Determination of the quark coupling strength /Vub/ using baryonic decays

LHCb Collaboration; R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; J. Anderson; M. Andreotti; J. E. Andrews; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; S. Bachmann; J. J. Back; A. Badalov; C. Baesso; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; W. Barter; V. Batozskaya; V. Battista; S. Bifani; N. Farley; P. Ilten; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. McCarthy; L. Pescatore; D. Popov; N. K. Watson

doi:10.1038/nphys3415

Determination of the quark coupling strength /V_ub/ using baryonic decays

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonM. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, S. Bifani, N. Farley, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, D. Popov, N. K. Watson

Physics and Astronomy

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Abstract

In the Standard Model of particle physics, the strength of the couplings of the b quark to the u and c quarks, /V_ub/ and /V_cb/, are governed by the coupling of the quarks to the Higgs boson. Using data from the LHCb experiment at the Large Hadron Collider, the probability for the Λ_b⁰ baryon to decay into the pμ^-v^-_μ final state relative to the Λ_c⁺μ^-v^-_μ final state is measured. Combined with theoretical calculations of the strong interaction and a previously measured value of /V_cb/, the first /V_ub/ measurement to use a baryonic decay is performed. This measurement is consistent with previous determinations of /V_ub/ using B meson decays to specific final states and confirms the existing incompatibility with those using an inclusive sample of final states.

Original language	English
Pages (from-to)	743-747
Number of pages	5
Journal	Nature Physics
Volume	11
Issue number	9
Early online date	27 Jul 2015
DOIs	https://doi.org/10.1038/nphys3415
Publication status	Published - Sept 2015

ASJC Scopus subject areas

Physics and Astronomy(all)

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Cite this

LHCb Collaboration, Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Cartelle, P. A., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., ... Watson, N. K. (2015). Determination of the quark coupling strength /V_ub/ using baryonic decays. Nature Physics, 11(9), 743-747. Advance online publication. https://doi.org/10.1038/nphys3415

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title = "Determination of the quark coupling strength /Vub/ using baryonic decays",

abstract = "In the Standard Model of particle physics, the strength of the couplings of the b quark to the u and c quarks, /Vub/ and /Vcb/, are governed by the coupling of the quarks to the Higgs boson. Using data from the LHCb experiment at the Large Hadron Collider, the probability for the Λb0 baryon to decay into the pμ-v-μ final state relative to the Λc+μ-v-μ final state is measured. Combined with theoretical calculations of the strong interaction and a previously measured value of /Vcb/, the first /Vub/ measurement to use a baryonic decay is performed. This measurement is consistent with previous determinations of /Vub/ using B meson decays to specific final states and confirms the existing incompatibility with those using an inclusive sample of final states.",

author = "{LHCb Collaboration} and R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and Cartelle, {P. Alvarez} and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and Gutierrez, {O. Aquines} and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and V. Batozskaya and V. Battista and S. Bifani and N. Farley and P. Ilten and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. McCarthy and L. Pescatore and D. Popov and Watson, {N. K.}",

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LHCb Collaboration, Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Cartelle, PA, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreotti, M, Andrews, JE, Appleby, RB, Gutierrez, OA, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Batozskaya, V, Battista, V, Bifani, S, Farley, N, Ilten, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Pescatore, L, Popov, D & Watson, NK 2015, 'Determination of the quark coupling strength /V_ub/ using baryonic decays', Nature Physics, vol. 11, no. 9, pp. 743-747. https://doi.org/10.1038/nphys3415

TY - JOUR

T1 - Determination of the quark coupling strength /Vub/ using baryonic decays

AU - LHCb Collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Cartelle, P. Alvarez

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Anderson, J.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Gutierrez, O. Aquines

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Batozskaya, V.

AU - Battista, V.

AU - Bifani, S.

AU - Farley, N.

AU - Ilten, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Pescatore, L.

AU - Popov, D.

AU - Watson, N. K.

PY - 2015/9

Y1 - 2015/9

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AB - In the Standard Model of particle physics, the strength of the couplings of the b quark to the u and c quarks, /Vub/ and /Vcb/, are governed by the coupling of the quarks to the Higgs boson. Using data from the LHCb experiment at the Large Hadron Collider, the probability for the Λb0 baryon to decay into the pμ-v-μ final state relative to the Λc+μ-v-μ final state is measured. Combined with theoretical calculations of the strong interaction and a previously measured value of /Vcb/, the first /Vub/ measurement to use a baryonic decay is performed. This measurement is consistent with previous determinations of /Vub/ using B meson decays to specific final states and confirms the existing incompatibility with those using an inclusive sample of final states.

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DO - 10.1038/nphys3415

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SN - 1745-2473

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JO - Nature Physics

JF - Nature Physics

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