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https://hdl.handle.net/2445/185723| Title: | Measurement of CP asymmetries and polarisation fractions in B-s(0) -> K*(0)(K)over-bar*(0) decays |
| Author: | Casanova Mohr, R. Garrido Beltrán, Lluís Gascón Fora, David Graciani Diaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, V. Ruiz, Hugo LHCb Collaboration |
| Keywords: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
| Issue Date: | 30-Jul-2015 |
| Publisher: | Springer Verlag |
| Abstract: | An angular analysis of the decay B0 s → K∗0K∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment at a centre-of-mass energy √ s = 7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction fL = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the B0 s → K∗ (892)0K∗ (892)0 decay. A large scalar contribution from the K∗ 0 (1430) and K∗ 0 (800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction B(B0 s → K∗ (892)0K∗ (892)0 ) is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (fd/fs)) × 10−6 . |
| Note: | Reproducció del document publicat a: https://doi.org/10.1007/JHEP07(2015)166 |
| It is part of: | Journal of High Energy Physics, 2015, vol. 2015, num. 166, p. 1-30 |
| URI: | https://hdl.handle.net/2445/185723 |
| Related resource: | https://doi.org/10.1007/JHEP07(2015)166 |
| ISSN: | 1126-6708 |
| Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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