Strong constraints on the b → sγ photon polarisation from B0 → K*0e+e− decays

Strong constraints on the b → sγ photon polarisation from B0 → K*0e+e− decays

Dettagli Bibliografici
Parent link:	Journal of High Energy Physics Vol. 2020, iss. 12.— 2020.— [81, 25 p.]
Enti autori:	Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Инженерная школа информационных технологий и робототехники Отделение автоматизации и робототехники (ОАР)
Altri autori:	Aaij R. Roel, Beteta C. A. Carlos Abellan, Adeva B. Bernardo, Adinolfi M. Marco, Eydelman S. I. Semen Isaakovich, Kharisova A. E. Anastasiya Evgenjevna, Panshin G. L. Gennady Leonidovich
Riassunto:	Title screen An angular analysis of the B0 → K0e+e− decay is performed using a data sample corresponding to an integrated luminosity of 9 fb−1 of pp collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared (q2) interval between 0.0008 and 0.257 GeV2, where the rate is dominated by the B0 → K0γ transition with a virtual photon. The fraction of longitudinal polarisation of the K*0 meson, FL, is measured to be FL = (4.4 ± 2.6 ± 1.4)%, where the first uncertainty is statistical and the second systematic. The AReTATRe observable, which is related to the lepton forward-backward asymmetry, is measured to be AReTATRe = −0.06 ± 0.08 ± 0.02. The A(2)TAT(2) and AImTATIm transverse asymmetries, which are sensitive to the virtual photon polarisation, are found to be A(2)TAT(2) = 0.11 ± 0.10 ± 0.02 and AImTATIm = 0.02 ± 0.10 ± 0.01. The results are consistent with Standard Model predictions and provide the world's best constraint on the b → sγ photon polarisation.
Lingua:	inglese
Pubblicazione:	2020
Soggetti:	электронный ресурс труды учёных ТПУ
Accesso online:	https://doi.org/10.1007/JHEP12(2020)081
Natura:	Elettronico Capitolo di libro
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664764

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