Measurement of the inclusive cross section of jets in γγ interactions at TRISTAN

Hayashii, H.; Miyamoto, A.; Iwasaki, M.; Noguchi, S.; Fujiwara, N.; Abe, Tomohiro; Abe, K.; Adachi, I.; Akiyama, Masashi; Awa, S.; Belusević, R.; Emi, K.; Enomoto, R.; Fujii, Hirofumi; Fujii, Keisuke; Fujii, T.; Fujimoto, J.; Fujita, K.; Howell, B.; Iida, N.; Ikeda, Hirokazu; Itoh, R.; Iwasaki, H.; Kajikawa, R.; Kato, Seiya; Kawabata, S.; Kichimi, H.; Kobayashi, M.; Koltick, D.; Levine, I.; Miyabayashi, K.; Muramatsu, K.; Nagai, K.; Nagira, T.; Nakano, E.; Nakabayashi, K.; Nitoh, O.; Ochiai, F.; Ohnishi, Y.; Okuno, Hiroshi; Okusawa, T.; Shimozawa, K.; Shinohara, T.; Sugiyama, A.; Sugiyama, Naoshi; Suzuki, Shingo; Takahashi, K.; Takahashi, T.; Takemoto, M.; Tanimori, T.; Tauchi, T.; Teramae, F.; Teramoto, Y.; Toomi, N.; Toyama, T.; Tsukamoto, T.; Uno, S.; Watanabe, Y.; Yamaguchi, A.; Yamamoto, A.; Yamauchi, M.

doi:10.1016/0370-2693(93)91335-k

Cited by 48 publications

(23 citation statements)

References 44 publications

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“…The data used in the fits are published data from Refs. [83,84,111,67,112,103,68,69,109,70,110,99,72,71] and preliminary data from Refs. [96,104,113].…”

Section: Parton Distribution Functionsmentioning

confidence: 99%

“…[108] by including more data, and reducing the starting scale to Q 2 0 = 3.0 GeV 2 . Since the data on the photon structure function F γ 2 only indirectly constrain the gluon distribution of the photon, a first attempt was made to fit jet production data from TOPAZ [109,71], and AMY [110], which show some sensitivity to the gluon distribution via the contributions of resolved photon processes to the jet production. However, the data are not precise enough to considerably constrain the gluon distribution function.…”

Section: Parton Distribution Functionsmentioning

confidence: 99%

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The photon structure from deep inelastic electron–photon scattering

2000

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The present knowledge of the structure of the photon is presented with emphasis on measurements of the photon structure obtained from deep inelastic electron-photon scattering at e + e − colliders. This review covers the leptonic and hadronic structure of quasi-real and also of highly virtual photons, based on measurements of structure functions and differential cross-sections. Future prospects of the investigation of the photon structure in view of the ongoing LEP2 programme and of a possible linear collider are addressed. The most relevant results in the context of measurements of the photon structure from photon-photon scattering at LEP and from photonproton and electron-proton scattering at HERA are summarised.

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“…The data used in the fits are published data from Refs. [83,84,111,67,112,103,68,69,109,70,110,99,72,71] and preliminary data from Refs. [96,104,113].…”

Section: Parton Distribution Functionsmentioning

confidence: 99%

Section: Parton Distribution Functionsmentioning

confidence: 99%

The photon structure from deep inelastic electron–photon scattering

2000

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“…The two-body phase space in the case of initial state singularities is given by (19). Expressing the resolved matrix elements H 6 , .…”

Section: Parton Initial State Singularities In the Dr Casementioning

confidence: 99%

“…The region of high center of mass energies is of special interest for obtaining information beyond the low E T region that is determined by soft physics. This has been measured at LEP [18] and TRISTAN [19]. Comparison of the data in [19] with theoretical predictions using similar methods as those employed in [14] can be found in [13,20,21] for real photons.…”

Section: Introductionmentioning

confidence: 99%

Inclusive Single- and Dijet Rates in Next-to-Leading Order QCD for γp and γγ Collisions

Pötter

2000

EPJ direct

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We present one-and two-jet inclusive cross sections for γ * γ scattering and virtual photoproduction in ep collisions. The hard cross sections are calculated in next-to-leading order QCD. Soft and collinear singularities are extracted using the phase-space-slicing method. The initial state singularity of the virtual photon depends logarithmically its' virtuality. This logarithm is large and has to be absorbed into the parton distribution function of the virtual photon. We define for this purpose an MS factorization scheme similar to the real photon case. We numerically study the dependence of the inclusive cross sections on the transverse energies and rapidities of the outgoing jets and on the photon virtuality. The ratio of the resolved to the direct cross section in ep collisions is compared to ZEUS data. under Contract 05 7 HH 92P (0), and by EEC Program Human Capital and Mobility through Network Physics at High Energy Colliders under Contract CHRX-CT93-0357 (DG12 COMA). Recently, data has been presented by the ZEUS [23] and the H1 [24] collaborations for electron-proton collisions involving photons with small, but notvanishing P 2 that allow a test of the virtual photon structure. So far, there has only been one measurement of the virtual photon structure function from the PLUTO collaboration at the PETRA e + e − collider [25]. In [26] we made a comparison of theoretical NLO predictions for γ * p inclusive jet production with data from [23], by extending the methods used in [11,12]. This extension will be described in detail in this work. Some theoretical studies of inclusive γ * p cross sections in LO have been presented in [27,28,29]. We also include the case of γ * γ scattering that will become important at LEP2 [30], which is an extension of the work from [20,21].Since the partonic subprocesses of ep and γ * γ scattering are very similar, we will take over the notation 'SR' and 'DR' from the γγ case to ep scattering to simplify the discussion. In ep scattering, the SR component denotes the contribution, where the virtual photon is directly interacting with the partons from the proton, whereas in the DR component the resolved photon interacts with the partons from the proton.The extension from real to virtual photoproduction is done by taking the Weizsäcker-Williams formula to describe the momentum spread of the virtual photon, but keeping P 2 fixed, not integrating over the region of small P 2 and not assuming P 2 = 0. This is described by the unintegrated Weizsäcker-Williams formula. In the hard process, the matrix elements for finite P 2 have to be taken. The matrix elements and the initial and final state singularities for the SR contribution with P 2 = 0 have been calculated in [31,32] in connection with deepinelastic ep scattering (DIS) at HERA, where P 2 is large. Since we consider P 2 to be finite, the photon initial state singularities encountered in real photoproduction do not occur. Instead, when integrating over the phase-space of the final state particles, a logarithm of the type ln(P 2 /E 2 T...

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“…The rst experimental evidence for a non zero gluon content came from AMY [38]. Single jet and dijet inclusive cross sections have then been measured by both TOPAZ [39] and AMY [40]. The results of TOPAZ compared to theoretical predictions are shown in Fig.…”

mentioning

confidence: 98%

Optical spectroscopy of trapped neutral atoms

Gabbanini¹

1997

Riv. Nuovo Cim.

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The study of photoproduction reactions has gained a unique opportunity with the HERA data. The high center of mass energy allows to carry out quantitative tests of QCD, to explore the substructure of both the photon and the proton and to shed new light on soft and diractive processes. In this report we review the HERA results, comparing them with the reach of xed target photoproduction experiments and complementary measurements from e + e and hadron colliders.

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Measurement of the inclusive cross section of jets in γγ interactions at TRISTAN

Cited by 48 publications

References 44 publications

The photon structure from deep inelastic electron–photon scattering

The photon structure from deep inelastic electron–photon scattering

Inclusive Single- and Dijet Rates in Next-to-Leading Order QCD for γp and γγ Collisions

Optical spectroscopy of trapped neutral atoms

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Measurement of the inclusive cross section of jets in γγ interactions at TRISTAN

Cited by 48 publications

References 44 publications

The photon structure from deep inelastic electron–photon scattering

The photon structure from deep inelastic electron–photon scattering

Inclusive Single- and Dijet Rates in Next-to-Leading Order QCD for γ*p and γ*γ Collisions

Optical spectroscopy of trapped neutral atoms

Contact Info

Product

Resources

About

Inclusive Single- and Dijet Rates in Next-to-Leading Order QCD for γp and γγ Collisions