1. Hadron Collider - Hadron Collider Factories
The potential of hadron colliders to explore the physics of CP violation in B decays is discussed. B physics experiments which have hopes of achieving enough sensitivity to observe and study CP violation and the related topic of B s mixing are being constructed at several locations: at new asymmetric energy e + e Gamma colliders at SLAC 1) and KEK 2) ; at the existing symmetric energy e + e Gamma collider 3) , CESR, at Cornell; at a novel fixed target experiment using the proton beam halo at HERA, the HERA-B experiment 4) ; and in ¯ p Gamma p experiments using upgraded versions of the two `general purpose' detectors, CDF 5) and D0 6) , at the Fermilab Tevatron. This may truly be characterized as...

2. Features of Single Lepton Production at Hadron Collider - Hadron Collider
In the Born approximation, as in the next-to-leading order approximation, Single lepton production p¯p ! l Sigma X at Fermilab Tevatron is discussed. The effects of non standard model physics (W 0 - production) are also considered. It was shown that 2 ! 3 subprocesses play important role when a high transverse momentum cut on the lepton is imposed. On the other hand the NLO corrections do not cause qualitative changes of Born approximation results. The contributions of W 0 bosons for this signature become more important for large values of P cut T . Nearly all experimental data, which are available at present, support the Standard Model as being the correct description of observables at...

3. Study of the Hadron Shower Profiles with the ATLAS Tile Hadron Calorimeter - Hadron Calorimeter,M. Nessi
The lateral and longitudinal profiles of the hadronic showers detected by ATLAS iron-scintillator tile hadron calorimeter with longitudinal tile configuration have been investigated. The results are based on 100 GeV pion beam data. Due to the beam scan provided many different beam impact locations with cells it is succeeded to obtain detailed picture of transverse shower behavior. The underlying radial energy densities for four depthes and for overall calorimeter have been reconstructed. The three-dimensional hadronic shower parametrisation have been suggested. 1 Introduction Hadronic shower is a basic notion of hadron calorimetry. But despite that hadronic shower characteristics are studied for many years the exhaustive quantitative understanding of hadronic shower properties is not...

4. Study of the Hadron Shower Profiles with the ATLAS Tile Hadron Calorimeter - Hadron Calorimeter,M. Nessi
The lateral and longitudinal profiles of the hadronic showers detected by ATLAS iron-scintillator tile hadron calorimeter with longitudinal tile configuration have been investigated. The results are based on 100 GeV pion beam data. Due to the beam scan provided many different beam impact locations with cells it is succeeded to obtain detailed picture of transverse shower behavior. The underlying radial energy densities for four depthes and for overall calorimeter have been reconstructed. The three-dimensional hadronic shower parametrisation have been suggested. 1 Introduction Hadronic shower is a basic notion of hadron calorimetry. But despite that hadronic shower characteristics are studied for many years the exhaustive quantitative understanding of hadronic shower properties is not...

5. Study of the Hadron Shower Profiles with the ATLAS Tile Hadron Calorimeter - Hadron Calorimeter,M. Nessi
The lateral and longitudinal profiles of the hadronic showers detected by ATLAS iron-scintillator tile hadron calorimeter with longitudinal tile configuration have been investigated. The results are based on 100 GeV pion beam data. Due to the beam scan provided many different beam impact locations with cells it is succeeded to obtain detailed picture of transverse shower behavior. The underlying radial energy densities for four depthes and for overall calorimeter have been reconstructed. The three-dimensional hadronic shower parametrisation have been suggested. 1 Introduction Hadronic shower is a basic notion of hadron calorimetry. But despite that hadronic shower characteristics are studied for many years the exhaustive quantitative understanding of hadronic shower properties is not...

6. Study of the Hadron Shower Profiles with the ATLAS Tile Hadron Calorimeter - Hadron Calorimeter,M. Nessi
The lateral and longitudinal profiles of the hadronic showers detected by ATLAS iron-scintillator tile hadron calorimeter with longitudinal tile configuration have been investigated. The results are based on 100 GeV pion beam data. Due to the beam scan provided many different beam impact locations with cells it is succeeded to obtain detailed picture of transverse shower behavior. The underlying radial energy densities for four depthes and for overall calorimeter have been reconstructed. The three-dimensional hadronic shower parametrisation have been suggested. 1 Introduction Hadronic shower is a basic notion of hadron calorimetry. But despite that hadronic shower characteristics are studied for many years the exhaustive quantitative understanding of hadronic shower properties is not...

7. Parity Violating Asymmetries in Top Pair Production at Hadron Colliders - At Hadron Colliders,Chung Kao
We study loop-induced parity violating asymmetries in the strong production of polarized top quark pairs at pp and pp colliders. The electroweak O(ff) corrections to the helicity amplitudes of qq ! t t and gg ! t t are evaluated in a two Higgs doublet model (2HDM) and the minimal supersymmetric standard model (MSSM). While observables in top quark pair production receive little contribution from standard electroweak interactions, it is possible that they can be significantly enhanced in a 2HDM and the MSSM. We find that the one-loop MSSM electroweak corrections can generate parity violating asymmetries in the total production rate of left- and right-handed top quark pairs up...

8. Charmed Particle Production in Hadron-Hadron Collisions
In the framework of Quark--Gluon--String Model developed recently in ITEP we calculate spectra of charmed particles D, D s , c , Xi c ,Omega c in hadron--hadron collisions taking into account the decays of S--wave resonances like D , D s , Sigma c , Sigma c , Xi c , Xi 0 c , andOmega c . We describe the bulk of the existing data on D, D , and c production in ßp and pp collisions and predict the yield of charmed particles in Sigma Gamma p and Xi Gamma p reactions at hyperon beam energies of 340 GeV=c and 600 GeV=c. Because of significant production of baryon resonances our predictions for unfavored fragmentation differ from predictions of...

9. The Large Hadron Collider
INTRODUCTION The CERN Large Hadron Collider will provide protonproton collisions with a centre of mass energy up to 14 TeV with a nominal luminosity of 10 34 cm -2 s -1 and heavy ion (Pb-Pb) collisions with a luminosity of up to 10 27 cm -2 s -1 . The reference design of the LHC has been presented at several conferences and two design reports exist [1, 2]. The main parameters of the machine for proton-proton operation are given in Table 1. In view of the fact that the machine will be installed in the existing 27 km circumference LEP tunnel, considerable technological innovation is needed to fit the two rings into the tunnel cross section whilst leaving enough space for an eventual lepton ring....

10. Hadron Collider - Hadron Collider; Factories Butler
The potential of hadron colliders to explore the physics of CP violation in B decays is discussed. B physics experiments which have hopes of achieving enough sensitivity to observe and study CP violation and the related topic of B s mixing are being constructed at several locations: at new asymmetric energy e + e \Gamma colliders at SLAC 1) and KEK 2) ; at the existing symmetric energy e + e \Gamma collider 3) , CESR, at Cornell; at a novel fixed target experiment using the proton beam halo at HERA, the HERA-B experiment 4) ; and in ¯ p...

11. Remarks on the Strong Coupling Constants in Heavy Hadron Chiral Lagrangians - Hadron Chiral Lagrangians,Hai-yang Cheng
In the heavy quark limit, there are three independent strong axial coupling constants in chiral Lagrangians for ground-state heavy hadrons: g in the meson sector, and g 1 ; g 2 in the baryon sector. The coupling g 2 is extracted from recent CLEO measurements of Sigma c ! c ß to be jg 2 j = 0:57 Sigma 0:10, in agreement with the nonrelativistic quark model expectation but in 2oe deviation from the large-N c argument. The parameter g 1 cannot be determined directly from strong decays of heavy baryons. Nevertheless, some information of g 1 can be learned from the radiative decay Xi 0 0 c ! Xi 0 c...

12. Limits At Hadron Colliders - A. Leike
Simple estimates for Z 0 exclusion limits and Z 0 model measurements in pp (p¯p) collisions are derived. Due to properties of the structure functions, the Z 0 exclusion limits depend only logarithmically on the Z 0 couplings to fermions and on the integrated luminosity. The predicted scaling of Z 0 exclusion limits and errors of Z 0 measurements with the c.m. energy and luminosity allows an easy extrapolation of existing analyses to other colliders. It is well known that Z 0 exclusion limits from e + e Gamma collisions vary strongly with the Z 0 model, while the Z 0 constraints from pp and p¯p collisions show only a weak model dependence [1] - [7]. The mechanisms leading to Z 0 limits in hadron collisions and in e + e Gamma collisions are essentially different....

13. R. Garoby, Bunch Merging and Splitting Techniques in the Injectors for High Energy Hadron Colliders, CERN/PS 98-048. - Hadron Colliders,Ags Pac Tpah
Brennan et at., , i MWAGS proton driver, presented by T. Roser at Snowmass'01 (June 2001), [36] C. McGrew et al., Phys. Rev. D 59, 052004 (1999). [37] F. Arneodo et at., Nuct. Instrum. meth. A471 272-275 (2000) [38] D.B. Cline, F. Sergiampietri, J.G. Learned, K.T. McDonald, LANNDD, A Massive Liquid Argon Detector for Proton Decay, Supernova and Solar Neutrino Studies, and a Neutrino Factory Detector (May 24, 2001), astro-ph/0105442 [39] [40] [41] [42] Also see F. Sergiampietri, On the Possibility to Extrapolate Liquid Argon Technology to a Supermassive Detector for a Future Neutrino Factory, presented at NuFACT'01 (May 26, 2001), M. Diwan, S. Kahn, R.B. Palmer (Brookhaven). Mar 1999. Published in *New York 1999,...

14. Hadron-Antihadron Molecules - T. Barnes
This report summarizes some theoretical and experimental results for hadronic molecules, which are weakly bound states of two or more hadrons. We begin with a brief history of the subject and discuss a few good candidates, from which we abstract four signatures for molecules. Next we consider the possibility that the f 0 (1365) and f 0 (1520) found at LEAR might be vector-vector molecules, and discuss how this might be tested in future experiments. We also discuss the VV and VPs molecule candidates f 0 (1710) and f 1 (1420). Finally we note that a more general understanding of 2 ! 2 hadron scattering amplitudes will...

15. Top-Quark Decay Via Flavor-Changing Neutral Currents at Hadron Colliders - At Hadron Colliders,T. Han,R. D. Peccei,X. Zhang
We study low energy experimental constraints on an anomalous top-quark coupling associated with the flavor-changing neutral current vertex Z ¯ tc. In view of these constraints, we discuss the experimental observability of the induced rare decay mode t ! Zc, both at the Fermilab Tevatron (with the Main Injector or a luminosity-upgrade) and at the LHC. I. INTRODUCTION The existence of the top quark has been established recently at the Fermilab Tevatron by the CDF and D0 collaborations [1] with a measured mass near 175 GeV. Because the top quark is heavier than all other observed fermions and gauge bosons and has a mass of the order of the...

16. QCD and Hadron Dynamics - Yuri Dokshitzer
Introduction Quantum Chromodynamics is a wonder. Take free quarks, supply them with colour degrees of freedom, demand invariance with respect to the "repainting" quark fields arbitrarily in each point in space-time --- and you get the unique QCD Lagrangian describing interacting quarks and gluons. Having done that, you (are supposed to) have the whole hadron world in your hands! Such a beauty and ambition is hard to match. At the same time, it is worth remembering that QCD is probably the strangest of theories in the history of modern physics. On one hand, the striking successes of QCD-based phenomenology leave no doubt that QCD is indeed the microscopic theory of...

17. Quality Limitations of Hadron Beams - Jacques Gareyte
The parameters which characterize the quality of hadron beams in the different accelerators or storage rings most commonly used or in project are reviewed. Owing to the absence of natural damping mechanism, hadron beams require careful manipulations. Some of those are described, in particular the processes used to inject from one machine into another. Among the phenomena which have to be carefully controlled in order to reach the desired performance, special attention is given to space-charge and slow instabilities arising from non-linearities. Presented at Joint CERN-Japan-JINR-Russia-USA Accelerator School, JAS'2000 1 to 14 July 2000 Geneva, Switzerland 17 October 2000 SL/DIV Reps QUALITY LIMITATIONS OF HADRON BEAMS Jacques Gareyte CERN, 1211 Geneva, Switzerland Abstract. The parameters which characterize...

18. Electroweak Measurements from Hadron Machines - Mark Lancaster
this article, the latest experimental electroweak data from hadron machines is reviewed. I have taken a broad definition of a hadron machine to include the results from NuTeV [6] (N collisions) and HERA [7, 8] (ep collisions) as well as the results from the Tevatron (pp collisions). This is not an exhaustive survey of all results [9], but a summary of the new results of the past year and in particular those results which have an influence on the indirect determination of the Higgs mass. This article will cover the direct determinations of the W boson and top quark masses from pp collisions at

19. Study of Hadron Production Models with Hadron Monitors - Micha L Szleper
This note presents a study of pion production spectra at the NuMI target which can be carried out with the use of hadron monitors proposed by the Northwestern group. An example analysis is shown, based on a dedicated GNuMI simulation, and it is discussed whether hadron monitor data can help validate or improve our scarce knowledge of low p T pion production at the NuMI target.

20. Hadron Production Models, Revisited - M. Kostin,R. Zwaska
We present updates on variations in the expected neutrino flux calculated with different hadron production models. We have run the Geant/Fluka, Fluka and MARS code to generate a list of hadrons coming off the target and tracked these through GNUMI.

Página de resultados:
1  2  3  4  5  6  7  8  9  10  Siguiente