Observation of the Λ0b → J/ψpπ− decay

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; R. Andreassen; M. Andreotti; J. E. Andrews; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; A. Băbeanu; S. Bachmann; J. J. Back; A. Badalov; V. Balagura; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; W. Barter; S. Bifani; N. Farley; P. Griffith; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. Mccarthy; C. J. Parkinson; L. Pescatore; N. K. Watson

doi:10.1007/JHEP07(2014)103

Observation of the Λ⁰_b → J/ψpπ⁻ decay

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. AndersonR. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, A. Băbeanu, S. Bachmann, J. J. Back, A. Badalov, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, S. Bifani, N. Farley, P. Griffith, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. Mccarthy, C. J. Parkinson, L. Pescatore, N. K. Watson

Physics and Astronomy

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Abstract

The first observation of the Cabibbo-suppressed decay Λ⁰_b → J/ψpπ⁻ is reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding
to an integrated luminosity of 3 fb⁻¹. A prominent signal is observed and the branching
fraction relative to the decay mode Λ⁰_b → J/ψpK⁻ is determined to be
B(Λ⁰_b → J/ψpπ⁻) / B(Λ⁰_b → J/ψpK⁻)
= 0.0824 ± 0.0025 (stat) ± 0.0042 (syst).
A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be
A_CP (Λ⁰_b → J/ψpπ⁻) − A_CP (Λ⁰_b → J/ψpK⁻) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.

Original language	English
Article number	103
Number of pages	18
Journal	Journal of High Energy Physics
Volume	2014
Issue number	7
DOIs	https://doi.org/10.1007/JHEP07(2014)103
Publication status	Published - 22 Jul 2014

Keywords

B physics
CP violation
Branching fraction
Flavor physics
Hadron-Hadron Scattering

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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. (2014). Observation of the Λ⁰_b → J/ψpπ⁻ decay. Journal of High Energy Physics, 2014(7), Article 103. https://doi.org/10.1007/JHEP07(2014)103

@article{11ef02cdb2184409b83913d8e6d621b4,

title = "Observation of the Λ0b → J/ψpπ− decay",

abstract = "The first observation of the Cabibbo-suppressed decay Λ0b → J/ψpπ− is reported using a data sample of proton-proton collisions at 7 and 8 TeV, correspondingto an integrated luminosity of 3 fb−1. A prominent signal is observed and the branchingfraction relative to the decay mode Λ0b → J/ψpK− is determined to beB(Λ0b → J/ψpπ−) / B(Λ0b → J/ψpK−)= 0.0824 ± 0.0025 (stat) ± 0.0042 (syst). A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to beACP (Λ0b → J/ψpπ−) − ACP (Λ0b → J/ψpK−) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.",

keywords = "B physics, CP violation, Branching fraction, Flavor physics, Hadron-Hadron Scattering",

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 R. Andreassen 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 A. B{\u a}beanu and S. Bachmann and Back, {J. J.} and A. Badalov and V. Balagura and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and S. Bifani and N. Farley and P. Griffith and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. Mccarthy and Parkinson, {C. J.} and L. Pescatore and Watson, {N. K.}",

year = "2014",

month = jul,

day = "22",

doi = "10.1007/JHEP07(2014)103",

language = "English",

volume = "2014",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

number = "7",

}

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, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Gutierrez, OA, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Băbeanu, A, Bachmann, S, Back, JJ, Badalov, A, Balagura, V, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Bifani, S, Farley, N, Griffith, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, Mccarthy, J, Parkinson, CJ, Pescatore, L & Watson, NK 2014, 'Observation of the Λ⁰_b → J/ψpπ⁻ decay', Journal of High Energy Physics, vol. 2014, no. 7, 103. https://doi.org/10.1007/JHEP07(2014)103

TY - JOUR

T1 - Observation of the Λ0b → J/ψpπ− decay

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 - Andreassen, R.

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 - Băbeanu, A.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Balagura, V.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Bifani, S.

AU - Farley, N.

AU - Griffith, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - Mccarthy, J.

AU - Parkinson, C. J.

AU - Pescatore, L.

AU - Watson, N. K.

PY - 2014/7/22

Y1 - 2014/7/22

N2 - The first observation of the Cabibbo-suppressed decay Λ0b → J/ψpπ− is reported using a data sample of proton-proton collisions at 7 and 8 TeV, correspondingto an integrated luminosity of 3 fb−1. A prominent signal is observed and the branchingfraction relative to the decay mode Λ0b → J/ψpK− is determined to beB(Λ0b → J/ψpπ−) / B(Λ0b → J/ψpK−)= 0.0824 ± 0.0025 (stat) ± 0.0042 (syst). A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to beACP (Λ0b → J/ψpπ−) − ACP (Λ0b → J/ψpK−) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.

AB - The first observation of the Cabibbo-suppressed decay Λ0b → J/ψpπ− is reported using a data sample of proton-proton collisions at 7 and 8 TeV, correspondingto an integrated luminosity of 3 fb−1. A prominent signal is observed and the branchingfraction relative to the decay mode Λ0b → J/ψpK− is determined to beB(Λ0b → J/ψpπ−) / B(Λ0b → J/ψpK−)= 0.0824 ± 0.0025 (stat) ± 0.0042 (syst). A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to beACP (Λ0b → J/ψpπ−) − ACP (Λ0b → J/ψpK−) = (+5.7 ± 2.4 (stat) ± 1.2 (syst))%, which is compatible with CP symmetry at the 2.2σ level.

KW - B physics

KW - CP violation

KW - Branching fraction

KW - Flavor physics

KW - Hadron-Hadron Scattering

UR - http://link.springer.com/10.1007/JHEP07(2014)103

U2 - 10.1007/JHEP07(2014)103

DO - 10.1007/JHEP07(2014)103

M3 - Article

SN - 1126-6708

VL - 2014

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 7

M1 - 103

ER -

Observation of the Λ0b → J/ψpπ− decay

Abstract

Keywords

Access to Document

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Projects

PPGP Capital Equipment Call

ATLAS - UK Tracker Upgrade

Birmimgham Experimental Particle Physics Consolidated Grant

Wakeham Efficiency Saving PP

Experimental Particle Physics 2009-2014

Experimental Particle Physics 2006-2011

Cite this

Observation of the Λ⁰_b → J/ψpπ⁻ decay