A Measurement of the ψ′ to J/ψ production ratio in 920 GeV proton-nucleus interactions

被引：0

作者：

I. Abt

M. Adams

M. Agari

H. Albrecht

A. Aleksandrov

V. Amaral

A. Amorim

S.J. Aplin

V. Aushev

Y. Bagaturia

V. Balagura

M. Bargiotti

O. Barsukova

J. Bastos

J. Batista

C. Bauer

T.S. Bauer

A. Belkov

I. Belotelov

A. Bertin

B. Bobchenko

M. Böcker

A. Bogatyrev

G. Bohm

M. Bräuer

M. Bruinsma

M. Bruschi

P. Buchholz

T. Buran

J. Carvalho

P. Conde

C. Cruse

M. Dam

K.M. Danielsen

M. Danilov

S. De Castro

H. Deppe

X. Dong

H.B. Dreis

V. Egorytchev

K. Ehret

F. Eisele

D. Emeliyanov

S. Essenov

L. Fabbri

P. Faccioli

M. Feuerstack-Raible

J. Flammer

B. Fominykh

机构：

[1] NIKHEF,Department ECM, Faculty of Physics

[2] University of Barcelona,Institute of Engineering Physics

[3] Institute for High Energy Physics,Institut für Physik

[4] Tsinghua University,Dipartimento di Fisica

[5] Humboldt-Universität zu Berlin,Department of Physics

[6] Università di Bologna and INFN Sezione di Bologna,Institut für Physik

[7] University of Cincinnati,Physikalisches Institut

[8] LIP Coimbra,Department of Physics

[9] Niels Bohr Institutet,Institute for Nuclear Research

[10] Universität Dortmund,Lehrstuhl für Informatik V

[11] Joint Institute for Nuclear Research Dubna,Max

[12] DESY,Planck

[13] Max-Planck-Institut für Kernphysik,Institut für Physik

[14] Universität Heidelberg,Dept. of Physics

[15] University of Houston,Fachbereich Physik

[16] Ukrainian Academy of Science,Fachbereich Physik

[17] J. Stefan Institute,Institute for Nuclear Research

[18] University of Ljubljana,Physik

[19] University of California,Institut

[20] Universität Mannheim,Dipartimento di Energetica

[21] University of Maribor,undefined

[22] Institute of Theoretical and Experimental Physics,undefined

[23] Werner-Heisenberg-Institut,undefined

[24] University of Oslo,undefined

[25] Universität Rostock,undefined

[26] Universität Siegen,undefined

[27] INRNE-BAS,undefined

[28] Universiteit Utrecht/NIKHEF,undefined

[29] DESY,undefined

[30] Universität Zürich,undefined

[31] Università di Firenze and INFN Sezione di Bologna,undefined

[32] P.N. Lebedev Physical Institute,undefined

[33] Moscow Physical Engineering Institute,undefined

[34] Moscow State University,undefined

[35] Institute for High Energy Physics,undefined

[36] High Energy Physics Institute,undefined

来源：

The European Physical Journal C | 2007年 / 49卷

关键词：

Monte Carlo; Production Cross Section; Production Ratio; Muon System; Double Ratio;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Ratios of the ψ′ over the J/ψ production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The ψ′ and J/ψ states were reconstructed in both the μ+μ- and the e+e- decay modes. The measurements covered the kinematic range -0.35≤xF≤0.1 with transverse momentum pT≤4.5 GeV/c. The angular dependence of the ratio has been used to measure the difference of the ψ′ and J/ψ polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is Rψ′(μ)/Rψ′(e)=1.00±0.08±0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B′(μ)B(e))/(B(μ)B′(e)), of ψ′ and J/ψ in the two channels. The ψ′ to J/ψ production ratio is almost constant in the covered xF range and shows a slow increase with pT.

引用

页码：545 / 558

页数：13

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