Inclusive Sigma(-) and Lambda(1520) production in hadronic Z decays

Επιστημονική δημοσίευση - Άρθρο Περιοδικού uoadl:3053136 39 Αναγνώσεις

Μονάδα:
Ερευνητικό υλικό ΕΚΠΑ
Τίτλος:
Inclusive Sigma(-) and Lambda(1520) production in hadronic Z decays
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
Production of Sigma(-) and Lambda(1520) in hadronic Z decays has been
measured using the DELPHI detector at LEP. The Sigma(-) is directly
reconstructed as a charged track in the DELPHI microvertex detector and
is identified by its Sigma –> n pi decay leading to a kink between the
Sigma(-) and pi-track. The reconstruction of the Lambda(1520) resonance
relies strongly on the particle identification capabilities of the
barrel Ring Imaging Cherenkov detector and on the ionisation loss
measurement of the TPC. Inclusive production spectra are measured for
both particles. The production rates are measured to be
[NSigma-/N-Z(had)] = 0.081 +/- 0.002 +/- 0.010,
[N-Lambda(1520)/N-Z(had)] = 0.029 +/- 0.005 +/- 0.005.
The production rate of the Lambda(1520) suggests that a large fraction
of the stable baryons descend from orbitally excited baryonic states. It
is shown that the baryon production rates in Z decays follow a universal
phenomenological law related to isospin, strangeness and mass of the
particles. (C) 2000 Elsevier Science B.V. All rights reserved.
Έτος δημοσίευσης:
2000
Συγγραφείς:
Abreu, P
Adam, W
Adye, T
Adzic, P
Ajinenko, I and
Albrecht, Z
Alderweireld, T
Alekseev, GD
Alemany, R and
Allmendinger, T
Allport, PP
Almehed, S
Amaldi, U and
Amapane, N
Amato, S
Anassontzis, EG
Andersson, P and
Andreazza, A
Andringa, S
Antilogus, P
Apel, WD
Arnoud, Y
and Asman, B
Augustin, JE
Augustinus, A
Baillon, P and
Ballestrero, A
Bambade, P
Barao, F
Barbiellini, G and
Barbier, R
Bardin, DY
Barker, G
Baroncelli, A
Battaglia,
M
Baubillier, M
Becks, KH
Begalli, M
Behrmann, A and
Beilliere, P
Belokopytov, Y
Benekos, NC
Benvenuti, AC and
Berat, C
Berggren, M
Bertrand, D
Besancon, M
Bigi, M and
Bilenky, MS
Bizouard, MA
Bloch, D
Blom, HM
Bonesini, M
and Boonekamp, M
Booth, PSL
Borisov, G
Bosio, C
Botner,
O
Boudinov, E
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Bowcock, TJV and
Boyko, I
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DELPHI Collaboration
Περιοδικό:
PHYSICS LETTERS B
Εκδότης:
Elsevier
Τόμος:
475
Αριθμός / τεύχος:
3-4
Σελίδες:
429-447
Επίσημο URL (Εκδότης):
DOI:
10.1016/S0370-2693(00)00081-2
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