33 research outputs found

    Long-Baseline Neutrino Facility (LBNF) and Deep Underground Neutrino Experiment (DUNE) Conceptual Design Report Volume 2: The Physics Program for DUNE at LBNF

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    The Physics Program for the Deep Underground Neutrino Experiment (DUNE) at the Fermilab Long-Baseline Neutrino Facility (LBNF) is described

    Observation of charmless hadronic B decays

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    Four candidates for charmless hadronic B decay are observed in a data sample of four million hadronic Z decays recorded by the ALEPH detector at LEP. The probability that these events come from background sources is estimated to be less than 10(-6). The average branching of weakly decaying B hadrons (a mixture of B-d(0), B-s(0) and Lambda(b) weighted by their production The average branching ratio of weakly decaying B hadrons (a mixture of B-d(0) cross sections and lifetimes, here denoted B) into two long-lived charged hadrons (pions, kaons or protons) is measured to be Br(B-->h(+)h(-))=(1.7(-0.7)(+1.0)+/-0.2)x10(-5). The relative branching fraction Br(B-d(s)(0)-->pi(+)pi(-)(K-))/Br(B-d(s)(0)-->h(+)h(-)) is measured to be 1.0(-0.3-0.1)(+0.0+0.0). In addition, branching ratio upper limits are obtained for a variety of exclusive charmless hadronic two-body decays of B hadrons

    Measurement of the tau lepton lifetime with the three-dimensional impact parameter method.

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    A new method is presented for the measurement of the mean τ\tau lepton lifetime using events in which τ\tau's are pair-produced and both τ\tau's decay to hadrons and ντ\nu_\tau. Based on the correlation between the two τ\tau's produced at a symmetric e+ee^+ e^- collider, the 3DIP method relies on the three-dimensional information from a double-sided vertex detector and on kinematic constraints for the precise measurement of the τ\tau decay angles. Using the data collected from 1992 to 1994 with the ALEPH detector at LEP, a τ\tau lifetime of 288.0±3.1±1.3288.0 \pm 3.1 \pm 1.3 \fs is obtained from the sample in which both τ\tau's decay to one charged track, and 292.8±5.6±3.0292.8 \pm 5.6 \pm 3.0 \fs from the sample in which one τ\tau decays to one prong and the other to three prongs. The results show small statistical correlations with those derived from other methods. When combined with the previously published ALEPH measurements, the resulting τ\tau lifetime is 291.2±2.0±1.2291.2 \pm 2.0 \pm 1.2 \fs

    Four-fermion production in e+ee^+e^- collisions at centre-of-mass energies of 130 and 136 GeV

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    Four-fermion events have been selected in a data sample of 5.8 pb−1 collected with the aleph detector at centre-of-mass energies of 130 and 136 GeV. The final states , ℓ+ℓ−ℓ+ℓ−, , and have been examined. Five events are observed in the data, in agreement with the Standard Model predictions of 6.67±0.38 events from four-fermion processes and 0.14−0.05+0.19 from background processes

    Measurement of the tau lepton lifetime with the three-dimensional impact parameter method.

    No full text
    A new method is presented for the measurement of the mean τ\tau lepton lifetime using events in which τ\tau's are pair-produced and both τ\tau's decay to hadrons and ντ\nu_\tau. Based on the correlation between the two τ\tau's produced at a symmetric e+ee^+ e^- collider, the 3DIP method relies on the three-dimensional information from a double-sided vertex detector and on kinematic constraints for the precise measurement of the τ\tau decay angles. Using the data collected from 1992 to 1994 with the ALEPH detector at LEP, a τ\tau lifetime of 288.0±3.1±1.3288.0 \pm 3.1 \pm 1.3 \fs is obtained from the sample in which both τ\tau's decay to one charged track, and 292.8±5.6±3.0292.8 \pm 5.6 \pm 3.0 \fs from the sample in which one τ\tau decays to one prong and the other to three prongs. The results show small statistical correlations with those derived from other methods. When combined with the previously published ALEPH measurements, the resulting τ\tau lifetime is 291.2±2.0±1.2291.2 \pm 2.0 \pm 1.2 \fs

    Measurement of the tau lepton lifetime with the three-dimensional impact parameter method.

    Get PDF
    A new method is presented for the measurement of the mean τ\tau lepton lifetime using events in which τ\tau's are pair-produced and both τ\tau's decay to hadrons and ντ\nu_\tau. Based on the correlation between the two τ\tau's produced at a symmetric e+ee^+ e^- collider, the 3DIP method relies on the three-dimensional information from a double-sided vertex detector and on kinematic constraints for the precise measurement of the τ\tau decay angles. Using the data collected from 1992 to 1994 with the ALEPH detector at LEP, a τ\tau lifetime of 288.0±3.1±1.3288.0 \pm 3.1 \pm 1.3 \fs is obtained from the sample in which both τ\tau's decay to one charged track, and 292.8±5.6±3.0292.8 \pm 5.6 \pm 3.0 \fs from the sample in which one τ\tau decays to one prong and the other to three prongs. The results show small statistical correlations with those derived from other methods. When combined with the previously published ALEPH measurements, the resulting τ\tau lifetime is 291.2±2.0±1.2291.2 \pm 2.0 \pm 1.2 \fs

    Measurement of the tau lepton lifetime with the three-dimensional impact parameter method.

    Get PDF
    A new method is presented for the measurement of the mean τ\tau lepton lifetime using events in which τ\tau's are pair-produced and both τ\tau's decay to hadrons and ντ\nu_\tau. Based on the correlation between the two τ\tau's produced at a symmetric e+ee^+ e^- collider, the 3DIP method relies on the three-dimensional information from a double-sided vertex detector and on kinematic constraints for the precise measurement of the τ\tau decay angles. Using the data collected from 1992 to 1994 with the ALEPH detector at LEP, a τ\tau lifetime of 288.0±3.1±1.3288.0 \pm 3.1 \pm 1.3 \fs is obtained from the sample in which both τ\tau's decay to one charged track, and 292.8±5.6±3.0292.8 \pm 5.6 \pm 3.0 \fs from the sample in which one τ\tau decays to one prong and the other to three prongs. The results show small statistical correlations with those derived from other methods. When combined with the previously published ALEPH measurements, the resulting τ\tau lifetime is 291.2±2.0±1.2291.2 \pm 2.0 \pm 1.2 \fs

    Measurement of the tau lepton lifetime with the three-dimensional impact parameter method.

    No full text
    A new method is presented for the measurement of the mean τ\tau lepton lifetime using events in which τ\tau's are pair-produced and both τ\tau's decay to hadrons and ντ\nu_\tau. Based on the correlation between the two τ\tau's produced at a symmetric e+ee^+ e^- collider, the 3DIP method relies on the three-dimensional information from a double-sided vertex detector and on kinematic constraints for the precise measurement of the τ\tau decay angles. Using the data collected from 1992 to 1994 with the ALEPH detector at LEP, a τ\tau lifetime of 288.0±3.1±1.3288.0 \pm 3.1 \pm 1.3 \fs is obtained from the sample in which both τ\tau's decay to one charged track, and 292.8±5.6±3.0292.8 \pm 5.6 \pm 3.0 \fs from the sample in which one τ\tau decays to one prong and the other to three prongs. The results show small statistical correlations with those derived from other methods. When combined with the previously published ALEPH measurements, the resulting τ\tau lifetime is 291.2±2.0±1.2291.2 \pm 2.0 \pm 1.2 \fs

    Search for the bcb_c meson in hadronic Z decays

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    A search for the Bc meson decaying into the channels J/psi pi+ and J/psi l nu (l = e or mu) is performed in a sample of 3.9 million hadronic Z decays collected by the ALEPH detector. This search results in the observation of 0 and 2 candidates in each of these channels, respectively, while 0.44 and 0.81 background events are expected. The following 90\% confidence level upper limits are derived: Br(Z->Bc X)/Br(Z->q q )*Br(Bc->J/psi pi+) 3.6 10^-5 Br(Z->Bc X)/Br(Z->q q )*Br(Bc->J/psi l nu) 5.2 10^-5 An additional Bc->J/psi(e+e-) mu nu candidate with very low background probability, found in an independent analysis, is also described in detail

    Measurement of the tau lepton lifetime with the three-dimensional impact parameter method.

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    A new method is presented for the measurement of the mean τ\tau lepton lifetime using events in which τ\tau's are pair-produced and both τ\tau's decay to hadrons and ντ\nu_\tau. Based on the correlation between the two τ\tau's produced at a symmetric e+ee^+ e^- collider, the 3DIP method relies on the three-dimensional information from a double-sided vertex detector and on kinematic constraints for the precise measurement of the τ\tau decay angles. Using the data collected from 1992 to 1994 with the ALEPH detector at LEP, a τ\tau lifetime of 288.0±3.1±1.3288.0 \pm 3.1 \pm 1.3 \fs is obtained from the sample in which both τ\tau's decay to one charged track, and 292.8±5.6±3.0292.8 \pm 5.6 \pm 3.0 \fs from the sample in which one τ\tau decays to one prong and the other to three prongs. The results show small statistical correlations with those derived from other methods. When combined with the previously published ALEPH measurements, the resulting τ\tau lifetime is 291.2±2.0±1.2291.2 \pm 2.0 \pm 1.2 \fs
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