The H1 detector at HERA

Abt, I.; Ahmed, T.; Aïd, S.; Andreev, V.; Andrieu, Bernard; Appuhn, R. D.; Arnault, C.; Arpagaus, M.; Babaev, A.; Brwolff, H.; Bn, Jin; Banaś, E.; Baranov, P.; Barrelet, E.; Bartel, W.; Bassler, U.; Basti, F.; Baynham, D.E.; Baze, J.M.; Beck, G. A.; Beck, H. P.; Bédérède, D.; Behrend, H. J.; Beigbeder, C.; Belousov, A.; Berger, Ch.; Bergstein, H.; Bernard, R.; Bernardi, G.; Bernet, R.; Bernier, R.; Berthon, U.; Bertrand-Coremans, G.; Besanon, M.; Beyer, R.; Biasci, Jean-Claude; Biddulph, P.; Bidoli, V.; Binder, E.; Binko, P.; Bizot, J.C.; Blobel, V.; Blouzon, F.; Blume, H. T.; Borras, K.; Boudry, V.; Bourdarios, C.; Brasse, F.W.; Braunschweig, W.; Bretón, D.; Brettel, H.; Brisson, V.; Bruncko, D.; Brune, C. R.; Buchner, U.; Bngener, L.; Brger, J.; Bsser, F W.; Buniatian, A.; Bürke, S.; Burmeister, P.; Busata, A.; Buschhorn, G.; Campbell, A.; Carli, T.; Charles, F.; Charlet, M.; Chase, R. L.; Clarke, D.; Clegg, A.B.; Colombo, M.; Commichau, V.; Connolly, J.F.; Cornett, U.; Coughlan, J. 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doi:10.1016/s0168-9002(96)00893-5

Cited by 362 publications

(106 citation statements)

References 37 publications

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“…A detailed description of the H1 detector can be found in [6]. The large rapidity gap method (LRG) is used for selection of the diffractive events which requires the forward detector instrumentation to be devoid of any activity above noise level.…”

Section: Methodsmentioning

confidence: 99%

Diffractive Photoproduction of Dijets in ep Collisions at HERA

C̆erný¹

2008

Proceedings of the XVI International Workshop on Deep-Inelastic Scattering and Related Topics

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Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q 2 < 0.01 GeV 2 ) based on 1999 and 2000 HERA data with integrated luminosity of 54 pb −1 . The event topology is given by ep → eXY , where the system X, containing at least two jets, is separated from a leading low-mass proton dissociative system Y by a large rapidity gap. The measurements are made in two kinematic ranges differing primarily in the transverse energy requirements on the two hardest jets. The dijet cross sections are compared with next-to-leading order QCD predictions based on recent diffractive parton densities obtained by H1. The next-to-leading order calculations predict larger cross sections than measured with the data. The cross section suppression of the data relative to the calculation is found to have no significant dependence on the photon four-momentum fraction entering the hard subprocess. There is a suggestion of a dependence of the suppression factor on the transverse energy of the jets.In photoproduction two basic leading order (LO) classes of photon interactions can be distinguished -direct and resolved. In the direct processes the photon interacts as a pointlike particle. In the resolved processes the photon can develop its partonic structure and acts as a composite particle. In diffractive ep scattering the proton stays intact or dissociates into a low-mass (M Y E cm ) state. The hard diffractive processes can be considered as an exchange of a vacuum quantum number object (Pomeron, IP ). A large gap in the rapidity distribution of the final state hadrons is observed. Owing to the photon structure there is an apparent resemblance between the resolved photoproduction and the hadron-hadron scattering. The factorization of the QCD calculable subprocess from the diffractive parton distribution functions (DPDF) in proton is not expected to hold in the hadron-hadron collisions [2]. The additional rescattering of spectators can fill the large rapidity gap and, therefore, to spoil the experimental signature of the diffractive event. Such a mechanism is expected to explain the difference between the measured structure function extracted from dijet production rates in pp collisions at Tevatron [3] and the theoretical predictions based on the diffractive parton densities by H1. Previous results concerning two jet production in diffractive photoproduction presented by the H1 and ZEUS collaborations can be found in [4] and [5], respectively. In [4] an overall suppression factor of 0.5 is applied to the NLO theory prediction in order to reproduce the measured cross section. In [5] a similar analysis is presented with somewhat higher E T range required on the jets. The global suppression factor of the NLO theory prediction is measured of 0.9 with the use of the same diffractive parton densities as in the case of [4]. The present measurements are based on luminosity of 54 pb −1 which is about a factor of three larger than previous H1 measurement in a similar kinematic domain [4]. * On behalf of the H1...

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Section: Methodsmentioning

confidence: 99%

Diffractive Photoproduction of Dijets in ep Collisions at HERA

C̆erný¹

2008

Proceedings of the XVI International Workshop on Deep-Inelastic Scattering and Related Topics

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“…A detailed description of the H1 detector can be found elsewhere [36][37][38]. Here only the detector components most relevant to the present analysis are briefly described.…”

Section: The H1 Detectormentioning

confidence: 99%

“…The ep luminosity is determined online by measuring the event rate of the Bethe-Heitler bremsstrahlung process, ep → epγ, where the photon is detected in a calorimeter located close to the beam pipe at z = −103 m [36]. The overall integrated luminosity normalisation is determined using a precision measurement of the QED Compton process [45].…”

Section: The H1 Detectormentioning

confidence: 99%

Diffractive dijet production with a leading proton in ep collisions at HERA

Andreev¹,

Baghdasaryan²,

Begzsuren³

et al. 2015

J. High Energ. Phys.

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Abstract:The cross section of the diffractive process e + p → e + Xp is measured at a centre-of-mass energy of 318 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction with photon virtualities Q 2 < 2 GeV 2 and in deep-inelastic scattering with 4 GeV 2 < Q 2 < 80 GeV 2 . The results are compared to nextto-leading order QCD calculations based on diffractive parton distribution functions as extracted from measurements of inclusive cross sections in diffractive deep-inelastic scattering.

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“…The H1 detector is described in detail elsewhere [52]. Here, we give a brief description of the detector components most relevant for the present analysis.…”

Section: H1 Detectormentioning

confidence: 99%

Diffractive jet production in deep-inelastic $e^+p$ collisions at HERA

al.

2001

Eur. Phys. J. C

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A measurement is presented of dijet and 3-jet cross sections in low-|t| diffractive deepinelastic scattering interactions of the type ep → eXY , where the system X is separated by a large rapidity gap from a low-mass baryonic system Y . Data taken with the H1 detector at HERA, corresponding to an integrated luminosity of 18.0 pb −1 , are used to measure hadron level single and double differential cross sections for 4 < Q 2 < 80 GeV 2 , x IP < 0.05 and p T,jet > 4 GeV. The energy flow not attributed to jets is also investigated. The measurements are consistent with a factorising diffractive exchange with trajectory intercept close to 1.2 and tightly constrain the dominating diffractive gluon distribution. Viewed in terms of the diffractive scattering of partonic fluctuations of the photon, the data require the dominance of qqg over qq states. Soft colour neutralisation models in their present form cannot simultaneously reproduce the shapes and the normalisations of the differential cross sections. Models based on 2-gluon exchange are able to reproduce the shapes of the cross sections at low x IP values.

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The H1 detector at HERA

Cited by 362 publications

References 37 publications

Diffractive Photoproduction of Dijets in ep Collisions at HERA

Diffractive Photoproduction of Dijets in ep Collisions at HERA

Diffractive dijet production with a leading proton in ep collisions at HERA

Diffractive jet production in deep-inelastic $e^+p$ collisions at HERA

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