Study of inclusive DS((∗)+/−)D_{S}^{((*)+/-)} production in B decays and measurement of B0→D(∗−)DS((∗)+)B^{0} \to D^{(*-)}D_{S}^{((*)+)} decays using a partial reconstruction technique

Electron-positron annihilation data collected by the BABAR detector near the Y(4S) resonance are used to study the inclusive decay of B mesons to D_S^(+/-) and D_S^(*+/-) mesons, where the D_S^(+/-) is reconstructed using the decay D_S^(+/-) --> phi pi^(+/-). The production fraction of inclusive D_S^((*)+/-) and the corresponding momentum spectra have been determined. The exclusive decays B^0 --> D^(*-)D_S^((*)+) are observed with a partial reconstruction technique which uses the soft pion from the D^(*+/-) decay in association with the reconstructed D_S^((*)+/-). The beam energy constraint is used to determine the missing mass recoiling against the D_S^(+/-) system, showing a clear signal for this process. From the observed rates, preliminary results for the corresponding branching fractions have been obtained

Measurement of branching fractions for two-body charmless B decays to charged pions and kaons at BABAR

We present preliminary results of a search for charmless two-body B decays to charged pions and kaons using data collected by the BABAR detector at the Stanford Linear Accelerator Center's PEP-II storage ring. In a sample of 8.8 million produced B-anti-B pairs we measure the branching fractions B(B^0 --> pi^+pi^-) = (9.3^{+2.6}_{-2.3}^{+1.2}_{-1.4}) x 10^{-6} and B(B^0 --> K^+\pi^-) = (12.5^{+3.0}_{-2.6}^{+1.3}_{-1.7}) x 10^{-6}, where the first uncertainty is statistical and the second is systematic. For the decay B^0 --> K^+K^- we find no significant signal and set an upper limit of B(B^0 --> K^+K^-) < 6.6 x 10^{-6} at the 90% confidence level

Search for Decays of B0 Mesons into Pairs of Leptons

We present a search for the decays B0->e+e-, B0->mu+mu-, and B0->emu in data collected at the Upsilon(4S) with the BABAR detector at the SLAC B Factory. Using a data set of 54.4 fb-1, we find no evidence for a signal and set the following preliminary upper limits at the 90% confidence level: B(B0->e+e-)mu+mu-) emu) < 2.1*10E-7

Simultaneous Measurement of the B0 Meson Lifetime and Mixing Frequency with B0 --> D*- l+ nu Decays

We measure the B0 lifetime \tau_{B0} and the B0-B0bar oscillation frequency \Delta m_d with a sample of approximately 14,000 exclusively reconstructed B0 --> D*- l+ nu signal events, selected from 23 million BBbar pairs recorded at the \Upsilon(4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The decay position of the other B is determined with the remaining tracks in the event, and its b-quark flavor at the time of decay is determined with a tagging algorithm that exploits the correlation between the flavor of the b-quark and the charges of its decay products. The lifetime and oscillation frequency are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in decay times of the two B mesons (\Delta t), the calculated uncertainty on \Delta t, the signal and background probabilities, and b-quark tagging information for the other B. The results are \tau_{B^0} = (1.523^{+0.024}_{-0.023} \pm 0.022) \rm{ps} and \Delta m_d = (0.492 \pm 0.018 \pm 0.013) \rm{ps}^{-1}. The statistical correlation coefficient between \tau_{B0} and \Delta m_d is -0.22

Measurements of Charmless Two-Body Charged B Decays with Neutral Pions and Kaons

We present preliminary results of the analyses of B into h pi0 and B into hK0 decays (with h = pi+/-, K+/-) from a sample of approximately 60 million BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find evidence for a signal in B+ into pi+ pi0, and we measure the branching fraction BR (B+ into pi+ pi0) = (4.1_{-1.0}^{+1.1}\pm 0.8) 10^{-6}. We also measure the following branching ratios and charge asymmetries: BR(B+ to K+ pi0) = (11.1_{-1.2}^{+1.3} \pm 1.0) 10^{-6}, BR(B+ to pi+ K0) = (17.5^{+1.8}_{-1.7} \pm 1.3)10^{-6}$, BR(B+ to K+ K0bar) < 1.3 10^{-6} (90$ CL), acp_{pi+ pi0} = -0.02^{+0.27}_{-0.26} \pm 0.10, acp_{K+ pi0} = 0.00\pm 0.11 \pm 0.02$, acp_{pi+ K0} =-0.17\pm 0.10 \pm 0.02, where the errors are statistical and systematic, respectively

L'ananas à l'île de La Réunion

Les ananas Victoria et "Cayenne Lisse" à la Réunion. Qualités olfactogustatives, zones de cultures et types de production. Caractéristiques et écologie de l'ananas Victori

Measurement of the B0 Lifetime with Partially Reconstructed B0 --> D*- l+ nu Decays

The B0 lifetime has been measured with a sample of 23 million BBbar pairs collected by the BaBar detector at the PEP-II e+e- storage ring during 1999 and 2000. Events from the semileptonic decay B0 --> D*- l+ nu have been selected with a partial reconstruction method in which only the charged lepton and the slow pion from the D*- --> D0bar pi- decay are reconstructed. The result is tau_B0 = 1.529+/-0.012 (stat) +/- 0.029 (syst) ps

Measurement of the B^0 -> D^*-a_1^+ Branching Fraction with Partially Reconstructed D^*

The B^0 -> D^*-a_1^+ branching fraction has been measured with data collected by the BABAR experiment in 1999 and 2000 corresponding to a total integrated luminosity of 20.6 fb^-1. Signal events have been selected using a partial reconstruction technique, in which only the a_1^+ and the slow pion (pi_s) from the D^*- decay are identified. A signal yield of 18400 +/- 1200 events has been found, corresponding to a preliminary branching fraction of (1.20 +/- 0.07(stat) +/- 0.14 (syst))%

La lutte aménagée contre les ravageurs des agrumes en Afrique du Sud et ses applications possibles pour les Mascareignes

Exposé sur la lutte amenagée contre les acariens et les insectes ravageurs des agrumes en Afrique du Sud et des possibilités de mise en oeuvre d'une lutte aménagée aux Mascareignes. Réunio

Measurements of charmless three-body and quasi-two-body B decays

We present preliminary results of a search for several exclusive charmless hadronic B decays from electron-positron annihilation data collected by the BABAR detector near the Y(4S) resonance. These include three-body decay modes with final states h^{+/-}h^{-/+}h^{+/-} and h^{+/-}h^{-/+}pi^0, and quasi-two-body decay modes with final states X^0 h and X^0 K0S, where h = pi or K and X^0 = eta^' or omega. We find B(B^0 --> rho^(-/+)pi^(+/-)) = (49+/-13^{+6}_{-5}) x 10^{-6} and B(B^+ --> eta^' K^+) = (62+/-18+/-8) x 10^{-6} and present upper limits for eight other decays