Header

UZH-Logo

Maintenance Infos

Precision measurement of the mass and lifetime of the Ξ0b baryon


LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Serra, N; Vollhardt, A; et al (2014). Precision measurement of the mass and lifetime of the Ξ0b baryon. Physical Review Letters, 113(032001):online.

Abstract

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 Ξ0b→Ξ+cπ−, Ξ+c→pK−π+ signal decays are reconstructed. From this sample, the first measurement of the Ξ0b baryon lifetime is made, relative to that of the Λ0b baryon. The mass differences M(Ξ0b)−M(Λ0b) and M(Ξ+c)−M(Λ+c) are also measured with precision more than four times better than the current world averages. The resulting values are τΞ0bτΛ0b=1.006±0.018±0.010, M(Ξ0b)−M(Λ0b)=172.44±0.39±0.17MeV/c2, M(Ξ+c)−M(Λ+c)=181.51±0.14±0.10MeV/c2, where the first uncertainty is statistical and the second is systematic. The relative rate of Ξ0b to Λ0b baryon production is measured to be fΞ0bfΛ0b(Ξ0b→Ξ+cπ−)(Λ0b→Λ+cπ−)(Ξ+c→pK−π+)(Λ+c→pK−π+)=(1.88±0.04±0.03)×10−2, where the first factor is the ratio of fragmentation fractions, b→Ξ0b relative to b→Λ0b. Relative production rates as functions of transverse momentum and pseudorapidity are also presented.

Abstract

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 Ξ0b→Ξ+cπ−, Ξ+c→pK−π+ signal decays are reconstructed. From this sample, the first measurement of the Ξ0b baryon lifetime is made, relative to that of the Λ0b baryon. The mass differences M(Ξ0b)−M(Λ0b) and M(Ξ+c)−M(Λ+c) are also measured with precision more than four times better than the current world averages. The resulting values are τΞ0bτΛ0b=1.006±0.018±0.010, M(Ξ0b)−M(Λ0b)=172.44±0.39±0.17MeV/c2, M(Ξ+c)−M(Λ+c)=181.51±0.14±0.10MeV/c2, where the first uncertainty is statistical and the second is systematic. The relative rate of Ξ0b to Λ0b baryon production is measured to be fΞ0bfΛ0b(Ξ0b→Ξ+cπ−)(Λ0b→Λ+cπ−)(Ξ+c→pK−π+)(Λ+c→pK−π+)=(1.88±0.04±0.03)×10−2, where the first factor is the ratio of fragmentation fractions, b→Ξ0b relative to b→Λ0b. Relative production rates as functions of transverse momentum and pseudorapidity are also presented.

Statistics

Citations

18 citations in Web of Science®
13 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

11 downloads since deposited on 20 Feb 2015
6 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:20 Feb 2015 16:21
Last Modified:27 Apr 2017 23:38
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.113.032001

Download

Preview Icon on Download
Preview
Content: Accepted Version
Filetype: PDF
Size: 568kB
View at publisher

Article Networks

TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.

Author Collaborations