3 years ago

Measurement of the shape of the $\Lambda_b^0\to\Lambda_c^+ \mu^- \overline{\nu}$ differential decay rate.

S. Baker, S. Bachmann, L. Beaucourt, P. Alvarez Cartelle, M. Baalouch, M. Artuso, A. Beiter, K. Belous, A.A. Alves Jr, S. Ali, S. Amato, LHCb collaboration, E. Aslanides, G. Andreassi, W. Baldini, A. Badalov, L.J. Bel, A. Bay, M. Andreotti, S. Amerio, Z. Ajaltouni, A. Artamonov, R.B. Appleby, V. Bellee, I. Babuschkin, G. Auriemma, G. Alkhazov, V. Batozskaya, A. Baranov, R. Aaij, Y. Amhis, M. Baszczyk, E. Ben-Haim, F. Alessio, W. Barter, P. d'Argent, G. Bencivenni, C. Baesso, F. Archilli, M. Adinolfi, N. Beliy, L. An, A. Alfonso Albero, V. Balagura, J.J. Back, J. Albrecht, I. Bediaga, C. Barschel, I. Belyaev, N. Belloli, V. Battista, F. Baryshnikov, L. Anderlini, S. Benson, R.J. Barlow, B. Adeva, S. Beranek, J.E. Andrews, J. Beddow, J. Arnau Romeu, S. Akar, S. Barsuk, F. Bedeschi, M. Alexander

A measurement of the shape of the differential decay rate and the associated Isgur-Wise function for the decay $\Lambda_b^0\to\Lambda_c^+\mu^-\overline{\nu}$ is reported, using data corresponding to $3 fb^{-1}$ collected with the LHCb detector in proton-proton collisions. The $\Lambda_c^+\mu^-\overline{\nu}$(+ anything) final states are reconstructed through the detection of a muon and a $\Lambda_c^+$ baryon decaying into $pK^-\pi^+$, and the decays $\Lambda_b^0\to\Lambda_c^+\pi^+\pi^-\mu^-\overline{\nu}$ are used to determine contributions from $\Lambda_b^0\to \Lambda_c^{\star+}\mu ^-\bar{\nu}$ decays. The measured dependence of the differential decay rate upon the squared four-momentum transfer between the heavy baryons, $q^2$, is compared with expectations from heavy-quark effective theory and from unquenched lattice QCD predictions.

Publisher URL: http://arxiv.org/abs/1709.01920

DOI: arXiv:1709.01920v3

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