Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV
We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6 fb[superscript −1] from p[bar over p] collisions at √s = 1.96 TeV and recorded with the Collider Detector at Fermilab. Baryon candidates are reconstructed from d...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/89016 https://orcid.org/0000-0002-6047-4211 |
| _version_ | 1826202527247368192 |
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| author | Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. |
| author2 | Massachusetts Institute of Technology. Laboratory for Nuclear Science |
| author_facet | Massachusetts Institute of Technology. Laboratory for Nuclear Science Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. |
| author_sort | Gomez-Ceballos, Guillelmo |
| collection | MIT |
| description | We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6 fb[superscript −1] from p[bar over p] collisions at √s = 1.96 TeV and recorded with the Collider Detector at Fermilab. Baryon candidates are reconstructed from data collected with an online event selection designed for the collection of long-lifetime heavy-flavor decay products and a second event selection designed to collect J/ψ → μ[superscript +]μ[superscript −] candidates. First evidence for the process Ω[− over b] → Ω[0 over c]π[superscript −] is presented with a significance of 3.3σ. We measure the following baryon masses:
M(Ξ[0 over c]) 2470.85 ± 0.24(stat) ± 0.55(syst) MeV/c[superscript 2], M(Ξ[+ over c]) = 2468.00 ± 0.18(stat) ± 0.51(syst) MeV/c[superscript 2], M(Λ[subscript b]) = 5620.15 ± 0.31(stat) ± 0.47(syst) MeV/c[superscript 2], M(Ξ[− over b]) = 5793.4 ± 1.8(stat) ± 0.7(syst) MeV/c[superscript 2], M(Ξ[0 over b]) = 5788.7 ± 4.3(stat) ± 1.4(syst) MeV/c[superscript 2], and M(Ω[− over b]) = 6047.5 ± 3.8(stat) ± 0.6(syst) MeV/c[superscript 2].
The isospin splitting of the Ξ[− over b][superscript ,0] states is found to be M(Ξ[− over b]) − M(Ξ[0 over b]) = 4.7 ± 4.7(stat) ± 0.7(syst) MeV/c[superscript 2]. The isospin splitting of the Ξ[0 over c][superscript ,+] states is found to be M(Ξ[0 over c]) − M(Ξ[+ over c]) = 2.85 ± 0.30(stat) ± 0.04(syst) MeV/c[superscript 2]. The following lifetime measurements are made:
τ(Λ[subscript b]) = 1.565 ± 0.035(stat) ± 0.020(syst) ps, τ(Ξ[−over b]) = 1.32 ± 0.14(stat) ± 0.02(syst) ps, τ(Ω[− over b]) = 1.66[+0.53 over −0.40](stat) ± 0.02(syst) ps. |
| first_indexed | 2024-09-23T12:08:54Z |
| format | Article |
| id | mit-1721.1/89016 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:08:54Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/890162022-09-28T00:29:29Z Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. Massachusetts Institute of Technology. Laboratory for Nuclear Science Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6 fb[superscript −1] from p[bar over p] collisions at √s = 1.96 TeV and recorded with the Collider Detector at Fermilab. Baryon candidates are reconstructed from data collected with an online event selection designed for the collection of long-lifetime heavy-flavor decay products and a second event selection designed to collect J/ψ → μ[superscript +]μ[superscript −] candidates. First evidence for the process Ω[− over b] → Ω[0 over c]π[superscript −] is presented with a significance of 3.3σ. We measure the following baryon masses: M(Ξ[0 over c]) 2470.85 ± 0.24(stat) ± 0.55(syst) MeV/c[superscript 2], M(Ξ[+ over c]) = 2468.00 ± 0.18(stat) ± 0.51(syst) MeV/c[superscript 2], M(Λ[subscript b]) = 5620.15 ± 0.31(stat) ± 0.47(syst) MeV/c[superscript 2], M(Ξ[− over b]) = 5793.4 ± 1.8(stat) ± 0.7(syst) MeV/c[superscript 2], M(Ξ[0 over b]) = 5788.7 ± 4.3(stat) ± 1.4(syst) MeV/c[superscript 2], and M(Ω[− over b]) = 6047.5 ± 3.8(stat) ± 0.6(syst) MeV/c[superscript 2]. The isospin splitting of the Ξ[− over b][superscript ,0] states is found to be M(Ξ[− over b]) − M(Ξ[0 over b]) = 4.7 ± 4.7(stat) ± 0.7(syst) MeV/c[superscript 2]. The isospin splitting of the Ξ[0 over c][superscript ,+] states is found to be M(Ξ[0 over c]) − M(Ξ[+ over c]) = 2.85 ± 0.30(stat) ± 0.04(syst) MeV/c[superscript 2]. The following lifetime measurements are made: τ(Λ[subscript b]) = 1.565 ± 0.035(stat) ± 0.020(syst) ps, τ(Ξ[−over b]) = 1.32 ± 0.14(stat) ± 0.02(syst) ps, τ(Ω[− over b]) = 1.66[+0.53 over −0.40](stat) ± 0.02(syst) ps. United States. Dept. of Energy National Science Foundation (U.S.) Alfred P. Sloan Foundation 2014-08-25T14:30:12Z 2014-08-25T14:30:12Z 2014-04 2014-04 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1550-2368 http://hdl.handle.net/1721.1/89016 Aaltonen, T., S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, et al. “Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV.” Phys. Rev. D 89, no. 7 (April 2014). © 2014 American Physical Society https://orcid.org/0000-0002-6047-4211 en_US http://dx.doi.org/10.1103/PhysRevD.89.072014 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society American Physical Society |
| spellingShingle | Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV |
| title | Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV |
| title_full | Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV |
| title_fullStr | Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV |
| title_full_unstemmed | Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV |
| title_short | Mass and Lifetime Measurements of Bottom and Charm Baryons in p[bar over p] Collisions at √s = 1.96 TeV |
| title_sort | mass and lifetime measurements of bottom and charm baryons in p bar over p collisions at √s 1 96 tev |
| url | http://hdl.handle.net/1721.1/89016 https://orcid.org/0000-0002-6047-4211 |
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