Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon.
Using a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb(-1) collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξ(b)(0) → Ξ(c)(+)π(-), Ξ(c)(+)) → pK(-)π(+) signal decays are reconstructed. From this sample, the first measurement of the Ξ(b)(0...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2014
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| _version_ | 1797062178023407616 |
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| author | Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Alvarez Cartelle, P Alves, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Aquines Gutierrez, O Archilli, F |
| author_facet | Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Alvarez Cartelle, P Alves, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Aquines Gutierrez, O Archilli, F |
| author_sort | Aaij, R |
| collection | OXFORD |
| description | Using a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb(-1) collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξ(b)(0) → Ξ(c)(+)π(-), Ξ(c)(+)) → pK(-)π(+) signal decays are reconstructed. From this sample, the first measurement of the Ξ(b)(0) baryon lifetime is made, relative to that of the Λ(b)(0) baryon. The mass differences M(Ξ(b)(0))-M(Λ(b)(0)) and M(Ξ(c)(+))-M(Λ(c)(+)) are also measured with precision more than 4 times better than the current world averages. The resulting values are τ(Ξ(b)(0))/τ(Λ)(b)(0)) = 1.006 ± 0.018 ± 0.010,M(Ξ(b)(0))-M(Λ(b)(0)) = 172.44 ± 0.39 ± 0.17 MeV/c(2),M(Ξ(c)(+))-M(Λ(c)(+)) = 181.51 ± 0.14 ± 0.10 MeV/c(2),where the first uncertainty is statistical and the second is systematic. The relative rate of Ξ(b)(0) to Λ(b)(0) baryon production is measured to be f(Ξ)(b)(0))/f(Λ)(b)(0))B(Ξ(b)(0) → Ξ(c)(+)π(-))/B(Λ(b)(0) → Λ(c)(+)π(-))B(Ξ(c)(+) → pK(-)π(+))/B(Λ(c)(+) → pK(-)}π(+)) = (1.88 ± 0.04 ± 0.03) × 10(-2),where the first factor is the ratio of fragmentation fractions, b → Ξ(b)(0) relative to b → Λ(b)(0). Relative production rates as functions of transverse momentum and pseudorapidity are also presented. |
| first_indexed | 2024-03-06T20:41:51Z |
| format | Journal article |
| id | oxford-uuid:348ea27b-ffbd-491f-a233-b5409ec06b4b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:41:51Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | oxford-uuid:348ea27b-ffbd-491f-a233-b5409ec06b4b2022-03-26T13:26:46ZPrecision measurement of the mass and lifetime of the Ξ(b)(0) baryon.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:348ea27b-ffbd-491f-a233-b5409ec06b4bEnglishSymplectic Elements at Oxford2014Aaij, RAdeva, BAdinolfi, MAffolder, AAjaltouni, ZAkar, SAlbrecht, JAlessio, FAlexander, MAli, SAlkhazov, GAlvarez Cartelle, PAlves, AAmato, SAmerio, SAmhis, YAn, LAnderlini, LAnderson, JAndreassen, RAndreotti, MAndrews, JAppleby, RAquines Gutierrez, OArchilli, FUsing a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb(-1) collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξ(b)(0) → Ξ(c)(+)π(-), Ξ(c)(+)) → pK(-)π(+) signal decays are reconstructed. From this sample, the first measurement of the Ξ(b)(0) baryon lifetime is made, relative to that of the Λ(b)(0) baryon. The mass differences M(Ξ(b)(0))-M(Λ(b)(0)) and M(Ξ(c)(+))-M(Λ(c)(+)) are also measured with precision more than 4 times better than the current world averages. The resulting values are τ(Ξ(b)(0))/τ(Λ)(b)(0)) = 1.006 ± 0.018 ± 0.010,M(Ξ(b)(0))-M(Λ(b)(0)) = 172.44 ± 0.39 ± 0.17 MeV/c(2),M(Ξ(c)(+))-M(Λ(c)(+)) = 181.51 ± 0.14 ± 0.10 MeV/c(2),where the first uncertainty is statistical and the second is systematic. The relative rate of Ξ(b)(0) to Λ(b)(0) baryon production is measured to be f(Ξ)(b)(0))/f(Λ)(b)(0))B(Ξ(b)(0) → Ξ(c)(+)π(-))/B(Λ(b)(0) → Λ(c)(+)π(-))B(Ξ(c)(+) → pK(-)π(+))/B(Λ(c)(+) → pK(-)}π(+)) = (1.88 ± 0.04 ± 0.03) × 10(-2),where the first factor is the ratio of fragmentation fractions, b → Ξ(b)(0) relative to b → Λ(b)(0). Relative production rates as functions of transverse momentum and pseudorapidity are also presented. |
| spellingShingle | Aaij, R Adeva, B Adinolfi, M Affolder, A Ajaltouni, Z Akar, S Albrecht, J Alessio, F Alexander, M Ali, S Alkhazov, G Alvarez Cartelle, P Alves, A Amato, S Amerio, S Amhis, Y An, L Anderlini, L Anderson, J Andreassen, R Andreotti, M Andrews, J Appleby, R Aquines Gutierrez, O Archilli, F Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon. |
| title | Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon. |
| title_full | Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon. |
| title_fullStr | Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon. |
| title_full_unstemmed | Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon. |
| title_short | Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon. |
| title_sort | precision measurement of the mass and lifetime of the ξ b 0 baryon |
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