Ogled vira Barion Ξ

{{Infopolje Delec
| name            = barion Ξ 
| image       = 
| caption     = 
| num_types       = 
| statistics      = [[fermion]]ska
| group           = [[barion]]
| generation      = 
| interaction     = 
| antiparticle    = 
| theorized       =
| discovered  = 
| symbol          = <math> \Xi^0   \,</math>, <math> \Xi^{-}\,</math>, …
| electric_charge =  glej seznam barionov Ξ
| spin            = 1/2 - oktet (3/2 -dekuplet)
| isospin = 1/2
|weak_isospin    = 
|weak_hypercharge= 
}}
'''Barion Ξ''' [barión ksi] je pripadnik skupine [[barion]]ov, ki jih označujemo s Ξ. Sestavljeni so iz [[kvark d|kvarka d]] ali [[kvark u|u]] in še dveh težjih [[kvark]]ov. Za to vrsto je značilno, da hitro razpadajo v lažje delce v celi verigi razpadov. Zaradi tega jih imenujejo tudi ''kaskadni delci''. 

Barion <math> \Xi^{-}_{b} \,</math> vsebuje kvarke vseh treh družin. Odkrili so ga leta [[2007]] v [[Fermilab]]u. Znan je tudi kot kaskada B. 

== Seznam barionov Ξ <ref>
{{navedi splet
 |url=http://www.fnal.gov/pub/presspass/press_releases/Dzero_baryon.html
 |title=Fermilab physicists discover "triple-scoop" baryon
 |publisher=[[Fermilab]]
 |year=2007
 |accessdate=14.6.2007
}}</ref><ref>
{{navedi splet
 |url=http://www.fnal.gov/pub/presspass/press_releases/backtobackBaryons.html
 |title=Back-to-Back b Baryons in Batavia
 |publisher=[[Fermilab]]
 |year=2007
 |accessdate=25.6.2007
}}</ref> ==
V preglednici so navedeni tudi barioni Ξ, ki imajo drugačno zgradbo, kot bi jo imeli po razvrstitvi v oktet in dekuplet.

{| class="wikitable" style="text-align: center;"
|-
! ime delca
! oznaka
! kvarki
! [[mirovna masa]] ([[Elektronvolt|MeV]]/[[hitrost svetlobe|c]]<sup>2</sup>)
! width="50"|[[izospin|I]]
! width="50"|[[skupna vrtilna količina|J]]<sup>[[parnost (fizika)|P]]</sup>
! width="50"|[[naboj|q]] ([[osnovni naboj|e]])
! width="50"|[[čudnost (fizika)|S]]
! width="50"|[[čar (fizika)|C]]
! width="50"|[[dno (fizika)|B']]
! [[srednji življenjski čas]] </br> ([[sekunda|s]])
! razpad
|-
| Xi <ref name=PDGXi0>{{navedi revijo |author=W.-M. Yao|display-authors= et al. |publisher=Particle Data Group |title=Particle listings - Neutral Xi |journal=[[Journal of Physics G]]  |volume=33 |issue=1 |year=2006 |url=http://pdg.lbl.gov/2007/listings/s023.pdf |accessdate= 20.4.2008 }}</ref>
|align="center"| <math> \Xi^{0} \,</math>
|align="center"| <math> uss \,</math>
|align="center"| 1&thinsp;314,86&thinsp;±&thinsp;0,20
|align="center"| {{frac|1|2}}
|align="center"| {{frac|1|2}}<sup>+<sup>*</sup></sup>
|align="center"| 0
|align="center"| &minus;2
|align="center"| 0
|align="center"| 0
|align="center"| 2,90±0,09.10<sup>-10</sup>
|align="center"| [[barion Λ|Λ<sup>0</sup>]] + [[pion|π<sup>0</sup>]]
|-
| Xi <ref name=PDGXi->{{navedi revijo |author=W.-M. Yao|display-authors= et al. |publisher=Particle Data Group |title=Particle listings - Negative Xi |journal=[[Journal of Physics G]]  |volume=33 |issue=1 |year=2006 |url=http://pdg.lbl.gov/2007/listings/s022.pdf |accessdate= 20.4.2008 }}</ref>
|align="center"| <math> \Xi^{-} \,</math>
|align="center"| <math>dss \,</math>
|align="center"| 1321,31&thinsp;±&thinsp;0,13
|align="center"| {{frac|1|2}}
|align="center"| {{frac|1|2}}<sup>+<sup>*</sup></sup>
|align="center"| &minus;1
|align="center"| &minus;2
|align="center"| 0
|align="center"| 0
|align="center"| 1639±0,015.10<sup>-10</sup>
|align="center"| [[barion Λ|Λ<sup>0</sup>]] + [[pion|π<sup>-</sup>]]
|-
|-
| resonanca Ξ <ref name=PDGXi(1530)>{{navedi splet |url=http://pdg.lbl.gov/2007/listings/b049.pdf |title=Particle Data Groups: 2006 Review of Particle Physics - Xi(1530)|accessdate=20.4.2008 }}</ref>
|align="center"| <math> \Xi^{0}(1530) \,</math>
|align="center"| <math>uss \,</math>
|align="center"| 1 531,80(32)
|align="center"| {{frac|1|2}}
|align="center"| {{frac|3|2}}<sup>+</sup>
|align="center"| 0
|align="center"| &minus;2
|align="center"| 0
|align="center"| 0
|align="center"|
|align="center"| Ξ + [[pion|π]]
|-
| resonanca Ξ <ref name=PDGXi(1530)/>
|align="center"| <math> \Xi^{-}(1530) \,</math>
|align="center"| <math> dss \,</math>
|align="center"| 1 535,0(6)
|align="center"| {{frac|1|2}}
|align="center"| {{frac|3|2}}<sup>+</sup>
|align="center"| &minus;1
|align="center"| &minus;2
|align="center"| 0
|align="center"| 0
|align="center"|
|align="center"| Ξ + [[pion|π]]
|-
| Ξ s čarom<ref name=PDGCharmedBaryons>{{cite journal |author=W.-M. Yao|display-authors= et al. |publisher=Particle Data Group |title=Particle listings - Charmed baryons |journal=[[Journal of Physics G]]  |volume=33 |issue=1 |year=2006 |url=http://pdg.lbl.gov/2007/tables/bxxxcharm.pdf |accessdate= 20.4.2008 }}</ref>
|align="center"| <math> \Xi^{+}_c \,</math>
|align="center"| <math> usc \,</math>
|align="center"| 2&thinsp;467,9&thinsp;±&thinsp;0,4
|align="center"| {{frac|1|2}}
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| +1
|align="center"| &minus;1
|align="center"| +1
|align="center"| 0
|align="center"| 4,42±0,26.10<sup>-13</sup>
|align="center"| [http://pdg.lbl.gov/2007/tables/bxxxcharm.pdf Glej načine razpada <math> \Xi^{+}_c \,</math>]
|-
| Ξ s čarom <ref name=PDGCharmedBaryons/>
|align="center"| <math> \Xi^{0}_c \,</math>
|align="center"| <math> dsc \,</math>
|align="center"| 2&thinsp;471,0&thinsp;±&thinsp;0,4
|align="center"| {{frac|1|2}}
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| 0
|align="center"| &minus;1
|align="center"| +1
|align="center"| 0
|align="center"| 1,12{{±|+0,13|-0,10}}.10<sup>-13</sup>
|align="center"| [http://pdg.lbl.gov/2007/tables/bxxxcharm.pdf Glej načine razpada <math> \Xi^{0}_c \,</math>]
|-
| resonanca Ξ s čarom <ref name=PDGCharmedBaryons/>
|align="center"| <math> \Xi^{'+}_c \,</math>
|align="center"| <math> usc \,</math>
|align="center"| 2 575,7±3,1
|align="center"| {{frac|1|2}}
|align="center"| {{frac|1|2}}<sup>+</sup>†
|align="center"| +1
|align="center"| &minus;1
|align="center"| +1
|align="center"| 0
|align="center"|
|align="center"| <math> \Xi^{+}_c \,</math> + [[foton|γ]] (opaženo)
|-
| resonanca Ξ s čarom <ref name=PDGCharmedBaryons/>
|align="center"| <math> \Xi^{'0}_c \,</math>
|align="center"| <math> dsc \,</math>
|align="center"| 2 578,0±2,9
|align="center"| {{frac|1|2}}
|align="center"| {{frac|1|2}}<sup>+</sup>†
|align="center"| 0
|align="center"| &minus;1
|align="center"| +1
|align="center"| 0
|align="center"| 1,1.10<sup>-13</sup>
|align="center"| <math> \Xi^{0}_c \,</math> + [[foton|γ]] (opaženo)
|-
| Ξ z dvojnim čarom <sup>†</sup>
|align="center"| <math> \Xi^{++}_{cc} \,</math>
|align="center"| <math> ucc \,</math>
|align="center"|
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| +2
|align="center"| 0
|align="center"| +2
|align="center"| 0
|align="center"|
|align="center"|
|-
| Ξ z dvojnim čarom <sup>[a]</sup> <ref name=PDGDoubleCharmedxi>{{navedi revijo|author=W.-M. Yao|display-authors= et al. |publisher=Particle Data Group |title=Particle listings - Double charmed positive Xi |journal=[[Journal of Physics G]]  |volume=33 |issue=1 |year=2006 |url=http://pdg.lbl.gov/2007/listings/s065.pdf |accessdate= 20.4.2008 }}</ref>
|align="center"| <math> \Xi^{+}_{cc} \,</math>
|align="center"| <math> dcc \,</math>
|align="center"| 3&thinsp;518,9&thinsp;±&thinsp;0,9<sup>[c]</sup>
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| +1
|align="center"| 0
|align="center"| +2
|align="center"| 0
|align="center"| <3,3.10<sup>-14</sup><sup>[a]</sup>
|align="center"| [[barion Λ|Λ<sup>+</sup><sub>c</sub>]] + [[kaon|K<sup>-</sup>]] + [[pion|π<sup>+</sup>]] ali </br> [[proton|p<sup>+</sup>]] + [[mezon D|D<sup>+</sup>]] + [[kaon|K<sup>-</sup>]]
|-
| Ξ z dnom <ref name=PDGBottomXi>{{cite journal |author=W.-M. Yao|display-authors= et al. |publisher=Particle Data Group |title=Particle listings - Bottom Xis |journal=[[Journal of Physics G]]  |volume=33 |issue=1 |year=2006 |url=http://pdg.lbl.gov/2007/listings/s060.pdf |accessdate= 20.4.2008 }}</ref>
|align="center"| <math> \Xi^{0}_{b} \,</math>
|align="center"| <math> usb \,</math>
|align="center"| 5&thinsp;792&thinsp;±&thinsp;3
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+</sup>*
|align="center"| 0
|align="center"| &minus;1
|align="center"| 0
|align="center"| &minus;1
|align="center"| 1,42{{±|+0,28|-0,24}}.10<sup>-12</sup>
|align="center"| [http://pdg.lbl.gov/2007/listings/s060.pdf Glej načine razpada <math> \Xi_b \,</math>]
|-
| Ξ z dnom ali <br />kaskada B <ref name=PDGBottomXi/><ref name=AbazovBottomXi->{{navedi revijo |author=V. M. Abazov |display-authors=et al. |title=Direct observation of the strange b baryon Xi(b)- |journal=[[Physical Review Letters]] |volume=99 |pages=052001 |year=2007 |url=http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0706.1690 |accessdate=2008-04-25 |doi=10.1103/PhysRevLett.99.052001 |archive-date=2012-12-15 |archive-url=https://archive.today/20121215010243/http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0706.1690 |url-status=dead }}</ref><ref>{{navedi revijo |author=T. Aaltonen |display-authors=et al. |title=Observation and mass measurement of the baryon Xi(b)- |journal=[[Physical Review Letters]] |volume=99 |pages=052002 |year=2007 |url=http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0707.0589 |accessdate=2008-04-25 |doi=10.1103/PhysRevLett.99.052002 |archive-date=2012-05-26 |archive-url=https://archive.today/20120526104150/http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0707.0589 |url-status=dead }}</ref>
|align="center"| <math> \Xi^{-}_{b} \,</math>
|align="center"| <math> dsb \,</math>
|align="center"| 5&thinsp;792,9&thinsp;±&thinsp;3,0
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| &minus;1
|align="center"| &minus;1
|align="center"| 0
|align="center"| &minus;1
|align="center"| 1,42.10<sup>-12</sup>
|align="center"| [http://pdg.lbl.gov/2007/listings/s060.pdf Glej načine razpada <math> \Xi_b \,</math>] </br> (opažen je tudi razpad <math> \Xi^{-} \,</math> +  [[mezon J/Ψ|J/ψ]])
|-
| Ξ z dvakratnim dnom<sup>†</sup>
|align="center"| <math> \Xi^{0}_{bb} \,</math>
|align="center"| <math> ubb \,</math>
|align="center"|
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| 0
|align="center"| 0
|align="center"| 0
|align="center"| &minus;2
|align="center"|
|align="center"|
|-
| Ξ z dvakratnim dnom <sup>†</sup>
|align="center"| <math> \Xi^{-}_{bb} \,</math>
|align="center"| <math> dbb \,</math>
|align="center"|
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| &minus;1
|align="center"| 0
|align="center"| 0
|align="center"| &minus;2
|align="center"|
|align="center"|
|-
| Ξ z dnom in čarom<sup>†</sup>
|align="center"| <math> \Xi^{+}_{cb} \,</math>
|align="center"| <math> ucb \, </math>
|align="center"|
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+</sup>
|align="center"| +1
|align="center"| 0
|align="center"| +1
|align="center"| &minus;1
|align="center"|
|align="center"|
|-
| Ξ z dnom in čarom <sup>†</sup>
|align="center"| <math> \Xi^{0}_{cb} \,</math>
|align="center"| <math> dcb \,</math>
|align="center"|
|align="center"| {{frac|1|2}}*
|align="center"| {{frac|1|2}}*&thinsp;<sup>+<sup>*</sup></sup>
|align="center"| 0
|align="center"| 0
|align="center"| +1
|align="center"| &minus;1
|align="center"|
|align="center"|
|}
† Delec še ni bil opažen.</br>

== Opombe in sklici ==
{{opombe}}

== Glej tudi ==
* [[seznam barionov]]

== Zunanje povezave ==
* [http://hyperphysics.phy-astr.gsu.edu/hbase/particles/sigma.html Sigma barion na Hyperphysics] {{ikona en}}

[[Kategorija:Barioni]]
{{normativna kontrola}}