This paper presents an analysis of the Λ0b → J/ψΛ angular distribution andthe transverse production polarisation of Λ0bbaryons in proton-proton collisions at centreof-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. Thepolarisation is determined in a fiducial region of Λ0btransverse momentum and pseudorapidity of 1 < pT < 20 GeV/c and 2 < η < 5, respectively. The data are consistent withΛ0bbaryons being produced unpolarised in this region. The parity-violating asymmetryparameter of the Λ → pπ− decay is also determined from the data and its value is foundto be consistent with a recent measurement by the BES III collaboration.

Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amhis, Y., An, L., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2020:6(2020). [10.1007/JHEP06(2020)110]

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

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
2020

Abstract

This paper presents an analysis of the Λ0b → J/ψΛ angular distribution andthe transverse production polarisation of Λ0bbaryons in proton-proton collisions at centreof-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. Thepolarisation is determined in a fiducial region of Λ0btransverse momentum and pseudorapidity of 1 < pT < 20 GeV/c and 2 < η < 5, respectively. The data are consistent withΛ0bbaryons being produced unpolarised in this region. The parity-violating asymmetryparameter of the Λ → pπ− decay is also determined from the data and its value is foundto be consistent with a recent measurement by the BES III collaboration.
2020
B physics, Flavor physics, Hadron-Hadron scattering (experiments), Heavy quark production, Polarization
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the Λb0 → J/ψΛ angular distribution and the Λb0 polarisation in pp collisions / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amhis, Y., An, L., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2020:6(2020). [10.1007/JHEP06(2020)110]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1580264
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