Observation of B0 s – B0 s mixing and measurement of mixing frequencies using semileptonic B decays

R. Aaij; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. Anderlini; J. Anderson; P.R. Andreassen; J.E. Andrews; F. Andrianala; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; J. Van Den Brand; K. Carvalho Akiba; V. Coco; P. N.Y. David; K. De Bruyn; D. Van Eijk; C. Farinelli; M. Ferro-Luzzi; V. Heijne; T. Ketel; R. F. Koopman; A. Kozlinskiy; R. W. Lambert; J. Van Leerdam; M. Merk; I. Mous; S. Oggero; G. Raven; M. Schiller; N. Serra; B. Storaci; V. Syropoulos; J. Van Tilburg; S. Tolk; P. Tsopelas; N. Tuning; The LHCb collaboration

doi:10.1140/epjc/s10052-013-2655-8

Observation of B⁰ _s – B⁰ _s mixing and measurement of mixing frequencies using semileptonic B decays

R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. Anderlini, J. Anderson, P.R. Andreassen, J.E. AndrewsF. Andrianala, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, J. Van Den Brand, K. Carvalho Akiba, V. Coco, P. N.Y. David, K. De Bruyn, D. Van Eijk, C. Farinelli, M. Ferro-Luzzi, V. Heijne, T. Ketel, R. F. Koopman, A. Kozlinskiy, R. W. Lambert, J. Van Leerdam, M. Merk, I. Mous, S. Oggero, G. Raven, M. Schiller, N. Serra, B. Storaci, V. Syropoulos, J. Van Tilburg, S. Tolk, P. Tsopelas, N. Tuning, The LHCb collaboration

(Astro)-Particles Physics

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Abstract

The B⁰ _s and B⁰ mixing frequencies, Δm_s and Δm_d, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb⁻¹ collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8 × 10⁶ candidate events are selected of the type B⁰ _(s) → D⁻ _(s)μ⁺ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initialstate flavour and so to resolve oscillations due to mixing. We obtain Δm_s = (17.93 ± 0.22 (stat) ± 0.15 (syst)) ps⁻¹, Δm_d = (0.503 ± 0.011 (stat) ± 0.013(syst)) ps⁻¹. The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for B⁰ _s and 13.0 standard deviations for B⁰. This is the first observation of B⁰ _s mixing to be made using only semileptonic decays.

Original language	English
Article number	2655
Journal	European Physical Journal C. Particles and Fields
Volume	73
Issue number	12
DOIs	https://doi.org/10.1140/epjc/s10052-013-2655-8
Publication status	Published - 4 Dec 2013

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Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Cartelle, P. A., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., Anderlini, L., Anderson, J., Andreassen, P. R., ... The LHCb collaboration (2013). Observation of B⁰ _s – B⁰ _s mixing and measurement of mixing frequencies using semileptonic B decays. European Physical Journal C. Particles and Fields, 73(12), Article 2655. https://doi.org/10.1140/epjc/s10052-013-2655-8

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title = "Observation of B0 s – B0 s mixing and measurement of mixing frequencies using semileptonic B decays",

abstract = "The B0 s and B0 mixing frequencies, Δms and Δmd, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8 × 106 candidate events are selected of the type B0 (s) → D− (s)μ+ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initialstate flavour and so to resolve oscillations due to mixing. We obtain Δms = (17.93 ± 0.22 (stat) ± 0.15 (syst)) ps−1, Δmd = (0.503 ± 0.011 (stat) ± 0.013(syst)) ps−1. The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for B0 s and 13.0 standard deviations for B0. This is the first observation of B0 s mixing to be made using only semileptonic decays.",

author = "R. Aaij and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni 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. Anderlini and J. Anderson and P.R. Andreassen and J.E. Andrews and F. Andrianala and Appleby, {R. B.} and Gutierrez, {O. Aquines} and F. Archilli and {Van Den Brand}, J. and Akiba, {K. Carvalho} and V. Coco and David, {P. N.Y.} and {De Bruyn}, K. and {Van Eijk}, D. and C. Farinelli and M. Ferro-Luzzi and V. Heijne and T. Ketel and Koopman, {R. F.} and A. Kozlinskiy and Lambert, {R. W.} and {Van Leerdam}, J. and M. Merk and I. Mous and S. Oggero and G. Raven and M. Schiller and N. Serra and B. Storaci and V. Syropoulos and {Van Tilburg}, J. and S. Tolk and P. Tsopelas and N. Tuning and {The LHCb collaboration}",

year = "2013",

month = dec,

day = "4",

doi = "10.1140/epjc/s10052-013-2655-8",

language = "English",

volume = "73",

journal = "European Physical Journal C. Particles and Fields",

issn = "1434-6044",

publisher = "Springer New York",

number = "12",

}

Aaij, R, Adeva, B, Adinolfi, M, Adrover, C, Affolder, A, Ajaltouni, Z, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Cartelle, PA, Alves, AA, Amato, S, Amerio, S, Amhis, Y, Anderlini, L, Anderson, J, Andreassen, PR, Andrews, JE, Andrianala, F, Appleby, RB, Gutierrez, OA, Archilli, F, Van Den Brand, J, Akiba, KC, Coco, V, David, PNY, De Bruyn, K, Van Eijk, D, Farinelli, C, Ferro-Luzzi, M, Heijne, V, Ketel, T, Koopman, RF, Kozlinskiy, A, Lambert, RW, Van Leerdam, J, Merk, M, Mous, I, Oggero, S, Raven, G, Schiller, M, Serra, N, Storaci, B, Syropoulos, V, Van Tilburg, J, Tolk, S, Tsopelas, P, Tuning, N & The LHCb collaboration 2013, 'Observation of B⁰ _s – B⁰ _s mixing and measurement of mixing frequencies using semileptonic B decays', European Physical Journal C. Particles and Fields, vol. 73, no. 12, 2655. https://doi.org/10.1140/epjc/s10052-013-2655-8

TY - JOUR

T1 - Observation of B0 s – B0 s mixing and measurement of mixing frequencies using semileptonic B decays

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adrover, C.

AU - Affolder, A.

AU - Ajaltouni, Z.

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 - Anderlini, L.

AU - Anderson, J.

AU - Andreassen, P.R.

AU - Andrews, J.E.

AU - Andrianala, F.

AU - Appleby, R. B.

AU - Gutierrez, O. Aquines

AU - Archilli, F.

AU - Van Den Brand, J.

AU - Akiba, K. Carvalho

AU - Coco, V.

AU - David, P. N.Y.

AU - De Bruyn, K.

AU - Van Eijk, D.

AU - Farinelli, C.

AU - Ferro-Luzzi, M.

AU - Heijne, V.

AU - Ketel, T.

AU - Koopman, R. F.

AU - Kozlinskiy, A.

AU - Lambert, R. W.

AU - Van Leerdam, J.

AU - Merk, M.

AU - Mous, I.

AU - Oggero, S.

AU - Raven, G.

AU - Schiller, M.

AU - Serra, N.

AU - Storaci, B.

AU - Syropoulos, V.

AU - Van Tilburg, J.

AU - Tolk, S.

AU - Tsopelas, P.

AU - Tuning, N.

AU - The LHCb collaboration

PY - 2013/12/4

Y1 - 2013/12/4

N2 - The B0 s and B0 mixing frequencies, Δms and Δmd, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8 × 106 candidate events are selected of the type B0 (s) → D− (s)μ+ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initialstate flavour and so to resolve oscillations due to mixing. We obtain Δms = (17.93 ± 0.22 (stat) ± 0.15 (syst)) ps−1, Δmd = (0.503 ± 0.011 (stat) ± 0.013(syst)) ps−1. The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for B0 s and 13.0 standard deviations for B0. This is the first observation of B0 s mixing to be made using only semileptonic decays.

AB - The B0 s and B0 mixing frequencies, Δms and Δmd, are measured using a data sample corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment in pp collisions at a centre of mass energy of 7 TeV during 2011. Around 1.8 × 106 candidate events are selected of the type B0 (s) → D− (s)μ+ (+ anything), where about half are from peaking and combinatorial backgrounds. To determine the B decay times, a correction is required for the momentum carried by missing particles, which is performed using a simulation-based statistical method. Associated production of muons or mesons allows us to tag the initialstate flavour and so to resolve oscillations due to mixing. We obtain Δms = (17.93 ± 0.22 (stat) ± 0.15 (syst)) ps−1, Δmd = (0.503 ± 0.011 (stat) ± 0.013(syst)) ps−1. The hypothesis of no oscillations is rejected by the equivalent of 5.8 standard deviations for B0 s and 13.0 standard deviations for B0. This is the first observation of B0 s mixing to be made using only semileptonic decays.

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U2 - 10.1140/epjc/s10052-013-2655-8

DO - 10.1140/epjc/s10052-013-2655-8

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SN - 1434-6044

VL - 73

JO - European Physical Journal C. Particles and Fields

JF - European Physical Journal C. Particles and Fields

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