Observation of new excited $${B} ^0_{s} $$ B s 0 states
Abstract A structure is observed in the $${B} ^{\pm }{K} ^{\mp }$$ B...
| Main Authors: | , , , , , , , , , , , , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
|
| Online Access: | https://hdl.handle.net/1721.1/136913 |
| _version_ | 1810981389939507200 |
|---|---|
| author | Aaij, R. Beteta, C. A. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Albero, A. A. Aliouche, Z. Alkhazov, G. Cartelle, P. A. Amato, S. Amhis, Y. An, L. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Aaij, R. Beteta, C. A. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Albero, A. A. Aliouche, Z. Alkhazov, G. Cartelle, P. A. Amato, S. Amhis, Y. An, L. |
| author_sort | Aaij, R. |
| collection | MIT |
| description | Abstract
A structure is observed in the
$${B} ^{\pm }{K} ^{\mp }$$
B
±
K
∓
mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9
$$\,\text {fb} ^{-1}$$
fb
-
1
. The structure is interpreted as the result of overlapping excited
$${B} ^0_{s} $$
B
s
0
states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to
$${B} ^{\pm }{K} ^{\mp }$$
B
±
K
∓
, are determined to be
$$\begin{aligned} m_1&= 6063.5 \pm 1.2 \text { (stat)} \pm 0.8\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _1&= 26 \pm 4 \text { (stat)} \pm 4\text { (syst)}\,\text {Me}\text {V}, \\ m_2&= 6114 \pm 3 \text { (stat)} \pm 5\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _2&= 66 \pm 18 \text { (stat)} \pm 21\text { (syst)}\,\text {Me}\text {V}. \end{aligned}$$
m
1
=
6063.5
±
1.2
(stat)
±
0.8
(syst)
Me
,
Γ
1
=
26
±
4
(stat)
±
4
(syst)
Me
,
m
2
=
6114
±
3
(stat)
±
5
(syst)
Me
,
Γ
2
=
66
±
18
(stat)
±
21
(syst)
Me
.
Alternative values assuming a decay through
$${B} ^{*\pm }{K} ^{\mp }$$
B
∗
±
K
∓
, with a missing photon from the
$$B^{*\pm } \rightarrow B^{\pm }\gamma $$
B
∗
±
→
B
±
γ
decay, which are shifted by approximately 45
$$\,\text {Me}$$
Me
V, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed
$$B_{s2}^{*0}$$
B
s
2
∗
0
state is determined to be
$$0.87 \pm 0.15 \text { (stat)} \pm 0.19 \text { (syst)}$$
0.87
±
0.15
(stat)
±
0.19
(syst)
. |
| first_indexed | 2024-09-23T10:13:59Z |
| format | Article |
| id | mit-1721.1/136913 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:13:59Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1369132023-09-07T20:32:43Z Observation of new excited $${B} ^0_{s} $$ B s 0 states Aaij, R. Beteta, C. A. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Albero, A. A. Aliouche, Z. Alkhazov, G. Cartelle, P. A. Amato, S. Amhis, Y. An, L. Massachusetts Institute of Technology. Department of Physics Abstract A structure is observed in the $${B} ^{\pm }{K} ^{\mp }$$ B ± K ∓ mass spectrum in a sample of proton–proton collisions at centre-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of 9 $$\,\text {fb} ^{-1}$$ fb - 1 . The structure is interpreted as the result of overlapping excited $${B} ^0_{s} $$ B s 0 states. With high significance, a two-peak hypothesis provides a better description of the data than a single resonance. Under this hypothesis the masses and widths of the two states, assuming they decay directly to $${B} ^{\pm }{K} ^{\mp }$$ B ± K ∓ , are determined to be $$\begin{aligned} m_1&= 6063.5 \pm 1.2 \text { (stat)} \pm 0.8\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _1&= 26 \pm 4 \text { (stat)} \pm 4\text { (syst)}\,\text {Me}\text {V}, \\ m_2&= 6114 \pm 3 \text { (stat)} \pm 5\text { (syst)}\,\text {Me}\text {V}, \\ \Gamma _2&= 66 \pm 18 \text { (stat)} \pm 21\text { (syst)}\,\text {Me}\text {V}. \end{aligned}$$ m 1 = 6063.5 ± 1.2 (stat) ± 0.8 (syst) Me , Γ 1 = 26 ± 4 (stat) ± 4 (syst) Me , m 2 = 6114 ± 3 (stat) ± 5 (syst) Me , Γ 2 = 66 ± 18 (stat) ± 21 (syst) Me . Alternative values assuming a decay through $${B} ^{*\pm }{K} ^{\mp }$$ B ∗ ± K ∓ , with a missing photon from the $$B^{*\pm } \rightarrow B^{\pm }\gamma $$ B ∗ ± → B ± γ decay, which are shifted by approximately 45 $$\,\text {Me}$$ Me V, are also determined. The possibility of a single state decaying in both channels is also considered. The ratio of the total production cross-section times branching fraction of the new states relative to the previously observed $$B_{s2}^{*0}$$ B s 2 ∗ 0 state is determined to be $$0.87 \pm 0.15 \text { (stat)} \pm 0.19 \text { (syst)}$$ 0.87 ± 0.15 (stat) ± 0.19 (syst) . 2021-11-01T14:34:09Z 2021-11-01T14:34:09Z 2021-07-12 2021-07-18T03:09:05Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136913 The European Physical Journal C. 2021 Jul 12;81(7):601 PUBLISHER_CC en https://doi.org/10.1140/epjc/s10052-021-09305-3 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Aaij, R. Beteta, C. A. Ackernley, T. Adeva, B. Adinolfi, M. Afsharnia, H. Aidala, C. A. Aiola, S. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Albero, A. A. Aliouche, Z. Alkhazov, G. Cartelle, P. A. Amato, S. Amhis, Y. An, L. Observation of new excited $${B} ^0_{s} $$ B s 0 states |
| title | Observation of new excited $${B} ^0_{s} $$ B s 0 states |
| title_full | Observation of new excited $${B} ^0_{s} $$ B s 0 states |
| title_fullStr | Observation of new excited $${B} ^0_{s} $$ B s 0 states |
| title_full_unstemmed | Observation of new excited $${B} ^0_{s} $$ B s 0 states |
| title_short | Observation of new excited $${B} ^0_{s} $$ B s 0 states |
| title_sort | observation of new excited b 0 s b s 0 states |
| url | https://hdl.handle.net/1721.1/136913 |
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