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Title: Observation of the Heavy Baryons {sigma}{sub b} and {sigma}{sub b}*

Abstract

We report an observation of new bottom baryons produced in pp collisions at the Tevatron. Using 1.1 fb{sup -1} of data collected by the CDF II detector, we observe four {lambda}{sub b}{sup 0}{pi}{sup {+-}} resonances in the fully reconstructed decay mode {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -}, where {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +}. We interpret these states as the {sigma}{sub b}{sup (*){+-}} baryons and measure the following masses: m{sub {sigma}{sub b}{sup +}}=5807.8{sub -2.2}{sup +2.0}(stat.){+-}1.7(syst.) MeV/c{sup 2}, m{sub {sigma}{sub b}{sup -}}=5815.2{+-}1.0(stat.){+-}1.7(syst.) MeV/c{sup 2}, and m({sigma}{sub b}*)-m({sigma}{sub b})=21.2{sub -1.9}{sup +2.0}(stat.){sub -0.3}{sup +0.4}(syst.) MeV/c{sup 2}.

Authors:
; ; ; ; ; ;  [1]; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
  2. University of Illinois, Urbana, Illinois 61801 (United States)
Publication Date:
OSTI Identifier:
21024466
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 99; Journal Issue: 20; Other Information: DOI: 10.1103/PhysRevLett.99.202001; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). CDF Collaboration; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BEAUTY BARYONS; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; KAONS MINUS; LAMBDA C PLUS BARYONS; MASS; PARTICLE DECAY; PIONS MINUS; PIONS PLUS; PROTON-PROTON INTERACTIONS; SIGMA BARYONS

Citation Formats

Aaltonen, T, Maki, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Abulencia, A, Budd, S, Ciobanu, C I, Errede, D, Errede, S, Gerberich, H, Grundler, U, Junk, T R, Kraus, J, Marino, C P, Pitts, K, Rogers, E, and Taffard, A. Observation of the Heavy Baryons {sigma}{sub b} and {sigma}{sub b}*. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.99.202001.
Aaltonen, T, Maki, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Abulencia, A, Budd, S, Ciobanu, C I, Errede, D, Errede, S, Gerberich, H, Grundler, U, Junk, T R, Kraus, J, Marino, C P, Pitts, K, Rogers, E, & Taffard, A. Observation of the Heavy Baryons {sigma}{sub b} and {sigma}{sub b}*. United States. https://doi.org/10.1103/PHYSREVLETT.99.202001
Aaltonen, T, Maki, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Abulencia, A, Budd, S, Ciobanu, C I, Errede, D, Errede, S, Gerberich, H, Grundler, U, Junk, T R, Kraus, J, Marino, C P, Pitts, K, Rogers, E, and Taffard, A. 2007. "Observation of the Heavy Baryons {sigma}{sub b} and {sigma}{sub b}*". United States. https://doi.org/10.1103/PHYSREVLETT.99.202001.
@article{osti_21024466,
title = {Observation of the Heavy Baryons {sigma}{sub b} and {sigma}{sub b}*},
author = {Aaltonen, T and Maki, T and Mehtala, P and Orava, R and Osterberg, K and Saarikko, H and Remortel, N van and Abulencia, A and Budd, S and Ciobanu, C I and Errede, D and Errede, S and Gerberich, H and Grundler, U and Junk, T R and Kraus, J and Marino, C P and Pitts, K and Rogers, E and Taffard, A},
abstractNote = {We report an observation of new bottom baryons produced in pp collisions at the Tevatron. Using 1.1 fb{sup -1} of data collected by the CDF II detector, we observe four {lambda}{sub b}{sup 0}{pi}{sup {+-}} resonances in the fully reconstructed decay mode {lambda}{sub b}{sup 0}{yields}{lambda}{sub c}{sup +}{pi}{sup -}, where {lambda}{sub c}{sup +}{yields}pK{sup -}{pi}{sup +}. We interpret these states as the {sigma}{sub b}{sup (*){+-}} baryons and measure the following masses: m{sub {sigma}{sub b}{sup +}}=5807.8{sub -2.2}{sup +2.0}(stat.){+-}1.7(syst.) MeV/c{sup 2}, m{sub {sigma}{sub b}{sup -}}=5815.2{+-}1.0(stat.){+-}1.7(syst.) MeV/c{sup 2}, and m({sigma}{sub b}*)-m({sigma}{sub b})=21.2{sub -1.9}{sup +2.0}(stat.){sub -0.3}{sup +0.4}(syst.) MeV/c{sup 2}.},
doi = {10.1103/PHYSREVLETT.99.202001},
url = {https://www.osti.gov/biblio/21024466}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 20,
volume = 99,
place = {United States},
year = {2007},
month = {11}
}