Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays
An angular analysis of the decay B[subscript s][superscript 0] →K[superscript ∗0][¯ over K][superscript ∗0] is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb[superscript −1] collected by the LHCb experiment at a centre-of-mass energy √s=7 TeV. A combined angular a...
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Springer Nature
2018
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| Online Access: | http://hdl.handle.net/1721.1/116956 https://orcid.org/0000-0001-8285-3346 |
| _version_ | 1811095365503418368 |
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| author | Williams, Michael |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Williams, Michael |
| author_sort | Williams, Michael |
| collection | MIT |
| description | An angular analysis of the decay B[subscript s][superscript 0] →K[superscript ∗0][¯ over K][superscript ∗0] is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb[superscript −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 f[subscript L] = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K[subscript 0][superscript ∗] (1430) and K[subscript 0][superscript ∗] (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(B[subscript s]→ K[superscript ∗] (892)[superscript 0] [¯ over K][superscript *] (892)[superscript 0] is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f[subscript d]/f[subscript s])) × 10[superscript −6]. Keywords: CP violation, Hadron-Hadron Scattering, Polarization, B physics, Flavour Changing Neutral Currents |
| first_indexed | 2024-09-23T16:15:56Z |
| format | Article |
| id | mit-1721.1/116956 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T16:15:56Z |
| publishDate | 2018 |
| publisher | Springer Nature |
| record_format | dspace |
| spelling | mit-1721.1/1169562022-09-29T19:14:55Z Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays Williams, Michael Massachusetts Institute of Technology. Department of Physics Williams, Michael An angular analysis of the decay B[subscript s][superscript 0] →K[superscript ∗0][¯ over K][superscript ∗0] is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb[superscript −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 f[subscript L] = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K[subscript 0][superscript ∗] (1430) and K[subscript 0][superscript ∗] (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(B[subscript s]→ K[superscript ∗] (892)[superscript 0] [¯ over K][superscript *] (892)[superscript 0] is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f[subscript d]/f[subscript s])) × 10[superscript −6]. Keywords: CP violation, Hadron-Hadron Scattering, Polarization, B physics, Flavour Changing Neutral Currents National Science Foundation (U.S.) 2018-07-12T19:39:52Z 2018-07-12T19:39:52Z 2015-07 2015-05 2018-05-07T12:41:42Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 http://hdl.handle.net/1721.1/116956 The LHCb collaboration, et al. “Measurement of CP Asymmetries and Polarisation Fractions in B[superscript 0][subscript s] → K[superscript ∗0][¯ over K][superscript ∗ 0] Decays.” Journal of High Energy Physics, vol. 2015, no. 7, July 2015. © 2015 The Authors https://orcid.org/0000-0001-8285-3346 http://dx.doi.org/10.1007/JHEP07(2015)166 Journal of High Energy Physics Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Springer Nature Springer |
| spellingShingle | Williams, Michael Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays |
| title | Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays |
| title_full | Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays |
| title_fullStr | Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays |
| title_full_unstemmed | Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays |
| title_short | Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays |
| title_sort | measurement of cp asymmetries and polarisation fractions in b superscript 0 subscript s k superscript ∗0 ¯ over k superscript ∗0 decays |
| url | http://hdl.handle.net/1721.1/116956 https://orcid.org/0000-0001-8285-3346 |
| work_keys_str_mv | AT williamsmichael measurementofcpasymmetriesandpolarisationfractionsinbsuperscript0subscriptsksuperscript0overksuperscript0decays |