Angular analysis of B0→D∗−D∗+s with D∗+s→D+sγ decays; Journal of High Energy Physics; Vol. 2021, iss. 6
| Parent link: | Journal of High Energy Physics Vol. 2021, iss. 6.— 2021.— [177, 29 p.] |
|---|---|
| Collectivités auteurs: | , |
| Autres auteurs: | , , , , |
| Résumé: | Title screen The first full angular analysis of the B0→D∗−D∗+s decay is performed using 6 fb−1 of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The D∗+s→D+sγ and D*− → D¯0π− vector meson decays are used with the subsequent D+s → K+K−π+ and D¯¯0 → K+π− decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 0.578 ± 0.010 ± 0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [ℬ(B0→D∗−D∗+s) × ℬ(D∗+s→D+sγ)]/ℬ(B0 → D*−D+s) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed Bs → D*−D+s decay is made with a significance of seven standard deviations. The branching fraction ratio ℬ(Bs → D*−D+s)/ℬ(B0 → D*−D+s) is measured to be 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions. |
| Langue: | anglais |
| Publié: |
2021
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| Sujets: | |
| Accès en ligne: | http://earchive.tpu.ru/handle/11683/72777 https://doi.org/10.1007/JHEP06(2021)177 |
| Format: | Électronique Chapitre de livre |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666695 |
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| 200 | 1 | |a Angular analysis of B0→D∗−D∗+s with D∗+s→D+sγ decays |f R. Aaij, C. A. Beteta, S. I. Eydelman [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 35 tit.] | ||
| 330 | |a The first full angular analysis of the B0→D∗−D∗+s decay is performed using 6 fb−1 of pp collision data collected with the LHCb experiment at a centre-of-mass energy of 13 TeV. The D∗+s→D+sγ and D*− → D¯0π− vector meson decays are used with the subsequent D+s → K+K−π+ and D¯¯0 → K+π− decays. All helicity amplitudes and phases are measured, and the longitudinal polarisation fraction is determined to be fL = 0.578 ± 0.010 ± 0.011 with world-best precision, where the first uncertainty is statistical and the second is systematic. The pattern of helicity amplitude magnitudes is found to align with expectations from quark-helicity conservation in B decays. The ratio of branching fractions [ℬ(B0→D∗−D∗+s) × ℬ(D∗+s→D+sγ)]/ℬ(B0 → D*−D+s) is measured to be 2.045 ± 0.022 ± 0.071 with world-best precision. In addition, the first observation of the Cabibbo-suppressed Bs → D*−D+s decay is made with a significance of seven standard deviations. The branching fraction ratio ℬ(Bs → D*−D+s)/ℬ(B0 → D*−D+s) is measured to be 0.049 ± 0.006 ± 0.003 ± 0.002, where the third uncertainty is due to limited knowledge of the ratio of fragmentation fractions. | ||
| 461 | |t Journal of High Energy Physics | ||
| 463 | |t Vol. 2021, iss. 6 |v [177, 29 p.] |d 2021 | ||
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| 701 | 1 | |a Eydelman |b S. I. |g Semen Isaakovich | |
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