Angular analysis of B0→D∗−D∗+s with D∗+s→D+sγ decays
| Parent link: | Journal of High Energy Physics Vol. 2021, iss. 6.— 2021.— [177, 29 p.] |
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| Nhiều tác giả của công ty: | , |
| Tác giả khác: | , , , , |
| Tóm tắt: | 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. |
| Ngôn ngữ: | Tiếng Anh |
| Được phát hành: |
2021
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| Những chủ đề: | |
| Truy cập trực tuyến: | http://earchive.tpu.ru/handle/11683/72777 https://doi.org/10.1007/JHEP06(2021)177 |
| Định dạng: | Điện tử Chương của sách |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=666695 |