Study of the B<sup>+</sup><sub>c</sub> → J/ψ D<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→ J/ψ D<sup>*+</sup><sub>s</sub> decays with the ATLAS detector
The decays B<sup>+</sup><sub>c</sub>→J/ψD<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub> are studied with the ATLAS detector at the LHC using a dataset corresponding...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2016
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/80966 |
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I19-R120-10915-80966 |
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dspace |
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Universidad Nacional de La Plata |
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I-19 |
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R-120 |
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SEDICI (UNLP) |
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Inglés |
| topic |
Ciencias Exactas Física Partículas Elementales ATLAS detector la̵rge hadron collider |
| spellingShingle |
Ciencias Exactas Física Partículas Elementales ATLAS detector la̵rge hadron collider Alconada Verzini, María Josefina Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Monticelli, Fernando Gabriel Wahlberg, Hernán Pablo The ATLAS Collaboration Study of the B<sup>+</sup><sub>c</sub> → J/ψ D<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→ J/ψ D<sup>*+</sup><sub>s</sub> decays with the ATLAS detector |
| topic_facet |
Ciencias Exactas Física Partículas Elementales ATLAS detector la̵rge hadron collider |
| description |
The decays B<sup>+</sup><sub>c</sub>→J/ψD<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub> are studied with the ATLAS detector at the LHC using a dataset corresponding to integrated luminosities of 4.9 and 20.6 fb<sup>−1</sup> of pp collisions collected at centre-of-mass energies √s=7 TeV and 8 TeV, respectively. Signal candidates are identified through J/ψ→μ+μ− and D<sup>(*)+</sup><sub>s</sub>→ϕπ+(γ/π<sup>0</sup>) decays. With a two-dimensional likelihood fit involving the B<sup>+</sup><sub>c</sub> reconstructed invariant mass and an angle between the μ+ and D<sup>+</sup><sub>s</sub> candidate momenta in the muon pair rest frame, the yields of B<sup>+</sup><sub>c</sub>→J/ψD<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub>, and the transverse polarisation fraction in B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub> decay are measured. The transverse polarisation fraction is determined to be Γ±±(B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub>)/Γ(B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub>)=0.38±0.23±0.07, and the derived ratio of the branching fractions of the two modes is B<sub>B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub></sub>/B<sub>B<sup>+</sup><sub>c</sub>→J/ψD<sup>+</sup><sub>s</sub></sub>=2.8+1.2−0.8±0.3 , where the first error is statistical and the second is systematic. Finally, a sample of B<sup>+</sup><sub>c</sub>→J/ψπ+ decays is used to derive the ratios of branching fractions BB<sub>B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub></sub>/B<sub>B<sup>+</sup><sub>c</sub>→J/ψπ+</sub>=3.8±1.1±0.4±0.2 and B<sub>B<sup>+</sup><sub>c</sub>→J/ψD<sup>*+</sup><sub>s</sub></sub>/B<sub>B<sup>+</sup><sub>c</sub>→J/ψπ+</sub>=10.4±3.1±1.5±0.6, where the third error corresponds to the uncertainty of the branching fraction of D<sup>+</sup><sub>s</sub>→ϕ(K+K−)π+ decay. The available theoretical predictions are generally consistent with the measurement. |
| format |
Articulo Articulo |
| author |
Alconada Verzini, María Josefina Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Monticelli, Fernando Gabriel Wahlberg, Hernán Pablo The ATLAS Collaboration |
| author_facet |
Alconada Verzini, María Josefina Alonso, Francisco Arduh, Francisco Anuar Dova, María Teresa Monticelli, Fernando Gabriel Wahlberg, Hernán Pablo The ATLAS Collaboration |
| author_sort |
Alconada Verzini, María Josefina |
| title |
Study of the B<sup>+</sup><sub>c</sub> → J/ψ D<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→ J/ψ D<sup>*+</sup><sub>s</sub> decays with the ATLAS detector |
| title_short |
Study of the B<sup>+</sup><sub>c</sub> → J/ψ D<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→ J/ψ D<sup>*+</sup><sub>s</sub> decays with the ATLAS detector |
| title_full |
Study of the B<sup>+</sup><sub>c</sub> → J/ψ D<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→ J/ψ D<sup>*+</sup><sub>s</sub> decays with the ATLAS detector |
| title_fullStr |
Study of the B<sup>+</sup><sub>c</sub> → J/ψ D<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→ J/ψ D<sup>*+</sup><sub>s</sub> decays with the ATLAS detector |
| title_full_unstemmed |
Study of the B<sup>+</sup><sub>c</sub> → J/ψ D<sup>+</sup><sub>s</sub> and B<sup>+</sup><sub>c</sub>→ J/ψ D<sup>*+</sup><sub>s</sub> decays with the ATLAS detector |
| title_sort |
study of the b<sup>+</sup><sub>c</sub> → j/ψ d<sup>+</sup><sub>s</sub> and b<sup>+</sup><sub>c</sub>→ j/ψ d<sup>*+</sup><sub>s</sub> decays with the atlas detector |
| publishDate |
2016 |
| url |
http://sedici.unlp.edu.ar/handle/10915/80966 |
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