Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

LHCb Collaboration

doi:10.1007/JHEP06(2020)110

Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

LHCb Collaboration

Physics and Astronomy

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Abstract

This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb⁻¹, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < p_T< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ⁻ decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]

Original language	English
Article number	110
Journal	Journal of High Energy Physics
Volume	2020
DOIs	https://doi.org/10.1007/JHEP06(2020)110
Publication status	Published - 17 Jun 2020

Keywords

B physics
Flavor physics
Hadron-Hadron scattering (experiments)
Heavy quark production
Polarization

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1007/JHEP06(2020)110Licence: Creative Commons: Attribution (CC BY)

AaijR2020Measurement
The LHCb collaboration., Aaij, R., Abellán Beteta, C. et al. Measurement of the Λ0b→ J/ψΛ angular distribution and the Λ0b polarisation in pp collisions. J. High Energ. Phys. 2020, 110 (2020). https://doi.org/10.1007/JHEP06(2020)110
Final published version, 1.26 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

@article{ffa91a73a4aa442ebf892b937d7c984f,

title = "Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions",

abstract = "This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ− decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]",

keywords = "B physics, Flavor physics, Hadron-Hadron scattering (experiments), Heavy quark production, Polarization",

author = "{LHCb Collaboration} and R. Aaij and {Abell{\'a}n Beteta}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and A. Andreianov and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, {J. J.} and S. Baker and V. Balagura and W. Baldini and {Baptista Leite}, J. and S. Bifani and R. Calladine and G. Chatzikonstantinidis and N. Cooke and N. Farley and P. Griffith and P. Ilten and J. Plews and D. Popov and A. Sergi and Slater, {M. W.} and Watson, {N. K.} and Zarebski, {K. A.}",

year = "2020",

month = jun,

day = "17",

doi = "10.1007/JHEP06(2020)110",

language = "English",

volume = "2020",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

}

TY - JOUR

T1 - Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baptista Leite, J.

AU - Bifani, S.

AU - Calladine, R.

AU - Chatzikonstantinidis, G.

AU - Cooke, N.

AU - Farley, N.

AU - Griffith, P.

AU - Ilten, P.

AU - Plews, J.

AU - Popov, D.

AU - Sergi, A.

AU - Slater, M. W.

AU - Watson, N. K.

AU - Zarebski, K. A.

PY - 2020/6/17

Y1 - 2020/6/17

N2 - This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ− decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]

AB - This paper presents an analysis of the Λb0→ J/ψΛ angular distribution and the transverse production polarisation of Λb0 baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The measurements are performed using data corresponding to an integrated luminosity of 4.9 fb−1, collected with the LHCb experiment. The polarisation is determined in a fiducial region of Λb0 transverse momentum and pseudorapidity of 1 < pT< 20 GeV/c and 2 < η < 5, respectively. The data are consistent with Λb0 baryons being produced unpolarised in this region. The parity-violating asymmetry parameter of the Λ → pπ− decay is also determined from the data and its value is found to be consistent with a recent measurement by the BES III collaboration. [Figure not available: see fulltext.]

KW - B physics

KW - Flavor physics

KW - Hadron-Hadron scattering (experiments)

KW - Heavy quark production

KW - Polarization

UR - http://www.scopus.com/inward/record.url?scp=85087042119&partnerID=8YFLogxK

U2 - 10.1007/JHEP06(2020)110

DO - 10.1007/JHEP06(2020)110

M3 - Article

AN - SCOPUS:85087042119

SN - 1126-6708

VL - 2020

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

M1 - 110

ER -

Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions

Abstract

Keywords

ASJC Scopus subject areas

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