The results of a measurement of the proton structure function F 2 (x; Q 2) and the virtual photon-proton cross section are reported for momentum transfers squared Q 2 between 0.35 GeV 2 and 3.5 GeV 2 and for Bjorken-x values down to 6 10 ?6 using data collected by the HERA experiment H1 in 1995. The data represent an increase in kinematic reach to lower x and Q 2 values of about a factor of 5 compared to previous H1 measurements. Including measurements from xed target experiments the rise of F 2 with decreasing x is found to be less steep for the lowest Q 2 values measured. Phenomenological models at low Q 2 are compared with the data.

Inclusive K 0 and photoproduction has been investigated at HERA with the H1 detector at an average photon-proton center of mass energy of 200 GeV in the transverse momentum range 0:5 < p t < 5 GeV. The production rates as a function of p t and center of mass rapidity are compared to those obtained in deep inelastic scattering at hQ 2 i = 23 GeV 2. A similar comparison is made of the rapidity spectra of charged particles. The rate of strangeness photoproduc-tion is compared with p p measurements. The observations are also compared with next-to-leading order QCD calculations and the predictions of a Monte Carlo model.

Deep inelastic e p scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening and jet mass in the current hemisphere of the Breit frame over a large range of momentum transfers Q between 7 GeV and 100 GeV. The data are compared with results from e + e ? experiments. Using second order QCD calculations and an approach to relate hadronisation eeects to power corrections an analysis of the Q dependences of the means of the event shape parameters is presented, from which both the power corrections and the strong coupling constant are determined without any assumption on fragmentation models. The power corrections of all event shape variables investigated follow a 1=Q behaviour and can be described by a common parameter 0 .

Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign charged particles produced in deep inelastic positron-proton scattering in a new kinematical domain. The data were taken with the H1 detector at the HERA storage ring in 1994, in which 27.5 GeV positrons collided with 820 GeV protons at a centre of mass energy p s = 300 GeV. The observed enhancement of the like-sign correlations at low invariant masses is related to the dimensions of the hadronic source. The data are compared to diierent QCD models where the hadronization is performed with the string-fragmentation model. Results are presented for the rst time separately for diiractive and non-diiractive scattering, in domains of four-momentum transfer, Bjorken-x, and hadronic center of mass energy, and in intervals of charged particle multiplicity. The observed source radii do not diier strongly from those measured in lower energy lepton-nucleon inelastic scattering, and e + e ? annihilation.

At the HERA electron-proton collider an event has been observed in the H1 detector which shows an isolated muon recoiling against a hadronic system, both of high transverse momentum. The event was registered in a total integrated luminosity of 4 pb ?1 .

A measurement of the inclusive cross section for the deep-inelastic scattering of positrons oo protons at HERA is presented at momentum transfers 8:5 Q 2 35 GeV 2 and large inelasticity y = 0:7, i.e. for the Bjorken-x range 0:00013 x 0:00055. Using a next-to-leading order QCD t to the structure function F 2 at lower y values, the contribution of F 2 to the measured cross section at high y is calculated and, by subtraction, the longitudinal structure function F L is determined for the rst time with an average value of

Events with no hadronic energy ow in a large interval of pseudo-rapidity in the proton direction are observed in photon-proton interactions at an average centre of mass energy < p s p > of 200 GeV. These events are interpreted as photon diirac-tive dissociation. Evidence for hard scattering in photon diiractive dissociation is demonstrated using inclusive single particle spectra, thrust as a function of transverse energy, and the observation of jet production. The data can be described by a Monte Carlo calculation including hard photon-Pomeron scattering.

A measurement is presented, using data taken with the H1 detector at HERA, of the contribution of diiractive interactions to deep{inelastic electron{proton (ep) scattering in the kinematic range 8:5 < Q 2 < 50 GeV 2 , 2:410 ?4 < Bjorken{x < 0:0133, and 3:7 10 ?4 < x IP < 0:043. The diiractive contribution to the proton structure function F 2 (x; Q 2) is evaluated as a function of the appropriate deep{inelastic scattering variables x IP , Q 2 , and (= x=x IP) using a class of deep{inelastic ep scattering events with no hadronic energy ow in an interval of pseudo{rapidity adjacent to the proton beam direction. The dependence of this contribution on x IP is measured to be x ?n IP with n = 1:19 0:06(stat:) 0:07(syst:) independent of and Q 2 , which is consistent with both a diiractive interpretation and a factorisable ep diiractive cross section. A rst measurement of the deep{inelastic structure of the pomeron in the form of the Q 2 and dependences of a factorised structure function is presented. For all measured , this structure function is observed to be consistent with scale invariance.

A measurement is made of the cross section for the process ep ! eXY in deep-inelastic scattering with the H1 detector at HERA. The cross section is presented in terms of a diierential structure function F D(3) 2 (x IP ; ; Q 2) of the proton over the kinematic range 4:5 < Q 2 < 75 GeV 2. The dependence of F D(3) 2 on x IP is found to vary with , demonstrating that a factorisation of F D(3) 2 with a single diiractive ux independent of and Q 2 is not tenable. An interpretation in which a leading diiractive exchange and a subleading reggeon contribute to F D(3) 2 reproduces well the x IP dependence of F D(3) 2 with values for the pomeron and subleading reggeon (model), respectively. A t is performed of the data using a QCD motivated model, in which parton distributions are assigned to the leading and subleading exchanges. In this model, the majority of the momentum of the pomeron must be carried by gluons in order for the data to be well described.

An investigation of the hadronic nal state in diiractive and non{diiractive deep{inelastic electron{proton scattering at HERA is presented, where diiractive data are selected experimentally by demanding a large gap in pseudo{rapidity around the proton remnant direction. The transverse energy ow in the hadronic nal state is evaluated using a set of estimators which quantify topological properties. Using available Monte Carlo QCD calculations, it is demonstrated that the nal state in diiractive DIS exhibits the features expected if the interaction is interpreted as the scattering of an electron oo a current quark with associated eeects of perturbative QCD. A model in which deep{inelastic diiraction is taken to be the exchange of a pomeron with partonic structure is found to reproduce the measurements well. Models for deep{inelastic ep scattering, in which a sizeable diiractive contribution is present because of non{perturbative eeects in the production of the hadronic nal state, reproduce the general tendencies of the data but in all give a worse description.

An analysis is presented of scaling violations of the proton structure function F 2 (x; Q 2) measured with the H1 detector at HERA in the range of Bjorken x values between x = 310 ?4 and 10 ?2 for four-momentum transfers Q 2 larger than 8.7 GeV 2. The structure function F 2 (x; Q 2) is observed to rise linearly with lnQ 2. Under the assumption that the observed scaling violations at small x 0:01 are described correctly by perturbative QCD, an estimate is obtained of the gluon distribution function G(x; Q 2 o) at Q 2 o = 20 GeV 2 .

A thrust analysis of Large-Rapidity-Gap events in deep-inelastic ep collisions is presented , using data taken with the H1 detector at HERA in 1994. The average thrust of the nal states X, which emerge from the dissociation of virtual photons in the range 10 < Q 2 < 100 GeV 2 , grows with hadronic mass M X and implies a dominant 2-jet topology. Thrust is found to decrease with growing P t , the thrust jet momentum transverse to the photon-proton collision axis. Distributions of P 2 t are consistent with being independent of M X. They show a strong alignment of the thrust axis with the photon-proton collision axis, and have a large high?P t tail. The correlation of thrust with M X is similar to that in e + e ? annihilation at p s ee = M X , but with lower values of thrust in the ep data. The data cannot be described by interpreting the dissociated system X as a q q state but inclusion of a substantial fraction of q qg parton conngurations leads naturally to the observed properties. The soft colour exchange interaction model does not describe the data.

Evidence is presented using data taken with the H1 detector at HERA for a class of deep inelastic electron{proton scattering (DIS) events (5 < Q 2 < 120 GeV 2) at low Bjorken-x (10 ?4 < x < 10 ?2) which have almost no hadronic energy ow in a large interval of pseudo-rapidity around the proton remnant direction and which cannot be attributed to our present understanding of DIS and uctuations in-nal state hadronic fragmentation. From an integrated luminosity of 273 nb ?1 , 734 events, that is about 5% of the total DIS sample, have no energy deposition greater than 400MeV forward of laboratory pseudo-rapidity max = 1:8 up to the largest measurable pseudo-rapidity of about 3:65. Evidence that about 10% of observed rapidity gap events are exclusive vector meson electroproduction is presented. Good descriptions of the data are obtained using models based either on a vector meson dominance like picture, which includes a large fraction of inelastic virtual photon dissociation, or on deep inelastic electron{pomeron scattering in which the partonic sub{structure of the latter is resolved.

ISSN 0418-9833 August 1994 A Search for Heavy Leptons at HERA H1 Collaboration Abstract: A search for direct production of new leptons in the mass range from 10 GeV up to 225 GeV is presented by the H1 experiment at HERA. The data were obtained during 1993 and correspond to an integrated luminosity of 528 nb 1. The search includes heavy lepton decays to nal states e ( ) and e ( )W , e ( )Z with the subsequent decay of the W and Z bosons into jets or lepton pairs. No evidence was found for the production of new massive electrons or neutrinos in any of the decay channels. Rejection limits for excited electrons and neutrinos are derived.

Quasi-elastic (z > 0.95) photo-production of ψ(2S) mesons has been observed at HERA for photon-proton centre-of-mass energies in the range 40 to 160 GeV. The ψ(2S) mesons were identified through their decays to l+l− and to J/ψ π+π−, where the J/ψ subsequently decays to l+l−, the lepton l being either a muon or an electron. The cross-section for quasi-elastic photoproduction was measured to be (18.0±2.8(stat)±3.0(syst)) nb at a photon-proton centre-of-mass energy of 80 GeV. The ratio of the ψ(2S) to J/ψ quasi-elastic cross-sections is (0.150 ± 0.027(stat) ± 0.022(syst)). Submitted to Physics Letters B C. Adloff35, S. Aid13, M. Anderson23, V. Andreev26, B. Andrieu29, V. Arkadov36, C. Arndt11, I. Ayyaz30, A. Babaev25, J. Bähr36, J. Bán18, P. Baranov26, E. Barrelet30, R. Barschke11, W. Bartel11, U. Bassler30, M. Beck14, H.-J. Behrend11, C. Beier16, A. Belousov26, Ch. Berger1, G. Bernardi30, G. Bertrand-Coremans4, R. Beyer11, P. Biddulph23, J.C. Bizot28, K. Borras8, V. Boudry29, S. Bourov25, A. Braemer15, W. Braunschweig1, V. Brisson28, D.P. Brown23, W. Brückner14, P. Bruel29, D. Bruncko18, C. Brune16, J. Bürger11, F.W. Büsser13, A. Buniatian4, S. Burke19, G. Buschhorn27, D. Calvet24, A.J. Campbell11, T. Carli27, M. Charlet11, D. Clarke5, B. Clerbaux4, S. Cocks20, J.G. Contreras8, C. Cormack20, J.A. Coughlan5, M.-C. Cousinou24, B.E. Cox23, G. Cozzika9, D.G. Cussans5, J. Cvach31, S. Dagoret30, J.B. Dainton20, W.D. Dau17, K. Daum40, M. David9, A. De Roeck11, E.A. De Wolf4, B. Delcourt28, M. Dirkmann8, P. Dixon19, W. Dlugosz7, K.T. Donovan21, J.D. Dowell3, A. Droutskoi25, J. Ebert35, T.R. Ebert20, G. Eckerlin11, V. Efremenko25, S. Egli38, R. Eichler37, F. Eisele15, E. Eisenhandler21, E. Elsen11, M. Erdmann15, A.B. Fahr13, L. Favart28, A. Fedotov25, R. Felst11, J. Feltesse9, J. Ferencei18, F. Ferrarotto33, K. Flamm11, M. Fleischer8, M. Flieser27, G. Flügge2, A. Fomenko26, J. Formánek32, J.M. Foster23, G. Franke11, E. Gabathuler20, K. Gabathuler34, F. Gaede27, J. Garvey3, J. Gayler11, M. Gebauer36, R. Gerhards11, A. Glazov36, L. Goerlich6, N. Gogitidze26, M. Goldberg30, B. Gonzalez-Pineiro30 , I. Gorelov25, C. Grab37, H. Grässler2, T. Greenshaw20, R.K. Griffiths21, G. Grindhammer27, A. Gruber27, C. Gruber17, T. Hadig1, D. Haidt11, L. Hajduk6, T. Haller14, M. Hampel1, W.J. Haynes5, B. Heinemann11, G. Heinzelmann13, R.C.W. Henderson19, S. Hengstmann38, H. Henschel36, R. Heremans4, I. Herynek31, K. Hewitt3, K.H. Hiller36, C.D. Hilton23, J. Hladký31, M. Höppner8, D. Hoffmann11, T. Holtom20, R. Horisberger34, V.L. Hudgson3, M. Hütte8, M. Ibbotson23, Ç. İşsever8, H. Itterbeck1, M. Jacquet28, M. Jaffre28, J. Janoth16, D.M. Jansen14, L. Jönsson22, D.P. Johnson4, H. Jung22, P.I.P. Kalmus21, M. Kander11, D. Kant21, U. Kathage17, J. Katzy15, H.H. Kaufmann36, O. Kaufmann15, M. Kausch11, S. Kazarian11, I.R. Kenyon3, S. Kermiche24, C. Keuker1, C. Kiesling27, M. Klein36, C. Kleinwort11, G. Knies11, J.H. Köhne27, H. Kolanoski39, S.D. Kolya23, V. Korbel11, P. Kostka36, S.K. Kotelnikov26, T. Krämerkämper8, M.W. Krasny6,30, H. Krehbiel11, D. Krücker27, A. Küpper35, H. Küster22, M. Kuhlen27, T. Kurča36, B. Laforge9, R. Lahmann11, M.P.J. Landon21, W. Lange36, U. Langenegger37, A. Lebedev26, F. Lehner11, V. Lemaitre11, S. Levonian29, M. Lindstroem22, J. Lipinski11, B. List11, G. Lobo28, G.C. Lopez12, V. Lubimov25, D. Lüke8,11, L. Lytkin14, N. Magnussen35, H. Mahlke-Krüger11, E. Malinovski26, R. Maraček18 , P. Marage4, J. Marks15, R. Marshall23, J. Martens35, G. Martin13, R. Martin20, H.-U. Martyn1, J. Martyniak6, S.J. Maxfield20, S.J. McMahon20, A. Mehta5, K. Meier16, P. Merkel11, F. Metlica14 , A. Meyer13, A. Meyer11, H. Meyer35, J. Meyer11, P.-O. Meyer2, A. Migliori29, S. Mikocki6, D. Milstead20, J. Moeck27, F. Moreau29, J.V. Morris5, E. Mroczko6, D. Müller38, K. Müller11, P. Muŕın18, V. Nagovizin25, R. Nahnhauer36, B. Naroska13, Th. Naumann36, I. Négri24, P.R. Newman3, D. Newton19, H.K. Nguyen30, T.C. Nicholls3, F. Niebergall13, C. Niebuhr11, Ch. Niedzballa1, H. Niggli37, G. Nowak6, T. Nunnemann14, H. Oberlack27, J.E. Olsson11, D. Ozerov25, P. Palmen2, E. Panaro11, A. Panitch4, C. Pascaud28, S. Passaggio37, G.D. Patel20, H. Pawletta2, E. Peppel36, E. Perez9, J.P. Phillips20, A. Pieuchot24, D. Pitzl37, R. Pöschl8, G. Pope7, B. Povh14, K. Rabbertz1, P. Reimer31, H. Rick8, S. Riess13, E. Rizvi11, P. Robmann38, R. Roosen4, K. Rosenbauer1, A. Rostovtsev30, F. Rouse7, C. Royon9, K. Rüter27, S. Rusakov26, K. Rybicki6, D.P.C. Sankey5, P. Schacht27, J. Scheins1, S. Schiek11, S. Schleif16, W. von Schlippe21, D. Schmidt35, G. Schmidt11, L. Schoeffel9, A. Schöning11, V. Schröder11, E. Schuhmann27, H.-C. Schultz-Coulon11, B. Schwab15, F. Sefkow38, A. Semenov25, V. Shekelyan11, I. Sheviakov26, L.N. Shtarkov26, G. Siegmon17, U. Siewert17, Y. Sirois29, I.O. Skillicorn10, T. Sloan19, P. Smirnov26, M. Smith20, V. Solochenko25, Y. Soloviev26, A. Specka29, J. Spiekermann8, S. Spielman29, H. Spitzer13, F. Squinabol28, P. Steffen11, R. Steinberg2, J. Steinhart13, B. Stella33, A. Stellberger16, J. Stiewe16, K. Stolze36, U. Straumann15, W. Struczinski2, J.P. Sutton3, M. Swart16, S. Tapprogge16, M. Taševský32, V. Tchernyshov25, S. Tchetchelnitski25, J. Theissen2, G. Thompson21, P.D. Thompson3, N. Tobien11, R. Todenhagen14, P. Truöl38, G. Tsipolitis37, J. Turnau6, E. Tzamariudaki11, P. Uelkes2, A. Usik26, S. Valkár32, A. Valkárová32, C. Vallée24 , P. Van Esch4, P. Van Mechelen4, D. Vandenplas29, Y. Vazdik26, P. Verrecchia9, G. Villet9, K. Wacker8, A. Wagener2, M. Wagener34, R. Wallny15, T. Walter38, B. Waugh23, G. Weber13, M. Weber16, D. Wegener8, A. Wegner27, T. Wengler15, M. Werner15, L.R. West3, S. Wiesand35, T. Wilksen11, S. Willard7, M. Winde36, G.-G. Winter11, C. Wittek13, M. Wobisch2, H. Wollatz11 , E. Wünsch11, J. Žáček32, J. Zálešák32, D. Zarbock12, Z. Zhang28, A. Zhokin25, P. Zini30, F. Zomer28, J. Zsembery9, and M. zurNedden38, 1 I. Physikalisches Institut der RWTH, Aachen, Germany 2 III. Physikalisches Institut der RWTH, Aachen, Germany 3 School of Physics and Space Research, University of Birmingham, Birmingham, UK 4 Inter-University Institute for High Energies ULB-VUB, Brussels; Universitaire Instelling Antwerpen, Wilrijk; Belgium 5 Rutherford Appleton Laboratory, Chilton, Didcot, UK 6 Institute for Nuclear Physics, Cracow, Poland 7 Physics Department and IIRPA, University of California, Davis, California, USA 8 Institut für Physik, Universität Dortmund, Dortmund, Germany 9 DSM/DAPNIA, CEA/Saclay, Gif-sur-Yvette, France 10 Department of Physics and Astronomy, University of Glasgow, Glasgow, UK 11 DESY, Hamburg, Germany 12 I. Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 13 II. Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 14 Max-Planck-Institut für Kernphysik, Heidelberg, Germany 15 Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany 16 Institut für Hochenergiephysik, Universität Heidelberg, Heidelberg, Germany 17 Institut für Reine und Angewandte Kernphysik, Universität Kiel, Kiel, Germany 18 Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 19 School of Physics and Chemistry, University of Lancaster, Lancaster, UK 20 Department of Physics, University of Liverpool, Liverpool, UK 21 Queen Mary and Westfield College, London, UK 22 Physics Department, University of Lund, Lund, Sweden 23 Physics Department, University of Manchester, Manchester, UK 24 CPPM, Université d’Aix-Marseille II, IN2P3-CNRS, Marseille, France 25 Institute for Theoretical and Experimental Physics, Moscow, Russia 26 Lebedev Physical Institute, Moscow, Russia 27 Max-Planck-Institut für Physik, München, Germany 28 LAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, France 29 LPNHE, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, France 30 LPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, France 31 Institute of Physics, Czech Academy of Sciences of the Czech Republic, Praha, Czech Republic 32 Nuclear Center, Charles University, Praha, Czech Republic 33 INFN Roma 1 and Dipartimento di Fisica, Università Roma 3, Roma, Italy 34 Paul Scherrer Institut, Villigen, Switzerland 35 Fachbereich Physik, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany 36 DESY, Institut für Hochenergiephysik, Zeuthen, Germany 37 Institut für Teilchenphysik, ETH, Zürich, Switzerland 38 Physik-Institut der Universität Zürich, Zürich, Switzerland 39 Institut für Physik, Humboldt-Universität, Berlin, Germany 40 Rechenzentrum, Bergische Universität Gesamthochschule Wuppertal, Wuppertal, Germany a Supported by the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie, FRG, under contract numbers 7AC17P, 7AC47P, 7DO55P, 7HH17I, 7HH27P, 7HD17P, 7HD27P, 7KI17I, 6MP17I and 7WT87P b Supported by the UK Particle Physics and Astronomy Research Council, and formerly by the UK Science and Engineering Research Council c Supported by FNRS-NFWO, IISN-IIKW d Partially supported by the Polish State Committee for Scientific Research, grant no. 115/E343/SPUB/P03/002/97 and grant no. 2P03B 055 13 e Supported in part by US DOE grant DE F603 91ER40674 f Supported by the Deutsche Forschungsgemeinschaft g Supported by the Swedish Natural Science Research Council h Supported by GA ČR grant no. 202/96/0214, GA AV ČR grant no. A1010619 and GA UK grant no. 177 i Supported by the Swiss National Science Foundation j Supported by VEGA SR grant no. 2/1325/96 k Supported by Russian Foundation for Basic Researches grant no. 96-02-00019

The double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA. The cross section is determined as a function of the average transverse jet energyETjets for ranges of the fractional energyξγjets of the parton from the photon side. An effective leading order parton distribution in the photon is determined at large parton fractional energies for scale between 80 <pT2 < 1250 GeV2. The measurement is compatible with the logarithmic scale dependence that is predicted by perturbative QCD.

Di-jet event rates have been measured for deep-inelastic scattering in the kinematic domain 5 < Q 2 < 100 GeV 2 and 10 ?4 < x Bj < 10 ?2 , and for jet transverse momenta squared p 2 t > Q 2. The analysis is based on data collected with the H1 detector at HERA in 1994 corresponding to an integrated luminosity of about 2 pb ?1. Jets are deened using a cone algorithm in the photon-proton centre of mass system requiring jet transverse momenta of at least 5 GeV. The di-jet event rates are shown as a function of Q 2 and x Bj. Leading order models of point-like interacting photons fail to describe the data. Models which add resolved interacting photons or which implement the colour dipole model give a good description of the di-jet event rate. This is also the case for next-to-leading order calculations including contributions from direct and resolved photons.

The electroproduction of ρ mesons with proton diffractive dissociation for Q2 > 7 GeV and the elastic electroproduction of φ mesons for Q2 > 6 GeV are studied in e+p collisions at HERA with the H1 detector, for an integrated luminosity of 2.8 pb−1. The dependence of the cross sections on P 2 t and Q 2 is measured, and the vector meson polarisation obtained. The cross section ratio between proton dissociative and elastic production of ρ mesons is measured and discussed in the framework of the factorisation hypothesis of diffractive vertices. The ratio of the elastic cross section for φ and ρ meson production is investigated as a function of Q2. C. Adloff, S. Aid, M. Anderson, V. Andreev, B. Andrieu, V. Arkadov, C. Arndt, I. Ayyaz, A. Babaev, J. Bähr, J. Bán, P. Baranov, E. Barrelet, R. Barschke, W. Bartel, U. Bassler, H.P. Beck, M. Beck, H.-J. Behrend, A. Belousov, Ch. Berger, G. Bernardi, G. Bertrand-Coremans, R. Beyer, P. Biddulph, J.C. Bizot, K. Borras, F. Botterweck, V. Boudry, S. Bourov, A. Braemer, W. Braunschweig, V. Brisson, D.P. Brown, W. Brückner, P. Bruel, D. Bruncko, C. Brune, J. Bürger, F.W. Büsser, A. Buniatian, S. Burke, G. Buschhorn, D. Calvet, A.J. Campbell, T. Carli, M. Charlet, D. Clarke, B. Clerbaux, S. Cocks, J.G. Contreras, C. Cormack, J.A. Coughlan, M.C. Cousinou, B.E. Cox, G. Cozzika, D.G. Cussans, J. Cvach, S. Dagoret, J.B. Dainton, W.D. Dau, K. Daum, M. David, C.L. Davis, A. De Roeck, E.A. De Wolf, B. Delcourt, M. Dirkmann, P. Dixon, W. Dlugosz, C. Dollfus, K.T. Donovan, J.D. Dowell, H.B. Dreis, A. Droutskoi, J. Ebert, T.R. Ebert, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, E. Elsen, M. Erdmann, A.B. Fahr, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, K. Flamm, M. Fleischer, M. Flieser, G. Flügge, A. Fomenko, J. Formánek, J.M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, F. Gaede, J. Garvey, J. Gayler, M. Gebauer, R. Gerhards, A. Glazov, L. Goerlich, N. Gogitidze, M. Goldberg, K. Golec-Biernat, B. GonzalezPineiro, I. Gorelov, C. Grab, H. Grässler, T. Greenshaw, R.K. Griffiths, G. Grindhammer, A. Gruber, C. Gruber, T. Hadig, D. Haidt, L. Hajduk, T. Haller, M. Hampel, W.J. Haynes, B. Heinemann, G. Heinzelmann, R.C.W. Henderson, H. Henschel, I. Herynek, M.F. Hess, K. Hewitt, K.H. Hiller, C.D. Hilton, J. Hladký, M. Höppner, D. Hoffmann, T. Holtom, R. Horisberger, V.L. Hudgson, M. Hütte, M. Ibbotson, Ç. İşsever, H. Itterbeck, M. Jacquet, M. Jaffre, J. Janoth, D.M. Jansen, L. Jönsson, D.P. Johnson, H. Jung, P.I.P. Kalmus, M. Kander, D. Kant, U. Kathage, J. Katzy, H.H. Kaufmann, O. Kaufmann, M. Kausch, S. Kazarian, I.R. Kenyon, S. Kermiche, C. Keuker, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, T. Köhler, J.H. Köhne, H. Kolanoski, S.D. Kolya, V. Korbel, P. Kostka, S.K. Kotelnikov, T. Krämerkämper, M.W. Krasny, H. Krehbiel, D. Krücker, A. Küpper, H. Küster, M. Kuhlen, T. Kurča, B. Laforge, M.P.J. Landon, W. Lange, U. Langenegger, A. Lebedev, F. Lehner, V. Lemaitre, S. Levonian, M. Lindstroem, F. Linsel, J. Lipinski, B. List, G. Lobo, G.C. Lopez, V. Lubimov, D. Lüke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, E. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, J. Martens, G. Martin, R. Martin, H.-U. Martyn, J. Martyniak, T. Mavroidis, S.J. Maxfield, S.J. McMahon, A. Mehta, K. Meier, P. Merkel, F. Metlica, A. Meyer, A. Meyer, H. Meyer, J. Meyer, P.-O. Meyer, A. Migliori, S. Mikocki, D. Milstead, J. Moeck, F. Moreau, J.V. Morris, E. Mroczko, D. Müller, K. Müller, P. Muŕın, V. Nagovizin, R. Nahnhauer, B. Naroska, Th. Naumann, I. Négri, P.R. Newman, D. Newton, H.K. Nguyen, T.C. Nicholls, F. Niebergall, C. Niebuhr, Ch. Niedzballa, H. Niggli, G. Nowak, T. Nunnemann, H. Oberlack, J.E. Olsson, D. Ozerov, P. Palmen, E. Panaro, A. Panitch, C. Pascaud, S. Passaggio, G.D. Patel, H. Pawletta, E. Peppel, E. Perez, J.P. Phillips,

Low x deep-inelastic ep scattering data, taken in 1994 at the H1 detector at HERA, are analysed in the Breit frame of reference. The evolution of the peak and width of the current hemisphere fragmentation function is presented as a function of Q and compared with e+e− results at equivalent centre of mass energies. Differences between the average charged multiplicity and the multiplicity of e+e− annihilations at low energies are analysed. Invariant energy spectra are compared with MLLA predictions. Distributions of multiplicity are presented as functions of Bjorken-x and Q2, and KNO scaling is discussed.