Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons
Abstract The time-dependent CP asymmetries of B0 → π+π− and B s 0...
| Main Authors: | , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
|
| Online Access: | https://hdl.handle.net/1721.1/132052 |
| _version_ | 1811068492583010304 |
|---|---|
| author | Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. |
| author_sort | Aaij, R. |
| collection | MIT |
| description | Abstract
The time-dependent CP asymmetries of B0 → π+π− and
B
s
0
$$ {B}_s^0 $$
→ K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are
C
ππ
=
−
0.311
±
0.045
±
0.015
,
S
ππ
=
−
0.706
±
0.042
±
0.013
,
C
KK
=
0.123
±
0.034
±
0.015
,
S
KK
=
0.164
±
0.034
±
0.014
,
A
KK
Δ
Γ
=
−
0.83
±
0.05
±
0.09
,
$$ {\displaystyle \begin{array}{c}{C}_{\pi \pi}=-0.311\pm 0.045\pm 0.015,\\ {}{S}_{\pi \pi}=-0.706\pm 0.042\pm 0.013,\\ {}{C}_{KK}=0.123\pm 0.034\pm 0.015,\\ {}{S}_{KK}=0.164\pm 0.034\pm 0.014,\\ {}{\mathcal{A}}_{KK}^{\Delta \varGamma }=-0.83\pm 0.05\pm 0.09,\end{array}} $$
where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0 → K + π− and
B
s
0
$$ {B}_s^0 $$
→ K−π+ decays and the results are
A
CP
B
0
=
−
0.0824
±
0.0033
±
0.0033
,
A
CP
B
s
0
=
0.236
±
0.013
±
0.011
.
$$ {\displaystyle \begin{array}{c}{A}_{CP}^{B^0}=-0.0824\pm 0.0033\pm 0.0033,\\ {}{A}_{CP}^{B_s^0}=0.236\pm 0.013\pm 0.011.\end{array}} $$
All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in
B
s
0
$$ {B}_s^0 $$
decays. |
| first_indexed | 2024-09-23T07:56:47Z |
| format | Article |
| id | mit-1721.1/132052 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T07:56:47Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1320522023-12-22T21:18:06Z Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. Massachusetts Institute of Technology. Department of Physics Abstract The time-dependent CP asymmetries of B0 → π+π− and B s 0 $$ {B}_s^0 $$ → K+K− decays are measured using a data sample of pp collisions corresponding to an integrated luminosity of 1.9 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. The results are C ππ = − 0.311 ± 0.045 ± 0.015 , S ππ = − 0.706 ± 0.042 ± 0.013 , C KK = 0.123 ± 0.034 ± 0.015 , S KK = 0.164 ± 0.034 ± 0.014 , A KK Δ Γ = − 0.83 ± 0.05 ± 0.09 , $$ {\displaystyle \begin{array}{c}{C}_{\pi \pi}=-0.311\pm 0.045\pm 0.015,\\ {}{S}_{\pi \pi}=-0.706\pm 0.042\pm 0.013,\\ {}{C}_{KK}=0.123\pm 0.034\pm 0.015,\\ {}{S}_{KK}=0.164\pm 0.034\pm 0.014,\\ {}{\mathcal{A}}_{KK}^{\Delta \varGamma }=-0.83\pm 0.05\pm 0.09,\end{array}} $$ where the first uncertainties are statistical and the second systematic. The same data sample is used to measure the time-integrated CP asymmetries of B0 → K + π− and B s 0 $$ {B}_s^0 $$ → K−π+ decays and the results are A CP B 0 = − 0.0824 ± 0.0033 ± 0.0033 , A CP B s 0 = 0.236 ± 0.013 ± 0.011 . $$ {\displaystyle \begin{array}{c}{A}_{CP}^{B^0}=-0.0824\pm 0.0033\pm 0.0033,\\ {}{A}_{CP}^{B_s^0}=0.236\pm 0.013\pm 0.011.\end{array}} $$ All results are consistent with earlier measurements. A combination of LHCb measurements provides the first observation of time-dependent CP violation in B s 0 $$ {B}_s^0 $$ decays. 2021-09-20T17:41:40Z 2021-09-20T17:41:40Z 2021-03-08 2021-03-14T04:46:28Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/132052 Journal of High Energy Physics. 2021 Mar 08;2021(3):75 PUBLISHER_CC en https://doi.org/10.1007/JHEP03(2021)075 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Aaij, R. Abellán Beteta, C. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Aliouche, Z. Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons |
| title | Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons |
| title_full | Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons |
| title_fullStr | Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons |
| title_full_unstemmed | Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons |
| title_short | Observation of CP violation in two-body B s 0 $$ {B}_{(s)}^0 $$ -meson decays to charged pions and kaons |
| title_sort | observation of cp violation in two body b s 0 b s 0 meson decays to charged pions and kaons |
| url | https://hdl.handle.net/1721.1/132052 |
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