Physics Commons^™

Comeback Measurement Of The Ckm Matrix Element |VCb| From B0 → D*- At Belle, E. Waheed, P. Urquijo, D. Ferlewicz, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, D.M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, I. Badhrees, P. Behera, C. Beleño, F. Bernlochner, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, Milind Purohit, Et. Al.

Faculty Publications

We present a new measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| from B⁰ → D^*-ℓ _vℓ decays, reconstructed with the full Belle data set of 711 fb⁻¹ integrated luminosity. Two form factor parametrizations, originally conceived by the Caprini-Lellouch-Neubert (CLN) and the Boyd, Grinstein and Lebed (BGL) groups, are used to extract the product F(1)η_EW||V_cb| and the decay form factors, where F(1) is the normalization factor and η_EW is a small electroweak correction. In the CLN parametrization we find F(1)η_EW||Vcb|=(35.06 ± 0.15 ± 0.56) × 10⁻³, …

Extraction Of Form Factors From A Four-Dimensional Angular Analysis B̅ →D∗ℓ−V̅ ℓ, J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, Milind Purohit, Et. Al.

Faculty Publications

An angular analysis of the decay B̅ → D ∗ ℓ − v̅ ℓ , ℓ ∈ { e , μ } , is reported using the full e ⁺e⁻ collision data set collected by the BABAR experiment at the Υ (4S) resonance. One B meson from the Υ (4S) → B B̅ decay is fully reconstructed in a hadronic decay mode, which constrains the kinematics and provides a determination of the neutrino momentum vector. The kinematics of the semileptonic decay is described by the dilepton mass squared, q² , and three …

Measurement Of The Γ*Γ* → Η' Transition Form Factor, J.P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, Milind Purohit, Et. Al.

Faculty Publications

We study the process e⁺e⁻→e⁺e⁻η′ in the double-tag mode and measure for the first time the γ^*γ^*→ η′ transition form factor Fη′ (Q ² ₁ , Q² ₂) in the momentum-transfer range 2< Q ² ₁ , Q² ₂ 60 GeV ² . The analysis is based on a data sample corresponding to an integrated luminosity of around 469     fb^{− 1} collected at the PEP-II e ⁺e ⁻ collider with the BABAR detector at center-of-mass energies near 10.6 GeV.

1; Q2 2Þ in the …

Measurement Of The Spectral Function For The Τ− → K−KSΝΤ Decay, J.P. Lees, V. Porieau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, V. B. Golubev, Milind Purohit, Et. Al.

Faculty Publications

The decay τ−→K−KSντ has been studied using 430 × 10⁶ e+e− → _τ⁺_τ⁻ events produced at a center-of-mass energy around 10.6 GeV at the PEP-II collider and studied with the BABAR detector. The mass spectrum of the K−K_S system has been measured and the spectral function has been obtained. The measured branching fraction B(_τ− → K−K_{Sντ) =}(0.739 ± 0.011(stat) ± 0.020(syst)) × 10⁻³ is found to be in agreement with earlier measurements.