Angular analysis of the B[superscript 0] → K[superscript *0]e[superscript +]e[superscript −] decay in the low-q[superscript 2] region
Author(s)Counts, Ian Thomas Hunt; Ilten, Philip James; Williams, Michael
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An angular analysis of the B[superscript 0] → K[superscript *0]e[superscript +]e[superscript −] decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb[superscript −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 (q[superscript 2]) interval between 0.002 and 1.120 GeV[superscript 2]/c[superscript 4]. The angular observables F [subscript L] and A [Re over T] which are related to the K[superscript *0] polarisation and to the lepton forward-backward asymmetry, are measured to be F [subscript L] = 0.16 ± 0.06 ± 0.03 and A [Re over T] = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables A [(2) over T] and A [Im over T] which are sensitive to the photon polarisation in this q[superscript 2] range, are found to be A [(2) over T] = − 0.23 ± 0.23 ± 0.05 and A [Im over T] = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal of High Energy Physics
Aaij, R., B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, et al. “Angular Analysis of the B[superscript 0] → K[superscript *0]e[superscript +]e[superscript −] Decay in the Low-q[superscript 2] Region.” J. High Energ. Phys. 2015, no. 4 (April 2015). © 2015 CERN, for the benefit of the LHCb Collaboration
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