Observation of theΞb0Baryon

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 31 Aug 2011Embargo end date: 01 Jan 2011 United Kingdom, France, United States, United Kingdom, Spain, Spain, Italy, Switzerland, United Kingdom English Publisher:American Physical Society (APS)Journal:Physical Review Letters, volume 107 (issn: 0031-9007, eissn: 1079-7114,

Copyright policy )Publicly funded

Authors: Yang, Un-Ki; Aaltonen, T.; Álvarez González, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; +193 Authors

Yang, Un-Ki; Aaltonen, T.; Álvarez González, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J. A.; Apresyan, A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashmanskas, W.; Auerbach, B.; Aurisano, A.; Azfar, F.; Badgett, W.; Barbaro-Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Barria, P.; Bartos, P.; Bauce, M.; Bauer, G.; Bedeschi, F.; Beecher, D.; Behari, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Beretvas, A.; Bhatti, A.; Binkley, M.; Bisello, D.; Bizjak, I.; Bland, K. R.; Blumenfeld, B.; Bocci, A.; Bodek, A.; Bortoletto, D.; Boudreau, J.; Boveia, A.; Brigliadori, L.; Brisuda, A.; Bromberg, C.; Brucken, E.; Bucciantonio, M.; Budagov, J.; Budd, H. S.; Budd, S.; Burkett, K.; Busetto, G.; Bussey, P.; Buzatu, A.; Calancha, C.; Camarda, S.; Campanelli, M.; Campbell, M.; Canelli, F.; Carls, B.; Carlsmith, D.; Carosi, R.; Carrillo, S.; Carron, S.; Casal, B.; Casarsa, M.; Castro, A.; Catastini, P.; Cauz, D.; Cavaliere, V.; Cavalli-Sforza, M.; Cerri, A.; Cerrito, L.; Chen, Y. C.; Chertok, M.; Chiarelli, G.; Chlachidze, G.; Chlebana, F.; Cho, K.; Chokheli, D.; Chou, J. P.; Chung, W. H.; Chung, Y. S.; Ciobanu, C. I.; Ciocci, M. A.; Clark, A.; Clarke, C.; Compostella, G.; Convery, M. E.; Conway, J.; Corbo, M.; Cordelli, M.; Cox, C. A.; Cox, D. J.; Crescioli, F.; Cuenca Almenar, C.; Cuevas, J.; Culbertson, R.; Dagenhart, D.; D'Ascenzo, N.; Datta, M.; De Barbaro, P.; De Cecco, S.; De Lorenzo, G.; Dell'Orso, M.; Deluca, C.; Demortier, L.; Deng, J.; Deninno, M.; Devoto, F.; D'Errico, M.; Di Canto, A.; Di Ruzza, B.; Dittmann, J. R.; D'Onofrio, M.; Donati, S.; Dong, P.; Dorigo, M.; Dorigo, T.; Ebina, K.; Elagin, A.; Eppig, A.; Erbacher, R.; Errede, D.; Errede, S.; Ershaidat, N.; Eusebi, R.; Fang, H. C.; Farrington, S.; Feindt, M.; Fernandez, J. P.; Ferrazza, C.; Field, R.; Flanagan, G.; Forrest, R.; Frank, M. J.; Franklin, M.; Freeman, J. C.; Funakoshi, Y.; Furic, I.; Gallinaro, M.; Galyardt, J.; Garcia, J. E.; Garfinkel, A. F.; Garosi, P.; Gerberich, H.; Gerchtein, E.; Giagu, S.; Giakoumopoulou, V.; Giannetti, P.; Gibson, K.; Ginsburg, C. M.; Giokaris, N.; Giromini, P.; Giunta, M.; Giurgiu, G.; Glagolev, V.; Glenzinski, D.; Gold, M.; Goldin, D.; Goldschmidt, N.; Golossanov, A.; Gomez, G.; Gomez-Ceballos, G.; Goncharov, M.; González, O.; Gorelov, I.; Goshaw, A. T.; Goulianos, K.; Grinstein, S.; Grosso-Pilcher, C.; Group, R. C.; Guimaraes Da Costa, J.; Gunay-Unalan, Z.; Haber, C.; Hahn, S. R.; Halkiadakis, E.; Hamaguchi, A.; Han, J. Y.; Happacher, F.; Hara, K.; Hare, D.; Hare, M.; Harr, R. F.; Hatakeyama, K.; Hays, C.; Heck, M.; Heinrich, J.; Herndon, M.; Hewamanage, S.; Hidas, D.; Hocker, A.; Hopkins, W.; Horn, D.; Hou, S.; Hughes, R. E.; Hurwitz, M.; Husemann, U.;

doi: 10.1103/physrevlett.107.102001 , 10.48550/arxiv.1107.4015

pmid: 21981493

arXiv: 1107.4015

handle: 10261/46367 , 10651/10724 , 10902/2152 , 11567/963545

Observation of theΞb0Baryon

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Abstract

The observation of the bottom, strange baryon $Ξ^0_b$ through the decay chain $Ξ^0_b \rightarrow Ξ_c^+ \, π^-$, where $Ξ_c^+ \rightarrow Ξ^- \, π^+ \, π^+$, $Ξ^- \rightarrow Λ\, π^-$, and $Λ\rightarrow p \, π^-$, is reported using data corresponding to an integrated luminosity of 4.2 fb$^{-1}$ from $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV recorded with the Collider Detector at Fermilab. A signal of $25.3^{+5.6}_{-5.4}$ candidates is observed whose probability of arising from a background fluctuation is $3.6 \times 10^{-12}$, corresponding to 6.8 Gaussian standard deviations. The $Ξ^0_b$ mass is measured to be $5787.8\pm5.0(\textrm{stat})\pm1.3(\textrm{syst})$ MeV/$c^2$. In addition, the $Ξ^-_b$ baryon is observed through the process $Ξ^-_b \rightarrow Ξ_c^0 \, π^-$, where $Ξ_c^0 \rightarrow Ξ^-\, π^+$, $Ξ^- \rightarrow Λ\, π^-$, and $Λ\rightarrow p \, π^-$.

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United Kingdom, France, United States, United Kingdom, Spain, Spain, Italy, Switzerland, United Kingdom

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University of Illinois at Urbana Champaign
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Keywords

[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], [SDU.ASTR.HE] Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], FOS: Physical sciences, Measuring Methods, Baryon production, 530, 72 Physics Of Elementary Particles And Fields, High Energy Physics - Experiment, Hadronic decays, High Energy Physics - Experiment (hep-ex), Baryons, 14.20.Mr, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Bottom baryons, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Xi Baryons Experiment-Hep, 500, Experiment-Hep, Proton-Antiproton Interactions, Tev Range 01-10, Fermilab Collider Detector, 13.30.Eg, [PHYS.ASTR.HE] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], 13.60.Rj, 500.2, ddc: ddc:500.2

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