Observation of events with an energetic forward neutron in deep inelastic scattering at HERA
M. DerrickUniversity andD. KrakauerUniversity andS. MagillUnited States Department of Energy, Washington, United StatesD. MikunasUnited States Department of Energy, Washington, United StatesB. MusgraveArgonne National Laboratory , Argonne , IL , USAJ.R. OkrasińskiUnited States Department of Energy, Washington, United StatesJ. RepondArgonne National Laboratory , Argonne , IL , USAR. StanekArgonne National Laboratory , Argonne , IL , USAR. L. TalagaArgonne National Laboratory , Argonne , IL , USAH. ZhangArgonne National Laboratory , Argonne , IL , USAM.C.K. MattinglyUniversity of Wisconsin–Madison, Madison, United StatesG. BariM. BasileL. BellagambaD. BoscheriniAndrews University , Berrien Springs , Ml , USAA. BruniAndrews University , Berrien Springs , Ml , USAG. BruniAndrews University , Berrien Springs , Ml , USAP. BruniINFN Bologna , Bologna , ltaly41G. Cara RomeoG. CastelliniL. CifarelliF. CindoloAndrews University , Berrien Springs , Ml , USAA. ContinINFN Bologna , Bologna , ltaly41M. CorradiINFN Bologna , Bologna , ltaly41I. GialasINFN Bologna , Bologna , ltaly41P. GiustiG. IacobucciG. LaurentiG. LéviINFN Bologna , Bologna , ltaly41A. MargottiINFN Bologna , Bologna , ltaly41T. MassamINFN Bologna , Bologna , ltaly41R. NaniaINFN Bologna , Bologna , ltaly41F. PalmonariA. PoliniG. SartorelliY. Zamora GarciaAndrews University, Berrien Springs, MI, USAA. ZichichiINFN Bologna , Bologna , ltaly41C. AmelungUniversity andA. BornheimUniversity andJ. CrittendenUniversity andR. DeffnerINFN Bologna , Bologna , ltaly41T. DoekerUniversity of Bonn, Bonn, GermanyM. EckertUniversity of Bonn, Bonn, GermanyL. FeldINFN Bologna , Bologna , ltaly41A. FreyUniversity of Bonn, Bonn, GermanyM. GeertsUniversity andM. GrotheUniversity andH. HartmannUniversity andK. HéinlothUniversity of Bonn, Bonn, GermanyL. HeinzINFN Bologna , Bologna , ltaly41E. HilgerUniversity of Bonn, Bonn, GermanyH.‐P. JakobUniversity andU. KatzUniversity andS. MengelNow at VDI-Technologiezentrum Dusseldorf E. PaulPhysikalisches Institut der Vniversitiif Bonn , Bonn , Germany38Mark PfeifferPhysikalisches Institut der Vniversitiif Bonn , Bonn , Germany38Ch. RembserUniversity of Bonn, Bonn, GermanyD. SchrammUniversity of Bonn, Bonn, GermanyJ. StammPhysikalisches Institut der Vniversitiif Bonn , Bonn , Germany38R. WedemeyerPhysikalisches Institut der Vniversitiif Bonn , Bonn , Germany38S. Campbell-RobsonUniversity andA. CassidyUniversity of Bristol, Bristol, United KingdomW. N. CottinghamPhysikalisches Institut der Vniversitiif Bonn , Bonn , Germany38N. DycePhysics Laboratory University of Bristol , Bristol , VK50B. FosterPhysics Laboratory University of Bristol , Bristol , VK50S. GeorgePhysics Laboratory University of Bristol , Bristol , VK50M.E. HayesUniversity andG.P. HeathColumbia University , Nevis Labs. ,H. F. HeathUniversity of Bristol, Bristol, United KingdomDavid PiccioniPhysikalisches Institut der Vniversitiif Bonn , Bonn , Germany38D. G. RoffPhysics Laboratory University of Bristol , Bristol , VK50R.J. TapperPhysics Laboratory University of Bristol , Bristol , VK50R. YoshidaPhysics Laboratory University of Bristol , Bristol , VK50M. ArneodoUniversity of Bristol, Bristol, United KingdomR. AyadColumbia University , Nevis Labs. ,M. CapuaColumbia University , Nevis Labs. ,A. GarfagniniCalabria University , Physics Dept. and INFN , Cosenza , Italy41L. IannottiPhysics Laboratory University of Bristol , Bristol , VK50M. SchioppaPhysics Laboratory University of Bristol , Bristol , VK50G. SusinnoPhysics Laboratory University of Bristol , Bristol , VK50A. CaldwellNational Science Foundation, Alexandria, United StatesN. CartigliaNational Science Foundation, Alexandria, United StatesZ. JingColumbia University , Nevis Labs. ,W. LiuColumbia University , Nevis Labs. ,J. A. ParsonsNational Science Foundation, Alexandria, United StatesS. TitzNational Science Foundation, Alexandria, United StatesF. SciulliPhysics Laboratory University of Bristol , Bristol , VK50P.B. StraubNational Science Foundation, Alexandria, United StatesL. WaiColumbia University , Nevis Labs. ,S. YangNational Science Foundation, Alexandria, United StatesQingjun ZhuNational Science Foundation, Alexandria, United StatesP. BorzemskiJ. J. ChwastowskiColumbia University , Nevis Labs. ,A. EskreysZ. JakubowskiInst. qf Nuclear Physics , Cracow , Poland4iM. PrzybycieńFaculty of Physics and Nuclenr Techniques , Academy of Mining and Metallurgy , Cracow , Poland45M. ZacharaPhysics Laboratory University of Bristol , Bristol , VK50L. ZawiejskiL. AdamczykFaculty of Physics and Nuclenr Techniques , Academy of Mining and Metallurgy , Cracow , Poland45B. BednarekFaculty of Physics and Nuclenr Techniques , Academy of Mining and Metallurgy , Cracow , Poland45
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ABI
Аннотация
In deep inelastic neutral current scattering of positrons and protons at the center of mass energy of 300 GeV, we observe, with the ZEUS detector, events with a high energy neutron produced at very small scattering angles with respect to the proton direction. The events constitute a fixed fraction of the deep inelastic, neutral current event sample independent of Bjorken x and Q 2 in the range 3 · 10 −4 < x BJ < 6 · 10 −3 and 10 < Q 2 < 100 GeV 2 .
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