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Limits on the decay-rate difference of neutral B mesons and on CP, T, and CPT violation in B0B̄0 oscillations

Physical Review D - Particles, Fields, Gravitation and Cosmology 70:1 (2004)

Authors:

B Aubert, R Barate, D Boutigny, F Couderc, JM Gaillard, A Hicheur, Y Karyotakis, JP Lees, V Tisserand, A Zghiche, A Palano, A Pompili, JC Chen, ND Qi, G Rong, P Wang, YS Zhu, G Eigen, I Ofte, B Stugu, GS Abrams, AW Borgland, AB Breon, DN Brown, J Button-Shafer, RN Cahn, E Charles, CT Day, MS Gill, AV Gritsan, Y Groysman, RG Jacobsen, RW Kadel, J Kadyk, LT Kerth, YG Kolomensky, G Kukartsev, C LeClerc, G Lynch, AM Merchant, LM Mir, PJ Oddone, TJ Orimoto, M Pripstein, NA Roe, MT Ronan, VG Shelkov, AV Telnov, WA Wenzel, K Ford, TJ Harrison, CM Hawkes, SE Morgan, AT Watson, M Fritsch, K Goetzen, T Held, H Koch, B Lewandowski, M Pelizaeus, M Steinke, JT Boyd, N Chevalier, WN Cottingham, MP Kelly, TE Latham, FF Wilson, T Cuhadar-Donszelmann, C Hearty, TS Mattison, JA McKenna, D Thiessen, P Kyberd, L Teodorescu, VE Blinov, AD Bukin, VP Druzhinin, VB Golubev, VN Ivanchenko, EA Kravchenko, AP Onuchin, SI Serednyakov, YI Skovpen, EP Solodov, AN Yushkov, D Best, M Bruinsma, M Chao, I Eschrich, D Kirkby, AJ Lankford, M Mandelkern, RK Mommsen, W Roethel, DP Stoker, C Buchanan, BL Hartfiel, JW Gary, BC Shen, K Wang

Abstract:

Using events in which one of two neutral B mesons from the decay of an Y(4S) resonance is fully reconstructed, we set limits on the difference between the decay rates of the two neutral B mass eigenstates and on CP, T, and CPT violation in B0B̄0 mixing. The reconstructed decays, comprising both CP and flavor eigenstates, are obtained from 88 million Y(4S)→BB̄ decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We determine six independent parameters governing oscillations (Δm,ΔΓ/Γ), CPT and CP violation (Re z,Im z), and CP and T violation (Im λCP,|q/p|), where λCP characterizes B0 and B̄0 decays to states of charmonium plus KS0 or KL0. The results are sgn(Re λCP)ΔΓ/ Γ=-0.008±0.037(stat.)±0.018(syst.)[-0.084,0.068], |q/p|=1.029±0.013(stat.)±0.011(syst.)[1.001,1.057], (Re λCP|λCP|)Re z=0.014±0.035(stat.) ±0.034(syst.)[-0.072,0.101], Im z=0.038±0.029(stat.)±0.025 (syst.)[-0.028,0.104]. The values inside square brackets indicate the 90% confidence-level intervals. The values of Im λCP and Δm are consistent with previous analyses and are used as cross checks. These measurements are in agreement with standard model expectations.
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Measurement of branching fractions and CP and isospin asymmetries for B → K* γ

Physical Review D - Particles, Fields, Gravitation and Cosmology 70:11 (2004)

Authors:

B Aubert, R Barate, Boutigny, F Couderc, JM Gaillard, A Hicheur, Y Karyotakis, JP Lees, V Tisserand, A Zghiche, A Palano, A Pompili, JC Chen, ND Qi, G Rong, P Wang, YS Zhu, G Eigen, I Ofte, B Stugu, GS Abrams, AW Borgland, AB Breon, DN Brown, J Button-Shafer, RN Cahn, E Charles, CT Day, MS Gill, AV Gritsan, Y Groysman, RG Jacobsen, RW Kadel, J Kadyk, LT Kerth, Yu. G. Kolomensky, G Kukartsev, G Lynch, LM Mir, PJ Oddone, TJ Orimoto, M Pripstein, NA Roe, MT Ronan, VO Shelkov, WA Wenzel, M Barrett, KE Ford, TJ Harrison, AJ Hart, CM Hawkes, SE Morgan, AT Watson, M Fritsch, K Goetzen, T Held, H Koch, B Lewandowski, M Pelizaeus, M Steinke, JT Boyd, N Chevalier, WN Cottingham, MP Kelly, TE Latham, FF Wilson, T Cuhadar-Donszelmann, C Hearty, NS Knecht, TS Mattison, JA McKenna, D Thiessen, A Khan, P Kyberd, L Teodorescu, AE Blinov, VE Blinov, VP Druzhinin, VB Golubev, VN Ivanchenko, EA Kravchenko, AP Onuchin, SI Serednyakov, Yu. I. Skovpen, EP Solodov, AN Yushkov, D Best, M Bruinsma, M Chao, I Eschrich, D Kirkby, AJ Lankford, M Mandelkern, RK Mommsen, W Roethel, DP Stoker, C Buchanan, BL Hartfiel, SD Foulkes, JW Gary

Abstract:

The branching fractions of the decays B0 → K*0 γ and B+ → K*+ γ are measured using a sample of 88 × 106BB̄ events collected with the BABAR detector at the PEP-II asymmetric-energy e +e- collider. We find B(B0 → K* γ) = [3.92 ± 0.20(stat) ± 0.24(syst)] × 10 -5, B(B+ → K*+ γ) = [3.87 ± 0.28(stat) ± 0.26(syst)] × 10-5. Our measurements also constrain the direct CP asymmetry to be -0.074 < A(B → K* γ) < 0.049 and the isospin asymmetry to be -0.046 < Δ0-̈ < 0.146, both at the 90% confidence level.
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Measurement of the B0 → K2*(1430) 0γ and B+ → K2*(1430) +γ branching fractions

Physical Review D - Particles, Fields, Gravitation and Cosmology 70:9 (2004)

Authors:

B Aubert, R Barate, D Boutigny, F Couderc, JM Gaillard, A Hicheur, Y Karyotakis, JP Lees, V Tisserand, A Zghiche, A Palano, A Pompili, JC Chen, ND Qi, G Rong, P Wang, YS Zhu, G Eigen, I Ofte, B Stugu, GS Abrams, A Borgland, AB Breon, DN Brown, J Button-Shafer, RN Cahn, E Charles, CT Day, MS Gill, AV Gritsan, Y Groysman, RG Jacobsen, RW Kadel, J Kadyk, LT Kerth, YG Kolomensky, G Kukartsev, G Lynch, LM Mir, PJ Oddone, TJ Orimoto, M Pripstein, NA Roe, MT Ronan, VG Shelkov, WA Wenzel, M Barrett, KE Ford, TJ Harrison, AJ Hart, CM Hawkes, SE Morgan, AT Watson, M Fritsch, K Goetzen, T Held, H Koch, B Lewandowski, M Pelizaeus, M Steinke, JT Boyd, N Chevalier, WN Cottingham, MP Kelly, TE Latham, FF Wilson, T Cuhadar-Donszelmann, C Hearty, NS Knecht, TS Mattison, JA McKenna, D Thiessen, A Khan, P Kyberd, L Teodorescu, AE Blinov, VE Blinov, VP Druzhinin, VB Golubev, VN Ivanchenko, EA Kravchenko, AP Onuchin, SI Serednyakov, YI Skovpen, EP Solodov, AN Yushkov, D Best, M Bruinsma, M Chao, I Eschrich, D Kirkby, AJ Lankford, M Mandelkern, RK Mommsen, W Roethel, DP Stoker, C Buchanan, BL Hartfiel, SD Foulkes, JW Gary

Abstract:

We have investigated the exclusive, radiative B meson decays to K 2*(1430) in 89 × 106 BB̄ events with the BABAR detector at the PEP-II storage ring. We measure the branching fractions B(B0 → K2*(1430)0γ) = (1.22 ± 0.25 ± 0.10) × 10-5 and B(B+ → K2*(1430)+γ) = (1.45 ± 0.40 ± 0.15) × 10-5, where the first error is statistical and the second systematic. In addition, we measure the CP-violating asymmetry A CP[B0 → K2*(1430) 0γ] = -0.08 ± 0.15 ± 0.01.
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Measurement of the branching fractions for inclusive B- and B̄0 decays to flavor-tagged D, Ds, and Ac

Physical Review D - Particles, Fields, Gravitation and Cosmology 70:9 (2004)

Authors:

B Aubert, R Barate, D Boutigny, F Couderc, JM Gaillard, A Hicheur, Y Karyotakis, JP Lees, V Poireau, V Tisserand, A Zghiche, A Palano, A Pompili, JC Chen, ND Qi, G Rong, P Wang, YS Zhu, G Eigen, I Ofte, B Stugu, GS Abrams, AW Borgland, AB Breon, DN Brown, J Button-Shafer, RN Cahn, E Charles, CT Day, MS Gill, AV Gritsan, Y Groysman, RG Jacobsen, RW Kadel, J Kadyk, LT Kerth, YG Kolomensky, G Kukartsev, G Lynch, LM Mir, PJ Oddone, TJ Orimoto, M Pripstein, NA Roe, MT Ronan, VG Shelkov, WA Wenzel, M Barrett, KE Ford, TJ Harrison, AJ Hart, CM Hawkes, SE Morgan, AT Watson, M Fritsch, K Goetzen, T Held, H Koch, B Lewandowski, M Pelizaeus, M Steinke, JT Boyd, N Chevalier, WN Cottingham, MP Kelly, TE Latham, FF Wilson, T Cuhadar-Donszelmann, C Hearty, NS Knecht, TS Mattison, JA McKenna, D Thiessen, A Khan, P Kyberd, L Teodorescu, AE Blinov, VE Blinov, VP Druzhinin, VB Golubev, VN Ivanchenko, EA Kravchenko, AP Onuchin, SI Serednyakov, YI Skovpen, EP Solodov, AN Yushkov, D Best, M Bruinsma, M Chao, I Eschrich, D Kirkby, AJ Lankford, M Mandelkern, RK Mommsen, W Roethel, DP Stoker, C Buchanan, BL Hartfiel, SD Foulkes

Abstract:

We report on the inclusive branching fractions of B- and of B̄0 mesons decaying to D0X, D̄0X, D+X, D-X, Ds+X, Ds-X, Λc+X, Λc-X, based on a sample of 88.9 × 106 BB̄ events recorded with the BABAR detector at the Υ (4S) resonance. Events are selected by completely reconstructing one B and searching for a reconstructed charmed particle in the rest of the event. We measure the number of charmed and of anticharmed particles per B decay and derive the total charm yield per B - decay nc- = 1.313 ± 0.037 ± 0.062-0.042+0.063 and per B̄0 decay n c0 = 1.276 ± 0.062 ± 0.058 -0.046+0.066, where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties.
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Measurement of the branching fraction for B±→χ c0K±

Physical Review D 69:7 (2004)

Authors:

B Aubert, R Barate, D Boutigny, JM Gaillard, A Hicheur, Y Karyotakis, JP Lees, P Robbe, V Tisserand, A Zghiche, A Palano, A Pompili, JC Chen, ND Qi, G Rong, P Wang, YS Zhu, G Eigen, I Ofte, B Stugu, GS Abrams, AW Borgland, AB Breon, DN Brown, J Button-Shafer, RN Cahn, E Charles, CT Day, MS Gill, AV Gritsan, Y Groysman, RG Jacobsen, RW Kadel, J Kadyk, LT Kerth, YG Kolomensky, JF Kral, G Kukartsev, C LeClerc, ME Levi, G Lynch, LM Mir, PJ Oddone, TJ Orimoto, M Pripstein, NA Roe, A Romosan, MT Ronan, VG Shelkov, AV Telnov, WA Wenzel, K Ford, TJ Harrison, CM Hawkes, DJ Knowles, SE Morgan, RC Penny, AT Watson, NK Watson, K Goetzen, T Held, H Koch, B Lewandowski, M Pelizaeus, K Peters, H Schmuecker, M Steinke, NR Barlow, JT Boyd, N Chevalier, WN Cottingham, MP Kelly, TE Latham, C Mackay, FF Wilson, K Abe, T Cuhadar-Donszelmann, C Hearty, TS Mattison, JA McKenna, D Thiessen, P Kyberd, AK McKemey, VE Blinov, AD Bukin, VB Golubev, VN Ivanchenko, EA Kravchenko, AP Onuchin, SI Serednyakov, YI Skovpen, EP Solodov, AN Yushkov, D Best, M Bruinsma, M Chao, D Kirkby, AJ Lankford, M Mandelkern, RK Mommsen

Abstract:

We present a measurement of the branching fraction of the decay B ±→χc0K± sample of 89×106 BB̄ pairs collected by the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. The χc0 meson is reconstructed through its two-body decays toπ+ π- and K+K-. We measure B(B± → χc0K±) ×Β(χ c0→π+π-) = [1.32-027+0.28(stat)±0.26(syst)] × 10-6 and B(B ±→ χc0K±) × B(χc0 →K+K-) = [1.49 -0.34+0.36(stat) ±0.22(syst)] × 10 -6. Using the known values for the χc0 decays branching fractions, we combine these results to obtain Β(B ± →χc0K±) = (2.7±0.7)× 10-4. © 2004 The American Physical Society.
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