Evidence for an excess of soft photons in hadronic decays of Z0

被引：0

作者：

J. Abdallah

P. Abreu

W. Adam

P. Adzic

T. Albrecht

T. Alderweireld

R. Alemany-Fernandez

T. Allmendinger

P.P. Allport

U. Amaldi

N. Amapane

S. Amato

E. Anashkin

A. Andreazza

S. Andringa

N. Anjos

P. Antilogus

W-D. Apel

Y. Arnoud

S. Ask

B. Asman

J.E. Augustin

A. Augustinus

P. Baillon

A. Ballestrero

P. Bambade

R. Barbier

D. Bardin

G.J. Barker

A. Baroncelli

M. Battaglia

M. Baubillier

K-H. Becks

M. Begalli

A. Behrmann

E. Ben-Haim

N. Benekos

A. Benvenuti

C. Berat

M. Berggren

L. Berntzon

D. Bertrand

M. Besancon

N. Besson

D. Bloch

M. Blom

M. Bluj

M. Bonesini

M. Boonekamp

P.S.L. Booth

机构：

[1] Iowa State University,Department of Physics and Astronomy

[2] Universiteit Antwerpen,Physics Department

[3] IIHE,Faculté des Sciences

[4] ULB-VUB,Physics Laboratory

[5] Univ. de l’Etat Mons,Department of Physics

[6] University of Athens,Dipartimento di Fisica

[7] University of Bergen,Depto. de Física

[8] Università di Bologna and INFN,Inst. de Física

[9] Centro Brasileiro de Pesquisas Físicas,Collège de France, Lab. de Physique Corpusculaire

[10] Pont. Univ. Católica,Institut de Recherches Subatomiques

[11] Univ. Estadual do Rio de Janeiro,Institute of Nuclear Physics

[12] IN2P3-CNRS,FZU, Inst. of Phys.

[13] CERN,Dipartimento di Fisica

[14] IN2P3 - CNRS/ULP - BP20,Institut des Sciences Nucléaires, IN2P3

[15] DESY-Zeuthen,CNRS

[16] N.C.S.R. Demokritos,Helsinki Institute of Physics and Department of Physical Sciences

[17] C.A.S. High Energy Physics Division,Institut für Experimentelle Kernphysik

[18] Università di Genova and INFN,Faculty of Physics and Nuclear Techniques

[19] Université de Grenoble 1,Lab. de l’Accélérateur Linéaire, IN2P3

[20] University of Helsinki,CNRS

[21] Joint Institute for Nuclear Research,School of Physics and Chemistry

[22] Universität Karlsruhe,Department of Physics

[23] Institute of Nuclear Physics PAN,Dept. of Physics and Astronomy, Kelvin Building

[24] University of Mining and Metallurgy,LPNHE, IN2P3

[25] Université de Paris-Sud,CNRS

[26] University of Lancaster,Department of Physics

[27] LIP,IPNL, IN2P3

[28] IST,CNRS

[29] FCUL,Dipartimento di Fisica

[30] University of Liverpool,Dipartimento di Fisica

[31] University of Glasgow,IPNP of MFF

[32] Univ. Paris VI et VII,Physics Department

[33] University of Lund,Physics Department

[34] Université Claude Bernard de Lyon,Dpto. Fisica

[35] Università di Milano and INFN-MILANO,Department of Physics

[36] Univ. di Milano-Bicocca and INFN-MILANO,Dipartimento di Fisica

[37] Charles Univ.,Rutherford Appleton Laboratory

[38] NIKHEF,Dipartimento di Fisica

[39] National Technical University,Dipartimento di Fisica

[40] University of Oslo,DAPNIA/Service de Physique des Particules

[41] Univ. Oviedo,Instituto de Fisica de Cantabria (CSIC

[42] University of Oxford,UC)

[43] Università di Padova and INFN,Laboratory for Astroparticle Physics

[44] Chilton,Department of Physics

[45] Università di Roma II and INFN,Fysikum

[46] Università di Roma III and INFN,Dipartimento di Fisica Sperimentale

[47] CEA-Saclay,INFN, Sezione di Torino and Dipartimento di Fisica Teorica

[48] Avda. los Castros s/n,Dipartimento di Fisica

[49] Inst. for High Energy Physics Serpukov,Istituto di Fisica

[50] J. Stefan Institute,Department of Radiation Sciences

来源：

The European Physical Journal C - Particles and Fields | 2006年 / 47卷

关键词：

Monte Carlo; Hadronic Decay; Opal Collaboration; Soft Photon; Kinematic Range;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qq̄ disintegrations of the Z0 were studied in the kinematic range 0.2<Eγ<1 GeV and transverse momentum with respect to the closest jet direction pT<80 MeV/c. A clear excess of photons in the experimental data as compared to the Monte Carlo predictions is observed. This excess (uncorrected for the photon detection efficiency) is (1.17±0.06±0.27)×10-3 γ/jet in the specified kinematic region, while the expected level of the inner hadronic bremsstrahlung (which is not included in the Monte Carlo) is (0.340±0.001±0.038)×10-3 γ/jet. The ratio of the excess to the predicted bremsstrahlung rate is then (3.4±0.2±0.8), which is similar in strength to the anomalous soft photon signal observed in fixed target experiments with hadronic beams.

引用

页码：273 / 294

页数：21

共 50 条

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Abdallah, J.
Abreu, P.
Adam, W.
Adzic, P.
Albrecht, T.
Alderweireld, T.
Alemany-Fernandez, R.
Allmendinger, T.
Allport, P. P.
Amaldi, U.
Amapane, N.
Amato, S.
Anashkin, E.
Andreazza, A.
Andringa, S.
Anjos, N.
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Apel, W-D.
Arnoud, Y.
Ask, S.
Asman, B.
Augustin, J. E.
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Baillon, P.
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Bambade, P.
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Bardin, D.
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Behrmann, A.
Ben-Haim, E.
Benekos, N.
Benvenuti, A.
Berat, C.
Berggren, M.
Berntzon, L.
Bertrand, D.
Besancon, M.
Besson, N.
Bloch, D.
Blom, M.
Bluj, M.
Bonesini, M.
Boonekamp, M.
Booth, P. S. L.
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