# First experimental study of photon polarization in radiative $B^0_s$ decays

LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). First experimental study of photon polarization in radiative $B^0_s$ decays. Physical Review Letters, 118(2):021801.

## Abstract

The polarization of photons produced in radiative $B^0_s$ 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$^{−1}$ at center-of-mass energies of 7 and 8 TeV. A time-dependent analysis of the $B^0_s \to \phi\gamma$ decay rate is conducted to determine the parameter $\mathcal{A}^{\Delta}$, which is related to the ratio of right- over left-handed photon polarization amplitudes in $b \to s\gamma$ transitions. A value of $\mathcal{A}^{\Delta} = −0.98^{+0.46^{+0.23}}_{−0.52_{−0.20}}$ is measured. This result is consistent with the standard model prediction within 2 standard deviations.

## Abstract

The polarization of photons produced in radiative $B^0_s$ 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$^{−1}$ at center-of-mass energies of 7 and 8 TeV. A time-dependent analysis of the $B^0_s \to \phi\gamma$ decay rate is conducted to determine the parameter $\mathcal{A}^{\Delta}$, which is related to the ratio of right- over left-handed photon polarization amplitudes in $b \to s\gamma$ transitions. A value of $\mathcal{A}^{\Delta} = −0.98^{+0.46^{+0.23}}_{−0.52_{−0.20}}$ is measured. This result is consistent with the standard model prediction within 2 standard deviations.

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