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Abstract / Description of output
The photon polarization in πβπ β’πΎ transitions is measured for the first time in radiative π -baryon decays exploiting the unique spin structure of Ξ0
πβΞβ’πΎ decays. A data sample corresponding to an integrated luminosity of 6ββfbβ1 collected by the LHCb experiment in πβ’π collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be πΌπΎ=0.8β’2+0.17+0.04
β0.26β0.13, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in π -meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with πΆβ’π symmetry.
πβΞβ’πΎ decays. A data sample corresponding to an integrated luminosity of 6ββfbβ1 collected by the LHCb experiment in πβ’π collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be πΌπΎ=0.8β’2+0.17+0.04
β0.26β0.13, where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in π -meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with πΆβ’π symmetry.
| Original language | English |
|---|---|
| Article number | L051104 |
| Pages (from-to) | 1-11 |
| Number of pages | 11 |
| Journal | Physical Review D |
| Volume | 105 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 23 Mar 2022 |