Details

Autor(en) / Beteiligte

• Adloff, C.
• Andreev, V.
• Andrieu, B.
• Arkadov, V.
• Astvatsatourov, A.
• Ayyaz, I.
• Babaev, A.
• Bahr, J.
• Baranov, P.
• Barrelet, E.
• Bartel, W.
• Bassler, U.
• Bate, P.
• Beglarian, A.
• Behnke, O.
• Behrend, H.J.
• Beier, C.
• Belousov, A.
• Berger, C.
• Bernardi, G.
• Berndt, T.
• Bertrand-Coremans, G.
• Biddulph, P.
• Bizot, J.C.
• Boudry, V.
• Braunschweig, W.
• Brisson, V.
• Brown, D.P.
• Bruckner, W.
• Bruel, Pascal
• Bruncko, D.
• Burger, J.
• Busser, F.W.
• Buniatian, A.
• Burke, S.
• Burrage, A.
• Buschhorn, G.
• Calvet, D.
• Campbell, A.J.
• Carli, T.
• Chabert, E.
• Charlet, M.
• Chyla, J.
• Clarke, D.
• Clerbaux, B.
• Contreras, J.G.
• Cormack, C.
• Coughlan, J.A.
• Cousinou, M.C.
• Cox, B.E.
• Cozzika, G.
• Cvach, J.
• Dainton, J.B.
• Dau, W.D.
• Daum, K.
• David, M.
• Davidsson, M.
• de Roeck, A.
• de Wolf, E.A.
• Delcourt, B.
• Demirchian, R.
• Diaconu, C.
• Dirkmann, M.
• Dixon, P.
• Dlugosz, W.
• Donovan, K.T.
• Dowell, J.D.
• Droutskoi, A.
• Ebert, J.
• Eckerlin, G.
• Eckstein, D.
• Efremenko, V.
• Egli, S.
• Eichler, R.
• Eisele, F.
• Eisenhandler, E.
• Elsen, E.
• Enzenberger, M.
• Erdmann, M.
• Fahr, A.B.
• Faulkner, P.J.W.
• Favart, L.
• Fedotov, A.
• Felst, R.
• Feltesse, J.
• Ferencei, J.
• Ferrarotto, F.
• Fleischer, M.
• Flugge, G.
• Fomenko, A.
• Formanek, J.
• Foster, J.M.
• Franke, G.
• Gabathuler, E.
• Gabathuler, K.
• Gaede, F.
• Garvey, J.
• Gassner, J.
• Gayler, J.
• Gerhards, R.

Titel

Measurement of Dijet Cross-Sections at Low $Q^{2}$ and the Extraction of an Effective Parton Density for the Virtual Photon

Ist Teil von

• The European physical journal. C, Particles and fields, 2000, Vol.13, p.397-414

Ort / Verlag

Springer Verlag (Germany)

Erscheinungsjahr

2000

Link zum Volltext

Quelle

SpringerLink (Online service)

Beschreibungen/Notizen

• The triple-differential dijet cross-section, d^3 sigma_{ep}/dQ2 dE_t2 dxgjets, is measured with the H1 detector at HERA as a function of the photon virtuality Q^2, the fraction of the photon's momentum carried by the parton entering the hard scattering, xgjets, and the square of the mean transverse energy, E_t2, of the two highest E_t jets. Jets are found using a longitudinal boost-invariant k_T clustering algorithm in the gamma* p center of mass frame. The measurements cover the ranges 1.6 Q^2 80 GeV$^2 in virtuality and 0.1 y 0.7 in inelasticity y. The results are well described by leading order QCD models which include the effects of a resolved component to the virtual photon. Models which treat the photon as point-like fail to describe the data. An effective leading order parton density for the virtual photon is extracted as a function of the photon virtuality, the probing scale and the parton momentum fraction. The x_gamma and probing scale dependences of the parton density show characteristic features of photon structure, and a suppression of this structure with increasing Q^2 is seen.