First Experimental Study of Photon Polarization in Radiative B[subscript s][superscript 0] Decays
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PhysRevLett.118.021801.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Alkhazov, G.
Date Issued
January 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R. et al. “First Experimental Study of Photon Polarization in Radiative B[subscript S][superscript 0] Decays.” Physical Review Letters 118, 021801 (January 2017): 1-9 © 2017 CERN for the LHCb Collaboration
Version
Final published version
Abstract
The polarization of photons produced in radiative B[subscript s][superscript 0] decays is studied for the first time. The data are recorded by the LHCb experiment in pp collisions corresponding to an integrated luminosity of 3 fb[superscript -1] at center-of-mass energies of 7 and 8 TeV. A time-dependent analysis of the B[subscript s][superscript 0]→ϕγ decay rate is conducted to determine the parameter A[superscript Δ], which is related to the ratio of right- over left-handed photon polarization amplitudes in b→sγ transitions. A value of A[superscript Δ]=-0.98[subscript -0.52][superscript +0.46][subscript -0.20][superscript +0.23] is measured. This result is consistent with the standard model prediction within 2 standard deviations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.118.021801
