An angular analysis of the B0→K∗0e+e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q2) interval between 0.002 and 1.120GeV2/c4. The angular observables FL and AReT which are related to the K∗0 polarisation and to the lepton forward-backward asymmetry, are measured to be FL=0.16±0.06±0.03 and AReT=0.10±0.18±0.05, where the first uncertainty is statistical and the second systematic. The angular observables A(2)T and AImT which are sensitive to the photon polarisation in this q2 range, are found to be A(2)T=−0.23±0.23±0.05 and AImT=0.14±0.22±0.05. The results are consistent with Standard Model predictions.

Angular analysis of the B 0 → K *0 e + e − decay in the low-q 2 region

SATRIANO, Celestina;
2015-01-01

Abstract

An angular analysis of the B0→K∗0e+e− decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared (q2) interval between 0.002 and 1.120GeV2/c4. The angular observables FL and AReT which are related to the K∗0 polarisation and to the lepton forward-backward asymmetry, are measured to be FL=0.16±0.06±0.03 and AReT=0.10±0.18±0.05, where the first uncertainty is statistical and the second systematic. The angular observables A(2)T and AImT which are sensitive to the photon polarisation in this q2 range, are found to be A(2)T=−0.23±0.23±0.05 and AImT=0.14±0.22±0.05. The results are consistent with Standard Model predictions.
2015
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/112740
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 82
  • ???jsp.display-item.citation.isi??? 46
social impact