Observation of the suppressed decay Λb        0 → pπ − μ + μ −

R. Aaij; B. Adeva; M. Adinolfi; 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; G. Andreassi; M. Andreotti; J. E. Andrews; R. B. Appleby; F. Archilli; P. d’Argent; J. Arnau Romeu; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; I. Babuschkin; S. Bachmann; J. J. Back; A. Badalov; C. Baesso; S. Baker; W. Baldini; R. J. Barlow; C. Barschel; S. Bifani; G. Chatzikonstantinidis; N. Farley; P. Griffith; C. Lazzeroni; A. Mazurov; J. McCarthy; A. Sergi; N. K. Watson; M. P. Williams; T. Williams; K. A. Zarebski; LHCb Collaboration

doi:10.1007/JHEP04(2017)029

Observation of the suppressed decay Λ_b ⁰ → pπ ⁻ μ ⁺ μ ⁻

R. Aaij, B. Adeva, M. Adinolfi, 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, G. Andreassi, M. Andreotti, J. E. AndrewsR. B. Appleby, F. Archilli, P. d’Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, W. Baldini, R. J. Barlow, C. Barschel, S. Bifani, G. Chatzikonstantinidis, N. Farley, P. Griffith, C. Lazzeroni, A. Mazurov, J. McCarthy, A. Sergi, N. K. Watson, M. P. Williams, T. Williams, K. A. Zarebski, LHCb Collaboration

Physics and Astronomy

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Abstract

The suppressed decay Λ_b ⁰ → pπ⁻μ⁺μ⁻, excluding the J/ψ and ψ(2S) → μ⁺μ⁻ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb⁻¹ collected with the LHCb experiment. The Λ_b ⁰ → pπ⁻μ⁺μ⁻ branching fraction is measured relative to the Λ_b ⁰ → J/ψ(→μ⁺μ⁻)pπ⁻ branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.[Figure not available: see fulltext.]

Original language	English
Article number	29
Journal	Journal of High Energy Physics
Volume	2017
Issue number	4
DOIs	https://doi.org/10.1007/JHEP04(2017)029
Publication status	Published - 6 Apr 2017

Keywords

B physics
Branching fraction
Flavour Changing Neutral Currents
Hadron-Hadron scattering (experiments)
Rare decay

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1007/JHEP04(2017)029Licence: Creative Commons: Attribution (CC BY)

Aaij_et_al_Observations_of_the_supressed_Journal_of_High_Energy_Physics_2017
Published in Journal of High Energy Physics on 06/04/2017 DOI: 10.1007/JHEP04(2017)029
Final published version, 666 KBLicence: Creative Commons: Attribution (CC BY)

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Cite this

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., ... LHCb Collaboration (2017). Observation of the suppressed decay Λ_b ⁰ → pπ ⁻ μ ⁺ μ ⁻. Journal of High Energy Physics, 2017(4), Article 29. https://doi.org/10.1007/JHEP04(2017)029

@article{9f31acb6511142628353dbf1d78623a9,

title = "Observation of the suppressed decay Λb 0 → pπ − μ + μ −",

abstract = "The suppressed decay Λb 0 → pπ−μ+μ−, excluding the J/ψ and ψ(2S) → μ+μ− resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The Λb 0 → pπ−μ+μ− branching fraction is measured relative to the Λb 0 → J/ψ(→μ+μ−)pπ− branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.[Figure not available: see fulltext.]",

keywords = "B physics, Branching fraction, Flavour Changing Neutral Currents, Hadron-Hadron scattering (experiments), Rare decay",

author = "R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. d{\textquoteright}Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and S. Baker and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Bifani and G. Chatzikonstantinidis and N. Farley and P. Griffith and C. Lazzeroni and A. Mazurov and J. McCarthy and A. Sergi and Watson, {N. K.} and Williams, {M. P.} and T. Williams and Zarebski, {K. A.} and {LHCb Collaboration}",

year = "2017",

month = apr,

day = "6",

doi = "10.1007/JHEP04(2017)029",

language = "English",

volume = "2017",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

number = "4",

}

Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d’Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Babuschkin, I, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baker, S, Baldini, W, Barlow, RJ, Barschel, C, Bifani, S, Chatzikonstantinidis, G, Farley, N, Griffith, P, Lazzeroni, C, Mazurov, A, McCarthy, J, Sergi, A, Watson, NK, Williams, MP, Williams, T, Zarebski, KA & LHCb Collaboration 2017, 'Observation of the suppressed decay Λ_b ⁰ → pπ ⁻ μ ⁺ μ ⁻', Journal of High Energy Physics, vol. 2017, no. 4, 29. https://doi.org/10.1007/JHEP04(2017)029

TY - JOUR

T1 - Observation of the suppressed decay Λb 0 → pπ − μ + μ −

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d’Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baker, S.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Bifani, S.

AU - Chatzikonstantinidis, G.

AU - Farley, N.

AU - Griffith, P.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Sergi, A.

AU - Watson, N. K.

AU - Williams, M. P.

AU - Williams, T.

AU - Zarebski, K. A.

AU - LHCb Collaboration

PY - 2017/4/6

Y1 - 2017/4/6

N2 - The suppressed decay Λb 0 → pπ−μ+μ−, excluding the J/ψ and ψ(2S) → μ+μ− resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The Λb 0 → pπ−μ+μ− branching fraction is measured relative to the Λb 0 → J/ψ(→μ+μ−)pπ− branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.[Figure not available: see fulltext.]

AB - The suppressed decay Λb 0 → pπ−μ+μ−, excluding the J/ψ and ψ(2S) → μ+μ− resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The Λb 0 → pπ−μ+μ− branching fraction is measured relative to the Λb 0 → J/ψ(→μ+μ−)pπ− branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.[Figure not available: see fulltext.]

KW - B physics

KW - Branching fraction

KW - Flavour Changing Neutral Currents

KW - Hadron-Hadron scattering (experiments)

KW - Rare decay

UR - http://www.scopus.com/inward/record.url?scp=85017419929&partnerID=8YFLogxK

U2 - 10.1007/JHEP04(2017)029

DO - 10.1007/JHEP04(2017)029

M3 - Article

AN - SCOPUS:85017419929

SN - 1126-6708

VL - 2017

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 4

M1 - 29

ER -

Observation of the suppressed decay Λb 0 → pπ − μ + μ −