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Observation of new excited Bs0 states.

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Title: Observation of new excited Bs0 states.
Authors: Aaij, R.1 (AUTHOR), Beteta, C. Abellán2 (AUTHOR), Ackernley, T.3 (AUTHOR), Adeva, B.4 (AUTHOR), Adinolfi, M.5 (AUTHOR), Afsharnia, H.6 (AUTHOR), Aidala, C. A.7 (AUTHOR), Aiola, S.8 (AUTHOR), Ajaltouni, Z.6 (AUTHOR), Akar, S.9 (AUTHOR), Albrecht, J.10 (AUTHOR), Alessio, F.11 (AUTHOR), Alexander, M.12 (AUTHOR), Albero, A. Alfonso13 (AUTHOR), Aliouche, Z.14 (AUTHOR), Alkhazov, G.15 (AUTHOR), Cartelle, P. Alvarez11 (AUTHOR), Amato, S.16 (AUTHOR), Amhis, Y.17 (AUTHOR), An, L.18 (AUTHOR)
Source: European Physical Journal C -- Particles & Fields. Jul2021, Vol. 81 Issue 7, p1-11. 11p.
Subjects: Proton-proton interactions, Excited states, Mass spectrometry, Luminosity, Photons
Abstract: A structure is observed in the 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 fb - 1 . The structure is interpreted as the result of overlapping excited 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 ± K ∓ , are determined to be 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 ∗ ± K ∓ , with a missing photon from the B ∗ ± → B ± γ decay, which are shifted by approximately 45 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 s 2 ∗ 0 state is determined to be 0.87 ± 0.15 (stat) ± 0.19 (syst) . [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Observation of new excited Bs0 states.
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  Data: <searchLink fieldCode="AR" term="%22Aaij%2C+R%2E%22">Aaij, R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Beteta%2C+C%2E+Abellán%22">Beteta, C. Abellán</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ackernley%2C+T%2E%22">Ackernley, T.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adeva%2C+B%2E%22">Adeva, B.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adinolfi%2C+M%2E%22">Adinolfi, M.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Afsharnia%2C+H%2E%22">Afsharnia, H.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aidala%2C+C%2E+A%2E%22">Aidala, C. A.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aiola%2C+S%2E%22">Aiola, S.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ajaltouni%2C+Z%2E%22">Ajaltouni, Z.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Akar%2C+S%2E%22">Akar, S.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Albrecht%2C+J%2E%22">Albrecht, J.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alessio%2C+F%2E%22">Alessio, F.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alexander%2C+M%2E%22">Alexander, M.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Albero%2C+A%2E+Alfonso%22">Albero, A. Alfonso</searchLink><relatesTo>13</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aliouche%2C+Z%2E%22">Aliouche, Z.</searchLink><relatesTo>14</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alkhazov%2C+G%2E%22">Alkhazov, G.</searchLink><relatesTo>15</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cartelle%2C+P%2E+Alvarez%22">Cartelle, P. Alvarez</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Amato%2C+S%2E%22">Amato, S.</searchLink><relatesTo>16</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Amhis%2C+Y%2E%22">Amhis, Y.</searchLink><relatesTo>17</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22An%2C+L%2E%22">An, L.</searchLink><relatesTo>18</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+C+--+Particles+%26+Fields%22">European Physical Journal C -- Particles & Fields</searchLink>. Jul2021, Vol. 81 Issue 7, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Proton-proton+interactions%22">Proton-proton interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Excited+states%22">Excited states</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+spectrometry%22">Mass spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Luminosity%22">Luminosity</searchLink><br /><searchLink fieldCode="DE" term="%22Photons%22">Photons</searchLink>
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  Data: A structure is observed in the 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 fb - 1 . The structure is interpreted as the result of overlapping excited 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 ± K ∓ , are determined to be 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 ∗ ± K ∓ , with a missing photon from the B ∗ ± → B ± γ decay, which are shifted by approximately 45 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 s 2 ∗ 0 state is determined to be 0.87 ± 0.15 (stat) ± 0.19 (syst) . [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1140/epjc/s10052-021-09305-3
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