Abstract
Differential dijet cross sections in diffractive deep-inelastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb-1. The selected events are of the type ep → eXY , where the system X contains at least two jets and is well separated in rapidity from the low mass proton dissociation system Y. The dijet data are compared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zℙ (the fraction of the momentum of the diffractive exchange carried by the parton entering the hard interaction) where the gluon density is well determined from the inclusive diffractive data, supporting QCD factorisation. A new set of diffractive parton distribution functions is obtained through a simultaneous fit to the diffractive inclusive and dijet cross sections. This allows for a precise determination of both the diffractive quark and gluon distributions in the range 0.05 < zℙ < 0.9. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions.
Original language | English |
---|---|
Article number | 042 |
Journal | Journal of High Energy Physics |
Volume | 2007 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1 Oct 2007 |
Externally published | Yes |
Keywords
- Lepton-Nucleon Scattering
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In: Journal of High Energy Physics, Vol. 2007, No. 10, 042, 01.10.2007.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Dijet cross sections and parton densities in diffractive DIS at HERA
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AU - Alexa, C.
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AU - Antunovic, B.
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AU - Meyer, A. B.
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AU - Morozov, A.
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AU - Mozer, M. U.
AU - Müller, K.
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AU - Panagoulias, I.
AU - Pandurovic, M.
AU - Papadopoulou, Th
AU - Pascaud, C.
AU - Patel, G. D.
AU - Peng, H.
AU - Perez, E.
AU - Perez-Astudillo, D.
AU - Perieanu, A.
AU - Petrukhin, A.
AU - Picuric, I.
AU - Piec, S.
AU - Pitzl, D.
AU - Plačakyte, R.
AU - Polifka, R.
AU - Povh, B.
AU - Preda, T.
AU - Prideaux, P.
AU - Radescu, V.
AU - Rahmat, A. J.
AU - Raicevic, N.
AU - Ravdandorj, T.
AU - Reimer, P.
AU - Risler, C.
AU - Rizvi, E.
AU - Robmann, P.
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AU - Roosen, R.
AU - Rostovtsev, A.
AU - Rurikova, Z.
AU - Rusakov, S.
AU - Salvaire, F.
AU - Sankey, D. P.C.
AU - Sauter, M.
AU - Sauvan, E.
AU - Schmidt, S.
AU - Schmitt, S.
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AU - Sykora, T.
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AU - Vazdik, Y.
AU - Vinokurova, S.
AU - Volchinski, V.
AU - Weber, G.
AU - Weber, R.
AU - Wegener, D.
AU - Werner, C.
AU - Wessels, M.
AU - Wissing, Ch
AU - Wolf, R.
AU - Wünsch, E.
AU - Xella, S.
AU - Yeganov, V.
AU - Žáček, J.
AU - Zálešák, J.
AU - Zhang, Z.
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AU - Zhokin, A.
AU - Zhu, Y. C.
AU - Zimmermann, T.
AU - Zohrabyan, H.
AU - Zomer, F.
PY - 2007/10/1
Y1 - 2007/10/1
N2 - Differential dijet cross sections in diffractive deep-inelastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb-1. The selected events are of the type ep → eXY , where the system X contains at least two jets and is well separated in rapidity from the low mass proton dissociation system Y. The dijet data are compared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zℙ (the fraction of the momentum of the diffractive exchange carried by the parton entering the hard interaction) where the gluon density is well determined from the inclusive diffractive data, supporting QCD factorisation. A new set of diffractive parton distribution functions is obtained through a simultaneous fit to the diffractive inclusive and dijet cross sections. This allows for a precise determination of both the diffractive quark and gluon distributions in the range 0.05 < zℙ < 0.9. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions.
AB - Differential dijet cross sections in diffractive deep-inelastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb-1. The selected events are of the type ep → eXY , where the system X contains at least two jets and is well separated in rapidity from the low mass proton dissociation system Y. The dijet data are compared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zℙ (the fraction of the momentum of the diffractive exchange carried by the parton entering the hard interaction) where the gluon density is well determined from the inclusive diffractive data, supporting QCD factorisation. A new set of diffractive parton distribution functions is obtained through a simultaneous fit to the diffractive inclusive and dijet cross sections. This allows for a precise determination of both the diffractive quark and gluon distributions in the range 0.05 < zℙ < 0.9. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions.
KW - Lepton-Nucleon Scattering
UR - http://www.scopus.com/inward/record.url?scp=81755173890&partnerID=8YFLogxK
U2 - 10.1088/1126-6708/2007/10/042
DO - 10.1088/1126-6708/2007/10/042
M3 - Article
AN - SCOPUS:81755173890
SN - 1029-8479
VL - 2007
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
IS - 10
M1 - 042
ER -