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Journal Articles European Physical Journal C: Particles and Fields Year : 2006

Evidence for an excess of soft photons in hadronic decays of Z$^0$

J. Abdallah (1) , 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 (2) , S. Ask , B. Asman , J.-E. Augustin (1) , A. Augustinus , P. Baillon , A. Ballestrero , P. Bambade (3) , R. Barbier (4) , D. Bardin , G. J. Barker , A. Baroncelli , M. Battaglia , M. Baubillier (1) , K.-H. Becks , M. Begalli , A. Behrmann , E. Ben-Haim (3) , N. Benekos , A. Benvenuti , C. Bérat (2) , M. Berggren (1) , L. Berntzon , D. Bertrand , M. Besançon , N. Besson , D. Bloch (5) , M. Blom , M. Bluj , M. Bonesini , M. Boonekamp , P. S. L. Booth , G. Borisov , O. Botner , B. Bouquet (3) , T. J. V. Bowcock , I. Boyko , M. Bracko , R. Brenner , E. Brodet , P. Brückman , J.-M. Brunet (6) , B. Buschbeck , P. Buschmann , M. Calvi , T. Camporesi , V. Canale , F. Carena , N. Castro , F. Cavallo , M. Chapkin , P. Charpentier , P. Checchia , R. Chierici , P. Shlyapnikov , J. Chudoba , S. U. Chung , K. Cieslik , P. Collins , R. Contri , G. Cosme (3) , F. Cossutti , M. J. Costa , D. J. Crennell , J. Cuevas-Maestro , J. d'Hondt , J. Dalmau , T. da Silva , W. da Silva (1) , G. Della Ricca , A. de Angelis , W. de Boer , C. de Clercq , B. de Lotto , N. de Maria , A. Demin , L. de Paula , L. de Ciaccio , A. Di Simone , K. Doroba , J. Drees , G. Eigen , T. Ekelöf , M. Ellert , M. Elsing , M. C. Espirito-Santo , G. K. Fanourakis , D. Fassouliotis , M. Feindt , J. Fernández , A. Ferrer , F. Ferro , U. Flagmeyer , H. Föth , E. Fokitis , F. Fulda-Quenzer (3) , J. Fuster , M. Gandelman , C. García , P. Gavillet , E. Gazis , R. Gokieli , B. Golob , G. Gómez-Ceballos , Paulo Gonçalves , E. Graziani , G. Grosdidier (3) , K. Grzelak , J. Guy , C. Haag , A. Hallgren , K. Hamacher , K. Hamilton , S. Haug , F. Hauler , V. Hedberg , M. Hennecke , H. Herr , Jakobus Hoffman , S. O. Holmgren , P. J. Holt , M. A. Houlden , K. Hultqvist , J. N. Jackson , G. Jarlskog , P. Jarry , D. Jeans , E. K. Johansson , P. D. Johansson , P. Jonsson (4) , C. Joram , L. Jungermann , F. Kapusta (1) , S. Katsanevas (4) , E. Katsoufis , G. Kernel , B. P. Kersevan , U. Kerzel , B. T. King , N. J. Kjaer , P. Kluit , P. Kokkinias , C. Kourkoumelis , O. Kuznetsov , Z. Krumshtein , M. Kucharczyk , J. Lamsa , G. Leder , F. Ledroit (2) , L. Leinonen , R. Leitner , J. Lemonne , V. Lepeltier (3) , T. Lesiak , W. Liebig , D. Liko , A. Lipniacka , J. H. Lopes , J. M. López , D. Loukas , P. Lutz , L. Lyons , J. Macnaughton , A. Malek , S. Maltezos , F. Mandl , J. Marco , R. Marco , B. Maréchal , M. Margoni , J. C. Marin , C. Mariotti , A. Markou , C. Martínez-Rivero , J. Masik , N. Mastroyiannopoulos , F. Matorras , C. Matteuzzi , F. Mazzucato , M. Mazzucato , R. Mcnulty , C. Meroni , E. Migliore , W.A. Mitaroff , U. Mjörnmark , T. Moa , M. Moch , K. Mönig , R. Monge , J. Montenegro , D. Moraes , S. Moreno , P. Morettini , U. Müller , K. Münich , M. Mulders , L. Mundim , W. Murray , B. Muryn , G. Myatt , T. Myklebust , M. Nassiakou , F. Navarria , K. Nawrocki , R. Nicolaidou , M. Nikolenko (5) , A. Oblakowska-Mucha , V. F. Obraztsov , A. Olshevski , A. Onofre , R. Orava , K. Österberg , A. Ouraou , A. Oyanguren (3) , M. Paganoni , S. Paiano , J. P. Palacios , H. Palka , T. D. Papadopoulou , L. Pape , C. Parkes , F. Parodi , U. Parzefall , A. Passeri , O. Passon , L. Peralta , V. Perepelitsa , A. Perrotta , A. Petrolini , J. Piedra , L. Pieri , F. Pierre , M. Pimenta , E. Piotto , T. Podobnik , V. Poireau , M. E. Pol , G. Polok , V. Pozdnyakov , N. Pukhaeva , A. Pullia , J. Rames , A. Read , P. Rebecchi , J. Rehn , D. Reid , R. Reinhardt , P. B. Renton , F. Richard (3) , J. Rídky , M. Rivero , D. Rodríguez , A. Romero , P. Ronchese , P. Roudeau (3) , T. Rovelli , V. Ruhlmann-Kleider , D. Ryabtchikov , A. Sadovskii , L. Salmi , J. Salt , C. Sander , A. Savoy-Navarro (1) , U. Schwickerath , A. Segar , R. Sekulin , M. Siebel , A. Sisakian , G. Smadja (4) , O. Smirnova , A. Sokolov , A. Sopczak , R. Sosnowski , Tz Spassoff , M. Stanitzki , A. Stocchi (3) , J. Strauss , B. Stugu , M. Szczekowski , M. Szeptycka , T. Szumlak , T. Tabarelli de Fatis , A. C. Taffard , F. Tegenfeldt , J. Timmermans , L. Tkatchev , M. Tobin , S. Todorovova , B. Tomé , A. Tonazzo , Pablo Tortosa , P. Travnicek , D. Treille , G. Tristram (6) , M. Trochimczuk , C. Troncon , M. L. Turluer , I. A. Tyapkin , P. Tyapkin , S. Tzamarias , V. Uvarov , G. Valenti , P. van Dam , J. van Eldik , N. van Remortel , I. van Vulpen , G. Vegni , F. Veloso , W. Venus , P. Verdier (4) , V. Verzi , D. Vilanova , L. Vitale , V. Vrba , H. Wahlen , A. J. Washbrook , C. Weiser , D. Wicke , J. Wickens , G. Wilkinson , M. Winter (5) , M. Witek , O. Yushchenko , A. Zalewska , P. Zalewski , D. Zavrtanik , V. Zhuravlov , N. I. Zimin , A. Zintchenko , M. Zupan
P. Abreu
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W. Adam
  • Function : Author
P. Adzic
  • Function : Author
T. Albrecht
  • Function : Author
T. Alderweireld
  • Function : Author
R. Alemany-Fernandez
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T. Allmendinger
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P. P. Allport
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U. Amaldi
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N. Amapane
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S. Amato
  • Function : Author
E. Anashkin
  • Function : Author
A. Andreazza
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S. Andringa
  • Function : Author
N. Anjos
  • Function : Author
P. Antilogus
W. D. Apel
  • Function : Author
S. Ask
  • Function : Author
B. Asman
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A. Augustinus
  • Function : Author
P. Baillon
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A. Ballestrero
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D. Bardin
  • Function : Author
G. J. Barker
  • Function : Author
A. Baroncelli
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M. Battaglia
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K.-H. Becks
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M. Begalli
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A. Behrmann
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N. Benekos
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A. Benvenuti
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L. Berntzon
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D. Bertrand
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M. Besançon
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N. Besson
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M. Blom
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M. Bluj
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M. Bonesini
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M. Boonekamp
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P. S. L. Booth
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G. Borisov
O. Botner
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T. J. V. Bowcock
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I. Boyko
M. Bracko
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R. Brenner
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E. Brodet
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P. Brückman
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B. Buschbeck
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P. Buschmann
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M. Calvi
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T. Camporesi
  • Function : Author
V. Canale
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F. Carena
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N. Castro
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F. Cavallo
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M. Chapkin
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P. Charpentier
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P. Checchia
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R. Chierici
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P. Shlyapnikov
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J. Chudoba
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S. U. Chung
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K. Cieslik
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P. Collins
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R. Contri
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F. Cossutti
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M. J. Costa
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D. J. Crennell
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J. Cuevas-Maestro
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J. d'Hondt
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J. Dalmau
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T. da Silva
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G. Della Ricca
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A. de Angelis
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W. de Boer
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C. de Clercq
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B. de Lotto
N. de Maria
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A. Demin
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L. de Paula
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L. de Ciaccio
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A. Di Simone
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K. Doroba
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J. Drees
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G. Eigen
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T. Ekelöf
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M. Ellert
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M. Elsing
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M. C. Espirito-Santo
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G. K. Fanourakis
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D. Fassouliotis
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M. Feindt
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J. Fernández
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A. Ferrer
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F. Ferro
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U. Flagmeyer
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H. Föth
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E. Fokitis
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J. Fuster
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M. Gandelman
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C. García
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P. Gavillet
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E. Gazis
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R. Gokieli
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B. Golob
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G. Gómez-Ceballos
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Paulo Gonçalves
E. Graziani
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K. Grzelak
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J. Guy
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C. Haag
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A. Hallgren
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K. Hamacher
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K. Hamilton
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S. Haug
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F. Hauler
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V. Hedberg
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M. Hennecke
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H. Herr
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Jakobus Hoffman
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S. O. Holmgren
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P. J. Holt
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M. A. Houlden
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K. Hultqvist
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J. N. Jackson
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G. Jarlskog
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P. Jarry
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D. Jeans
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E. K. Johansson
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P. D. Johansson
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C. Joram
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L. Jungermann
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E. Katsoufis
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G. Kernel
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B. P. Kersevan
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U. Kerzel
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B. T. King
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N. J. Kjaer
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P. Kluit
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P. Kokkinias
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C. Kourkoumelis
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O. Kuznetsov
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Z. Krumshtein
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M. Kucharczyk
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J. Lamsa
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G. Leder
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L. Leinonen
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R. Leitner
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J. Lemonne
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T. Lesiak
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W. Liebig
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D. Liko
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J. H. Lopes
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J. M. López
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D. Loukas
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P. Lutz
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L. Lyons
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J. Macnaughton
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A. Malek
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S. Maltezos
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F. Mandl
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J. Marco
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R. Marco
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B. Maréchal
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M. Margoni
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J. C. Marin
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C. Mariotti
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A. Markou
C. Martínez-Rivero
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J. Masik
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N. Mastroyiannopoulos
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F. Matorras
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C. Matteuzzi
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F. Mazzucato
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M. Mazzucato
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E. Migliore
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W.A. Mitaroff
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T. Moa
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M. Moch
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K. Mönig
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R. Monge
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J. Montenegro
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D. Moraes
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S. Moreno
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P. Morettini
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U. Müller
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K. Münich
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M. Mulders
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L. Mundim
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W. Murray
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B. Muryn
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G. Myatt
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T. Myklebust
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M. Nassiakou
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F. Navarria
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K. Nawrocki
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R. Nicolaidou
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A. Oblakowska-Mucha
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V. F. Obraztsov
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A. Olshevski
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A. Onofre
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R. Orava
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K. Österberg
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A. Ouraou
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M. Paganoni
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S. Paiano
J. P. Palacios
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H. Palka
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T. D. Papadopoulou
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L. Pape
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C. Parkes
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F. Parodi
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U. Parzefall
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A. Passeri
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O. Passon
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L. Peralta
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V. Perepelitsa
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A. Perrotta
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A. Petrolini
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J. Piedra
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L. Pieri
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F. Pierre
M. Pimenta
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E. Piotto
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T. Podobnik
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G. Polok
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N. Pukhaeva
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A. Pullia
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J. Rames
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A. Read
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P. Rebecchi
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J. Rehn
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D. Reid
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R. Reinhardt
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P. B. Renton
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J. Rídky
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M. Rivero
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D. Rodríguez
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A. Romero
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P. Ronchese
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T. Rovelli
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V. Ruhlmann-Kleider
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D. Ryabtchikov
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A. Sadovskii
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L. Salmi
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J. Salt
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C. Sander
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U. Schwickerath
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A. Segar
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R. Sekulin
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M. Siebel
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A. Sisakian
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O. Smirnova
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A. Sokolov
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A. Sopczak
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R. Sosnowski
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Tz Spassoff
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M. Stanitzki
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J. Strauss
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B. Stugu
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M. Szczekowski
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M. Szeptycka
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T. Szumlak
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T. Tabarelli de Fatis
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A. C. Taffard
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F. Tegenfeldt
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J. Timmermans
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L. Tkatchev
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M. Tobin
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S. Todorovova
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B. Tomé
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A. Tonazzo
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Pablo Tortosa
P. Travnicek
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D. Treille
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M. Trochimczuk
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C. Troncon
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M. L. Turluer
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I. A. Tyapkin
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P. Tyapkin
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S. Tzamarias
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V. Uvarov
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G. Valenti
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P. van Dam
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J. van Eldik
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N. van Remortel
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I. van Vulpen
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G. Vegni
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F. Veloso
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W. Venus
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V. Verzi
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D. Vilanova
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L. Vitale
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V. Vrba
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H. Wahlen
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A. J. Washbrook
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C. Weiser
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D. Wicke
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J. Wickens
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G. Wilkinson
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M. Witek
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O. Yushchenko
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A. Zalewska
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P. Zalewski
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D. Zavrtanik
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V. Zhuravlov
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N. I. Zimin
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A. Zintchenko
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M. Zupan
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Abstract

Soft photons inside hadronic jets converted in front of the DELPHI main tracker (TPC) in events of qqbar disintegrations of the Z^0 were studied in the kinematic range 0.2 < E_gamma < 1 GeV and transverse momentum with respect to the closest jet direction p_T < 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) x 10^{-3} gamma/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) x 10^{-3} gamma/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.

Dates and versions

in2p3-00025986 , version 1 (25-04-2006)

Identifiers

Cite

J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, et al.. Evidence for an excess of soft photons in hadronic decays of Z$^0$. European Physical Journal C: Particles and Fields, 2006, 47, pp.273-294. ⟨10.1140/epjc/s2006-02568-8⟩. ⟨in2p3-00025986⟩
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