Formula presented) decays using a 20.7 (Formula presented) data set collected with the BABAR detector. We observe a signal of (Formula presented) (Formula presented) events and determine the ratio (Formula presented) to be (Formula presented) The CP-violating charge asymmetries for the (Formula presented) and (Formula presented) decays are determined to be (Formula presented) and (Formula presented). © 2002 The American Physical Society.

Published
2002

31. Search for the decay B0-->gammagamma.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, and Skovpen, YI

Subjects
BABAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We present a limit on the branching fraction for the decay B0-->gammagamma using data collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric energy e+e- collider. Based on the observation of one event in the signal region, out of a sample of 21.3x10(6) e+e--->Upsilon(4S)-->BB decays, we establish an upper limit on the branching fraction of B(B0-->gammagamma)

Published
2001

32. Measurement of the B--> J/psiK*(892) decay amplitudes.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Kirk, A, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, and Serednyakov, SI

Subjects
BABAR Collaboration, hep-ex, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We present a measurement of the decay amplitudes in B-->J/psiK*(892) channels using 20.7 fb(-1) of data collected at the Upsilon(4S) resonance with the BABAR detector at PEP-II. We measure a P-wave fraction R(perpendicular) = (16.0 +/- 3.2 +/- 1.4)% and a longitudinal polarization fraction (59.7 +/- 2.8 +/- 2.4)%. The measurement of a relative phase that is neither 0 nor pi, phi = 2.50 +/- 0.20 +/-0.08 radians, favors a departure from the factorization hypothesis. Although the decay B-->/psiK(pi) proceeds mainly via K*(892), there is also evidence for K2*(1430) and K(pi) S-wave contributions.

Published
2001

33. Measurements of the branching fractions of exclusive charmless B meson decays with eta(') or omega mesons.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, and Skovpen, YI

Subjects
BARBAR Collaboration, Prevention, Complementary and Integrative Health, hep-ex, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We present the results of searches for B decays to charmless two-body final states containing eta(') or omega mesons, based on 20.7 fb(-1) of data collected with the BABAR detector. We find the branching fractions Beta(B(+)-->eta(')K(+)) = (70+/-8+/-5) x 10(-6), Beta(B(0)-->eta(')K(0)) = (42(+13)(-11) +/- 4) x 10(-6), and Beta(B(+)-->omega pi(+)) = (6.6(+2.1)(-1.8) +/- 0.7) x 10(-6), where the first error quoted is statistical and the second is systematic. We give measurements of four additional modes for which the 90% confidence level upper limits are Beta(B(+)-->eta(')pi(+)) < 12 x 10(-6), Beta(B(+)-->omega K(+)) < 4 x 10(-6), Beta(B(0)-->omega K(0)) < 13 x 10(-6), and Beta(B(0)-->omega pi(0)) < 3 x 10(-6).

Published
2001

34. Measurement of the B(0) and B(+) meson lifetimes with fully reconstructed hadronic final states.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, Serednyakov, SI, and Skovpen, YI

Subjects
BABAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The B(0) and B(+) meson lifetimes have been measured in e(+)e(-) annihilation data collected in 1999 and 2000 with the BABAR detector at center-of-mass energies near the Upsilon(4S) resonance. Events are selected in which one B meson is fully reconstructed in a hadronic final state while the second B meson is reconstructed inclusively. A combined fit to the B(0) and the B(+) decay time difference distributions yields tau(B(0)) = 1.546+/-0.032(stat)+/-0.022(syst) ps, tau(B(+)) = 1.673+/-0.032(stat)+/-0.023(syst) ps, and tau(B(+))/tau(B(0)) = 1.082+/-0.026(stat)+/-0.012(syst).

Published
2001

35. Measurement of the decays B--> phiK and B--> phiK*.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Fan, Q, Gill, MS, Gowdy, SJ, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Kirk, A, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, Mass, A, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Camanzi, B, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Dubrovin, MS, Golubev, VB, Ivanchenko, VN, and Korol, AA

Subjects
BARBAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have observed the decays B--> phiK and phiK(*) in a sample of over 45 million B mesons collected with the BABAR detector at the PEP-II collider. The measured branching fractions are B(B+--> phiK+) = (7.7(+1.6)(-1.4)+/-0.8)x10(-6), B(B0--> phiK0) = (8.1(+3.1)(-2.5)+/-0.8)x10(-6), B(B+--> phiK(*+)) = (9.7(+4.2)(-3.4)+/-1.7)x10(-6), and B(B0--> phiK(*0)) = (8.7(+2.5)(-2.1)+/-1.1)x10(-6). We also report the upper limit B(B+--> phipi(+))

Published
2001

36. Measurement of J/psi production in continuum e(+)e(-) annihilations near square root of s = 10.6 GeV.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Fan, Q, Gill, MS, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Kirk, A, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, Mass, A, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Camanzi, B, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Dubrovin, MS, Golubev, VB, Ivanchenko, VN, and Korol, AA

Subjects
BABAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The production of J/psi mesons in continuum e(+)e(-) annihilations has been studied with the BABAR detector at energies near the Upsilon(4S) resonance. The mesons are distinguished from J/psi production in B decays through their center-of-mass momentum and energy. We measure the cross section e(+)e(-)-->J/psi X to be 2.52+/-0.21+/-0.21 pb. We set a 90% C.L. upper limit on the branching fraction for direct Upsilon(4S)-->J/psi X decays at 4.7 x 10(-4).

Published
2001

37. Measurement of branching fractions and search for CP-violating charge asymmetries in charmless two-body B decays into pions and kaons.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Fan, Q, Gill, MS, Gowdy, SJ, Gritsan, A, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Kirk, A, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, Mass, A, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Camanzi, B, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Dubrovin, MS, Golubev, VB, Ivanchenko, VN, and Korol, AA

Subjects
BABAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We present measurements, based on a sample of approximately 23x10(6) BB pairs, of the branching fractions and a search for CP-violating charge asymmetries in charmless hadronic decays of B mesons into two-body final states of kaons and pions. We find the branching fractions B(B0-->pi(+)pi(-)) = (4.1+/-1.0+/-0.7)x10(-6), B(B0-->K+pi(-)) = (16.7+/-1.6+/-1.3)x10(-6), B(B+-->K+pi(0)) = (10.8(+2.1)(-1.9)+/-1.0)x10(-6), B(B+-->K0pi(+)) = (18.2(+3.3)(-3.0)+/-2.0)x10(-6), B(B0-->K0pi(0)) = (8.2(+3.1)(-2.7)+/-1.2)x10(-6). We also report 90% confidence level upper limits for B meson decays to the pi(+)pi(0), K+K-, and K0K+ final states. In addition, charge asymmetries have been found to be consistent with zero, where the statistical precision is in the range of +/-0.10 to +/-0.18, depending on the decay mode.

Published
2001

38. Observation of CP violation in the B(0) meson system.

Author

Aubert, B, Boutigny, D, Gaillard, JM, Hicheur, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Gill, MS, Gritsan, AV, Groysman, Y, Jacobsen, RG, Kadel, RW, Kadyk, J, Kerth, LT, Kluth, S, Kolomensky, YG, Kral, JF, LeClerc, C, Levi, ME, Liu, T, Lynch, G, Meyer, AB, Momayezi, M, Oddone, PJ, Perazzo, A, Pripstein, M, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Telnov, AV, Wenzel, WA, Zisman, MS, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Knowles, DJ, O'Neale, SW, Penny, RC, Watson, AT, Watson, NK, Deppermann, T, Goetzen, K, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, Barlow, NR, Bhimji, W, Chevalier, N, Clark, PJ, Cottingham, WN, De Groot, N, Dyce, N, Foster, B, McFall, JD, Wallom, D, Wilson, FF, Abe, K, Hearty, C, Mattison, TS, McKenna, JA, Thiessen, D, Jolly, S, McKemey, AK, Tinslay, J, Blinov, VE, Bukin, AD, Bukin, DA, Buzykaev, AR, Golubev, VB, Ivanchenko, VN, Korol, AA, Kravchenko, EA, Onuchin, AP, Salnikov, AA, and Serednyakov, SI

Subjects
BABAR Collaboration, hep-ex, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of Upsilon(4S) decays collected in 2001, bringing the data available to 32 x 10(6) BB macro pairs. We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result sin2 beta = 0.59+/-0.14(stat)+/-0.05(syst) establishes CP violation in the B(0) meson system. We also determine absolute value of lambda = 0.93+/-0.09(stat)+/-0.03(syst), consistent with no direct CP violation.

Published
2001

39. Measurement of CP-Violating Asymmetries in B0 Decays to CP Eigenstates

Author

Aubert, B, Boutigny, D, De Bonis, I, Gaillard, J-M, Jeremie, A, Karyotakis, Y, Lees, JP, Robbe, P, Tisserand, V, Palano, A, Chen, GP, Chen, JC, Qi, ND, Rong, G, Wang, P, Zhu, YS, Eigen, G, Reinertsen, PL, Stugu, B, Abbott, B, Abrams, GS, Borgland, AW, Breon, AB, Brown, DN, Button-Shafer, J, Cahn, RN, Clark, AR, Dardin, S, Day, C, Dow, SF, Elioff, T, Fan, Q, Gaponenko, I, Gill, MS, Goozen, FR, Gowdy, SJ, Gritsan, A, Groysman, Y, Jacobsen, RG, Jared, RC, Kadel, RW, Kadyk, J, Karcher, A, Kerth, LT, Kipnis, I, Kluth, S, Kolomensky, Yu G, Kral, JF, Lafever, R, LeClerc, C, Levi, ME, Lewis, SA, Lionberger, C, Liu, T, Long, M, Lynch, G, Marino, M, Marks, K, Meyer, AB, Mokhtarani, A, Momayezi, M, Nyman, M, Oddone, PJ, Ohnemus, J, Oshatz, D, Patton, S, Perazzo, A, Peters, C, Pope, W, Pripstein, M, Quarrie, DR, Rasson, JE, Roe, NA, Romosan, A, Ronan, MT, Shelkov, VG, Stone, R, Telnov, AV, von der Lippe, H, Weber, T, Wenzel, WA, Zisman, MS, Bright-Thomas, PG, Harrison, TJ, Hawkes, CM, Kirk, A, Knowles, DJ, O'Neale, SW, Watson, AT, Watson, NK, Deppermann, T, Koch, H, Krug, J, Kunze, M, Lewandowski, B, Peters, K, Schmuecker, H, Steinke, M, Andress, JC, and Barlow, NR

Subjects
BABAR Collaboration, hep-ex, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23x10(6) Upsilon(4S)-->BbarB decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we find events in which one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay time distributions in such events. The result is sin2beta = 0.34+/-0.20 (stat)+/-0.05 (syst).

Published
2001

40. BES upgrade

Author

Bai, JZ, Bao, HC, Blum, I, Chai, ZW, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Chu, XM, Cui, XZ, Ding, HL, Ding, WY, Dong, LY, Du, YY, Du, ZZ, Dunwoodie, W, Fang, J, Fang, WZ, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Guo, YN, Han, HG, Han, SW, Harris, FA, Han, Y, He, J, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HB, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, GS, Huang, JD, Huang, YZ, Izen, JM, Jiang, CH, Jiang, YY, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, F, Li, HB, Li, J, Li, PQ, Li, Q, Li, RB, Li, W, Li, WD, Li, WG, Li, WH, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, JH, Liu, Q, Liu, QJ, Liu, RG, Liu, Y, Liu, ZX, Lou, JS, Lou, XC, Lowery, B, Lu, HY, Lu, JG, Luo, H, Luo, SQ, Luo, XL, Ma, EC, Ma, JM, Malchow, R, Mandelkern, M, Mao, HS, Mao, ZP, Meng, XC, Mo, XH, and Mu, LG

Subjects
detectors, DAQ, drift chambers, scintillation counters, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The Beijing Spectrometer (BES) detector is a general purpose solenoid detector at the Beijing Electron Positron Collider in Beijing, China. The recent upgrade of the initial BES detector to the improved BES II detector is described. A new drift chamber, time-of-flight counter, luminosity monitor compatible with a low-β lattice was built as well as the vertex chamber.

Published
2001

41. The BES upgrade

Author

Bai, JZ, Bao, HC, Blum, I, Chai, ZW, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Chu, XM, Cui, XZ, Ding, HL, Ding, WY, Dong, LY, Du, YY, Du, ZZ, Dunwoodie, W, Fang, J, Fang, WZ, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Guo, YN, Han, HG, Han, SW, Harris, FA, Han, Y, He, J, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HB, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, GS, Huang, JD, Huang, YZ, Izen, JM, Jiang, CH, Jiang, YY, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, F, Li, HB, Li, J, Li, PQ, Li, Q, Li, RB, Li, W, Li, WD, Li, WG, Li, WH, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, JH, Liu, Jun, Liu, Q, Liu, QJ, Liu, RG, Liu, Y, Liu, ZX, Lou, JS, Lou, XC, Lowery, B, Lu, HY, Lu, JG, Luo, H, Luo, SQ, Luo, XL, Ma, EC, Ma, JM, Malchow, R, Mandelkern, M, Mao, HS, Mao, ZP, Meng, XC, Mo, XH, and Mu, LG

Subjects
detectors, DAQ, drift chambers, scintillation counters, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics
Abstract

The Beijing Spectrometer (BES) detector is a general purpose solenoid detector at the Beijing Electron Positron Collider in Beijing, China. The recent upgrade of the initial BES detector to the improved BES II detector is described. A new drift chamber, time-of-flight counter, luminosity monitor compatible with a low-β lattice was built as well as the vertex chamber.

Published
2001

42. Direct measurement of B(D0→φX0) and B(D+→φX+)

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, YN, Guo, ZJ, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, YZ, Huang, GS, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, C., E, M., J, Malchow, R, Mandelkern, M, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Schmid, B, and Schultz, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

The first measurement of (Formula presented) and an upper limit for (Formula presented) are determined from 22.3 (Formula presented) of (Formula presented) annihilation data at a c.m. energy of 4.03 GeV. The data were recorded by the Beijing Spectrometer (BES) at BEPC. A recoil charge method is applied to charm threshold data to determine the charge of the D meson in the recoil from (Formula presented) reconstructed (Formula presented) (Formula presented) mesons. The branching fractions (Formula presented) and (Formula presented) are determined from 10 events with a reconstructed D and a recoiling (Formula presented) In addition, a 90% C.L. upper limit of (Formula presented) is determined from a search for semileptonic decays of the (Formula presented) © 2000 The American Physical Society.

Published
2000

43. ψ(2S)→π+π-J/ψ decay distributions

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, ZJ, Guo, YN, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, GS, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, C., E, M., J, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Shao, YY, Shen, BW, and Shen, DL

Subjects
Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Using a sample of 3.8 M (Formula presented) events accumulated with the BES detector, the process (Formula presented) is studied. The angular distributions are compared with the general decay amplitude analysis of Cahn. We find that the dipion system requires some D wave amplitude, as well as S wave. On the other hand, the (Formula presented) relative angular momentum is consistent with being pure S wave. The decay distributions have been fit to heavy quarkonium models, including the Novikov-Shifman model. This model, which is written in terms of the parameter (Formula presented) predicts that D wave pions should be present. We determine (Formula presented) based on the joint (Formula presented) distribution. The fraction of D wave amplitude as a function of (Formula presented) is found to decrease with increasing (Formula presented) in agreement with the model. We have also fit the Mannel-Yan model, which is another model that allows D wave pions. © 2000 The American Physical Society.

Published
2000

44. Measurement of the inclusive charm cross section at 4.03 GeV and 4.14 GeV

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, YN, Guo, ZJ, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, YZ, Huang, GS, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, C., E, M., J, Malchow, R, Mandelkern, M, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Schmid, B, and Schultz, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

The cross section for charmed meson production at √s=4.03 and 4.14 GeV has been measured with the Beijing Spectrometer. The measurement was made using 22.3 pb-1 of e+e- data collected at 4.03 GeV and 1.5 pb-1 of e+e- data collected at 4.14 GeV. Inclusive observed cross sections for the production of charged and neutral D mesons and momentum spectra are presented. Observed cross sections were radiatively corrected to obtain tree level cross sections. Measurements of the total hadronic cross section are obtained from the charmed meson cross section and an extrapolation of results from below the charm threshold. ©2000 The American Physical Society.

Published
2000

45. [formula presented] decay distributions

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, ZJ, Guo, YN, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, GS, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, Ma, EC, Ma, JM, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Shao, YY, Shen, BW, and Shen, DL

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Using a sample of 3.8 M (Formula presented) events accumulated with the BES detector, the process (Formula presented) is studied. The angular distributions are compared with the general decay amplitude analysis of Cahn. We find that the dipion system requires some D wave amplitude, as well as S wave. On the other hand, the (Formula presented) relative angular momentum is consistent with being pure S wave. The decay distributions have been fit to heavy quarkonium models, including the Novikov-Shifman model. This model, which is written in terms of the parameter (Formula presented) predicts that D wave pions should be present. We determine (Formula presented) based on the joint (Formula presented) distribution. The fraction of D wave amplitude as a function of (Formula presented) is found to decrease with increasing (Formula presented) in agreement with the model. We have also fit the Mannel-Yan model, which is another model that allows D wave pions. © 2000 The American Physical Society.

Published
2000

46. Direct measurement of [formula presented] and [formula presented]

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, YN, Guo, ZJ, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Heng, YK, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, YZ, Huang, GS, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, Ma, EC, Ma, JM, Malchow, R, Mandelkern, M, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Schmid, B, and Schultz, J

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The first measurement of (Formula presented) and an upper limit for (Formula presented) are determined from 22.3 (Formula presented) of (Formula presented) annihilation data at a c.m. energy of 4.03 GeV. The data were recorded by the Beijing Spectrometer (BES) at BEPC. A recoil charge method is applied to charm threshold data to determine the charge of the D meson in the recoil from (Formula presented) reconstructed (Formula presented) (Formula presented) mesons. The branching fractions (Formula presented) and (Formula presented) are determined from 10 events with a reconstructed D and a recoiling (Formula presented) In addition, a 90% C.L. upper limit of (Formula presented) is determined from a search for semileptonic decays of the (Formula presented) © 2000 The American Physical Society.

Published
2000

47. Study of the hadronic decays of χc states

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, YN, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, C., E, M., J, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Shao, YY, Shen, BW, Shen, DL, Shen, H, Shen, XY, and Sheng, HY

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Hadronic decays of the P-wave spin-triplet charmonium states (Formula presented) are studied using a sample of (Formula presented) decays collected by the BES detector operating at the BEPC storage ring. Branching fractions for the decays (Formula presented) (Formula presented) (Formula presented) (Formula presented) (Formula presented) and (Formula presented) are measured for the first time, and those for (Formula presented) (Formula presented) (Formula presented) and (Formula presented) are measured with improved precision. In addition, we determine the masses of the (Formula presented) and (Formula presented) to be (Formula presented) and (Formula presented) © 1999 The American Physical Society.

Published
1999

48. Charmonium Decays to Axial-Vector Plus Pseudoscalar Mesons

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, YN, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, C., E, M., J, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Shao, YY, Shen, BW, Shen, DL, Shen, H, Shen, XY, Sheng, HY, Shi, HZ, and Song, XF

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

A sample of 3.79 × 106ψ(2S) events is used to study the decays of charmonium to axial-vector plus pseudoscalar mesons. The branching fraction for the decay ψ(2S) → b±1(1235)π∓ agrees with expectations based on scaling the corresponding J/ψ branching fraction. Flavor-SU(3)-violating K1(1270)- K1(1400) asymmetries with opposite character for ψ(2S) and J/ψ decays are observed. This contrasting behavior cannot be accommodated by adjustments of the singlet-triplet mixing angle. © 1999 The American Physical Society.

Published
1999

49. Study of the hadronic decays of [formula presented] states

Author

Bai, JZ, Ban, Y, Bian, JG, Blum, I, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Dong, LY, Du, ZZ, Dunwoodie, W, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, YN, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, KL, He, M, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Jones, BD, Ju, X, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, JC, Li, PQ, Li, RB, Li, W, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Luo, XL, Ma, EC, Ma, JM, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Shao, YY, Shen, BW, Shen, DL, Shen, H, Shen, XY, and Sheng, HY

Subjects
Nuclear & Particles Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

Hadronic decays of the P-wave spin-triplet charmonium states (Formula presented) are studied using a sample of (Formula presented) decays collected by the BES detector operating at the BEPC storage ring. Branching fractions for the decays (Formula presented) (Formula presented) (Formula presented) (Formula presented) (Formula presented) and (Formula presented) are measured for the first time, and those for (Formula presented) (Formula presented) (Formula presented) and (Formula presented) are measured with improved precision. In addition, we determine the masses of the (Formula presented) and (Formula presented) to be (Formula presented) and (Formula presented) © 1999 The American Physical Society.

Published
1999

50. ψ(2S) Hadronic Decays to Vector-Tensor Final States

Author

Bai, JZ, Bian, JG, Blum, I, Chai, ZW, Chen, GP, Chen, HF, Chen, J, Chen, JC, Chen, Y, Chen, YB, Chen, YQ, Cheng, BS, Cui, XZ, Ding, HL, Ding, LY, Dong, LY, Du, ZZ, Dunwoodie, W, Feng, S, Gao, CS, Gao, ML, Gao, SQ, Gratton, P, Gu, JH, Gu, SD, Gu, WX, Gu, YF, Guo, YN, Han, SW, Han, Y, Harris, FA, He, J, He, JT, He, M, Hitlin, DG, Hu, GY, Hu, HM, Hu, JL, Hu, QH, Hu, T, Hu, XQ, Huang, JD, Huang, YZ, Izen, JM, Jiang, CH, Jin, Y, Ke, ZJ, Kelsey, MH, Kim, BK, Kong, D, Lai, YF, Lang, PF, Lankford, A, Li, CG, Li, D, Li, HB, Li, J, Li, PQ, Li, RB, Li, W, Li, WD, Li, WG, Li, XH, Li, XN, Liu, HM, Liu, J, Liu, JH, Liu, RG, Liu, Y, Lou, XC, Lowery, B, Lu, F, Lu, JG, Lu, JY, Lu, LC, Luo, CH, M., A, C., E, M., J, Malchow, R, Mao, HS, Mao, ZP, Meng, XC, Nie, J, Olsen, SL, Oyang, J, Paluselli, D, Pan, LJ, Panetta, J, Porter, F, Qi, ND, Qi, XR, Qian, CD, Qiu, JF, Qu, YH, Que, YK, Rong, G, Schernau, M, Shao, YY, and Shen, BW

Subjects
Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

The decays of the ψ(2S) into vector plus tensor meson final states have been studied for the first time using the BES detector. We determine upper limits on branching fractions for ψ(2S) decays into ωf2, ρa2, K*0K*02 + c.c., and φf'2(1525) that are, in each case, significantly smaller than the corresponding branching fractions for the J/ψ meson, scaled according to the expectations of perturbative QCD. © 1998 The American Physical Society.

Published
1998

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