Hard QCD at the Tevatron

Mesropian, C.; Do, .

doi:10.1063/1.1664205

Cited by 3 publications

(14 citation statements)

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“…Based on three events, CDF reported for the first time a 95% C.L. upper limit of 410 fb on the cross section,p + p →p + γ + γ + p, [14]. The robustness of the exclusive event selection was checked by a measurement of the purely QED process,p + p →p + e + e − + p, which was found to be in good agreement with the expectation.…”

Section: Leading Baryon Production At Herasupporting

confidence: 70%

“…A still open problem remains, however, of the relevance of hard rescattering corrections both of the spectators and within the hard Higgs boson production amplitude. It is therefore encouraging that the data from Tevatron on exclusive diphoton and dijet production are reasonably well described within the KMR model [14]. An analysis using a Monte-Carlo code DPEMC clearly shows that a model of hard exclusive production based on a non-perturbative approach (originally proposed by Bia las and Landshoff for diffractive Higgs boson production) is not able to describe the invariant mass dependence of the exclusive dijet production [21], see Fig.…”

Section: Dis 2007mentioning

confidence: 99%

“…For the diffractive program at Run II, the CDF collaboration instrumented the detector with special forward components [14] : a Roman Pot spectrometer (RPS) to detect leading antiprotons (improved acceptance for small |t| in comparison to Run Ic), Mini Plug calorimeters to cover the region of about 3.5 < |η| < 5.2, and beam shower counters positioned along the p andp beam directions to tag gaps within 5.5 < |η| < 7.5. In hard single diffraction, CDF obtained preliminary Run II results for the Bjorken-x and Q 2 dependence of the diffractive structure function from the ratio of two dijet samples: single diffractive (SD) dijets triggered by an intact antiproton in the RPS and non-diffractive (ND) dijet events.…”

Section: Leading Baryon Production At Heramentioning

confidence: 99%

“…10, produced in Double Pomeron Exchange (DPE) based on a data sample of about 310 pb −1 collected with a dedicated diffractive trigger in Run II [14]. Exclusive dijet searches use a measurement of the dijet mass fraction, R jj , defined as the ratio of the mass of the two leading jets in an event, M jj , to the total mass, M X .…”

Section: Leading Baryon Production At Heramentioning

confidence: 99%

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Diffraction and Vector Mesons: Summary

Klein¹,

Motyka²

2007

15th International Workshop on Deep-Inelastic Scattering and Related Subjects DIS 2007

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We summarize recent experimental results and theoretical developments related to the topics of diffraction and vector mesons discussed at the DIS2007 Workshop. PrefaceFor nearly two decades, diffractive phenomena studied at the high energy frontier in pp collisions at the Tevatron and in ep collisions at HERA are shaping and challenging our understanding of the underlying dynamical quantum processes. Experimentally, diffractive processes are characterized by large 'rapidity gaps', regions of (pseudo-)rapidity in which no hadrons are produced, and/or by a beam particle (p/p) which remains intact after the scatter. Large gaps in the final state may occur by the exchange of a color singlet object with vacuum quantum numbers, historically referred to as the Pomeron. The spectacular phenomenon of hard diffraction provides a unique way to probe QCD dynamics at low-x and to interpret diffractive reactions by the exchange of partons, mainly gluons, of the interacting nucleon. A particularly exciting feature of diffractive Deep Inelastic Scattering (dDIS) is its relation to unitarity effects in hard QCD scattering amplitudes such as are implemented in modern QCD inspired saturation models and within the k T factorization framework in perturbative QCD (pQCD). An important merit of the k T factorization approach and the saturation model is a unified picture of inclusive and diffractive DIS that they provide. Complementary, in the collinear framework of pQCD, the Operator Product Expansion, inclusive hard diffraction is encoded in diffractive parton densities evolving according to the DGLAP evolution equations. Both frameworks are successfully used to describe data, however, the collinear approach doesn't connect inclusive and diffractive cross sections provided by the S-matrix unitarity.Exclusive diffractive processes are excellent tools to probe the proton structure beyond the reach of inclusive DIS. Exclusive production of mesons, vector mesons and real photons in ep scattering contains combined information about longitudinal momentum distributions of partons and their position on the transverse plane as encoded in Generalized Parton Distribution functions (GPDs). In the high energy and/or very small Bjorken-x regime, exclusive processes can be intimately linked to inclusive DIS in the light-cone color dipole picture. This regime is dominated by the exchange of a hard pQCD Pomeron while data at lower energies are strongly affected by non-vacuum exchanges. A wealth of HERA data established the gross features of the pQCD based description of diffractive vector meson production as for example (Q 2 + M 2 ) as the hard scale for small-t diffraction. The s-channel helicity non-conservation in high energy small-t diffractive scattering may be regarded as one of the important observations at HERA. DIS 2007

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Section: Leading Baryon Production At Herasupporting

confidence: 70%

Section: Dis 2007mentioning

confidence: 99%

Section: Leading Baryon Production At Heramentioning

confidence: 99%

Section: Leading Baryon Production At Heramentioning

confidence: 99%

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Diffraction and Vector Mesons: Summary

Klein¹,

Motyka²

2007

15th International Workshop on Deep-Inelastic Scattering and Related Subjects DIS 2007

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“…The CDF experiment at the Tevatron showed many new diffractive results [19]. The main central CDF detectors (tracker and calorimeter) cover respectively the regions |η| < 2.0 and |η| < 3.6.…”

Section: Diffractive Results From the Tevatronmentioning

confidence: 99%