Study of the kinematic dependences of Λb0 production in pp collisions and a measurement of the Λb0  → Λc                        + π− branching fraction

LHCb Collaboration; R. Aaij; B. Adeva; M. Adinolfi; 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. 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; S. Bachmann; J. J. Back; A. Badalov; V. Balagura; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; W. Barter; V. Batozskaya; S. Bifani; P. Griffith; P. Ilten; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. McCarthy; C. J. Parkinson; L. Pescatore; D. Popov; N. K. Watson

doi:10.1007/JHEP08(2014)143

Study of the kinematic dependences of Λ_b⁰ production in pp collisions and a measurement of the Λ_b⁰ → Λ_c ⁺ π⁻ branching fraction

LHCb Collaboration, R. Aaij, B. Adeva, M. Adinolfi, 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. An, L. Anderlini, J. Anderson, R. AndreassenM. 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, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, S. Bifani, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

Physics and Astronomy

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Abstract

The kinematic dependences of the relative production rates, fΛ⁰_b /f_d, of Λ⁰_b baryons and B⁰ mesons are measured using Λ⁰_b → Λ_c⁺ π⁻ and B^-0 → D⁺π⁻ decays. The measurements use proton-proton collision data, corresponding to an integrated luminosity of 1 fb⁻¹ at a centre-of-mass energy of 7 TeV, recorded in the forward region with the LHCb experiment. The relative production rates are observed to depend on the transverse momentum, p_T, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5 < p_T < 40 GeV/c and 2 < η < 5. Using a previous LHCb measurement of fΛ⁰_b /f_d in semileptonic decays, the branching fraction B(Λ⁰_b → Λ⁺_c π⁻) = (4.30±0.03^+0.12_−0.11±0.26± 0.21) ×10⁻³ is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of fΛ⁰_b / f_d and the fourth is due to the b B^-0 → D⁺π⁻ branching fraction. This is the most precise measurement of a Λ_b⁰ branching fraction to date.

Original language	English
Article number	143
Number of pages	19
Journal	Journal of High Energy Physics
Volume	2014
Issue number	8
DOIs	https://doi.org/10.1007/JHEP08(2014)143
Publication status	Published - 26 Aug 2014

Keywords

B physics
Branching fraction
Hadron-Hadron Scattering
Heavy quark production
Particle and resonance production

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Cite this

LHCb Collaboration, Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., 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., Anderson, J., ... Watson, N. K. (2014). Study of the kinematic dependences of Λ_b⁰ production in pp collisions and a measurement of the Λ_b⁰ → Λ_c ⁺ π⁻ branching fraction. Journal of High Energy Physics, 2014(8), Article 143. https://doi.org/10.1007/JHEP08(2014)143

@article{6ee4b669b67249b0b868c4e0df0cb8ae,

title = "Study of the kinematic dependences of Λb0 production in pp collisions and a measurement of the Λb0 → Λc + π− branching fraction",

abstract = "The kinematic dependences of the relative production rates, fΛ0b /fd, of Λ0b baryons and B0 mesons are measured using Λ0b → Λc+ π− and B-0 → D+π− decays. The measurements use proton-proton collision data, corresponding to an integrated luminosity of 1 fb−1 at a centre-of-mass energy of 7 TeV, recorded in the forward region with the LHCb experiment. The relative production rates are observed to depend on the transverse momentum, pT, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5 < pT < 40 GeV/c and 2 < η < 5. Using a previous LHCb measurement of fΛ0b /fd in semileptonic decays, the branching fraction B(Λ0b → Λ+c π−) = (4.30±0.03+0.12−0.11±0.26± 0.21) ×10−3 is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of fΛ0b / fd and the fourth is due to the b B-0 → D+π− branching fraction. This is the most precise measurement of a Λb0 branching fraction to date.",

keywords = "B physics, Branching fraction, Hadron-Hadron Scattering, Heavy quark production, Particle and resonance production",

author = "{LHCb Collaboration} and R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni 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 J. Anderson and R. Andreassen and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and {Aquines Gutierrez}, O. 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 V. Balagura and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and V. Batozskaya and S. Bifani and P. Griffith and P. Ilten and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. McCarthy and Parkinson, {C. J.} and L. Pescatore and D. Popov and Watson, {N. K.}",

year = "2014",

month = aug,

day = "26",

doi = "10.1007/JHEP08(2014)143",

language = "English",

volume = "2014",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

number = "8",

}

LHCb Collaboration, Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, 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, Anderson, J, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Balagura, V, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Batozskaya, V, Bifani, S, Griffith, P, Ilten, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L, Popov, D & Watson, NK 2014, 'Study of the kinematic dependences of Λ_b⁰ production in pp collisions and a measurement of the Λ_b⁰ → Λ_c ⁺ π⁻ branching fraction', Journal of High Energy Physics, vol. 2014, no. 8, 143. https://doi.org/10.1007/JHEP08(2014)143

TY - JOUR

T1 - Study of the kinematic dependences of Λb0 production in pp collisions and a measurement of the Λb0 → Λc + π− branching fraction

AU - LHCb Collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

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 - Anderson, J.

AU - Andreassen, R.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

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 - Balagura, V.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Batozskaya, V.

AU - Bifani, S.

AU - Griffith, P.

AU - Ilten, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Parkinson, C. J.

AU - Pescatore, L.

AU - Popov, D.

AU - Watson, N. K.

PY - 2014/8/26

Y1 - 2014/8/26

N2 - The kinematic dependences of the relative production rates, fΛ0b /fd, of Λ0b baryons and B0 mesons are measured using Λ0b → Λc+ π− and B-0 → D+π− decays. The measurements use proton-proton collision data, corresponding to an integrated luminosity of 1 fb−1 at a centre-of-mass energy of 7 TeV, recorded in the forward region with the LHCb experiment. The relative production rates are observed to depend on the transverse momentum, pT, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5 < pT < 40 GeV/c and 2 < η < 5. Using a previous LHCb measurement of fΛ0b /fd in semileptonic decays, the branching fraction B(Λ0b → Λ+c π−) = (4.30±0.03+0.12−0.11±0.26± 0.21) ×10−3 is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of fΛ0b / fd and the fourth is due to the b B-0 → D+π− branching fraction. This is the most precise measurement of a Λb0 branching fraction to date.

AB - The kinematic dependences of the relative production rates, fΛ0b /fd, of Λ0b baryons and B0 mesons are measured using Λ0b → Λc+ π− and B-0 → D+π− decays. The measurements use proton-proton collision data, corresponding to an integrated luminosity of 1 fb−1 at a centre-of-mass energy of 7 TeV, recorded in the forward region with the LHCb experiment. The relative production rates are observed to depend on the transverse momentum, pT, and pseudorapidity, η, of the beauty hadron, in the studied kinematic region 1.5 < pT < 40 GeV/c and 2 < η < 5. Using a previous LHCb measurement of fΛ0b /fd in semileptonic decays, the branching fraction B(Λ0b → Λ+c π−) = (4.30±0.03+0.12−0.11±0.26± 0.21) ×10−3 is obtained, where the first uncertainty is statistical, the second is systematic, the third is from the previous LHCb measurement of fΛ0b / fd and the fourth is due to the b B-0 → D+π− branching fraction. This is the most precise measurement of a Λb0 branching fraction to date.

KW - B physics

KW - Branching fraction

KW - Hadron-Hadron Scattering

KW - Heavy quark production

KW - Particle and resonance production

UR - http://www.scopus.com/inward/record.url?scp=84975095484&partnerID=8YFLogxK

U2 - 10.1007/JHEP08(2014)143

DO - 10.1007/JHEP08(2014)143

M3 - Article

AN - SCOPUS:84975095484

SN - 1126-6708

VL - 2014

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 8

M1 - 143

ER -

Study of the kinematic dependences of Λb0 production in pp collisions and a measurement of the Λb0 → Λc + π− branching fraction