Volume 51, Issue 1-2
July 1998, pages 1-316
pp 1-4 July 1998
pp 5-6 July 1998
pp 7-26 July 1998
I start with a brief introduction to Higgs mechanism and supersymmetry. Then I discuss the theoretical expectations, current limits and search strategies for Higgs boson(s) at LHC — first in the SM and then in the MSSM. Finally I discuss the signatures and search strategies for the superparticles.
pp 27-37 July 1998
The inflationary Universe resolves some of the most outstanding issues of standard cosmology including the horizon and flatness problems and the origin of density fluctuations in the Universe. Inflationary models also predict the existence of a relic gravity wave background. Both gravity waves and density fluctuations induce fluctuations in the cosmic microwave background (CMB), the discovery of large angle anisotropies in the CMB having the scale invariant spectrum predicted by inflationary models has fuelled the hope that the inflationary scenario may indeed provide the correct description of the very early Universe. Upcoming large scale galaxy surveys (SDSS & 2dF) and CMB missions (MAP, Planck Surveyor) will further probe the inflationary scenario by throwing light on the origin and evolution of large scale structure in the Universe.
pp 39-43 July 1998
This is a short summary of the systematics observed in various heavy-ion experiments at CERN SPS energies.
pp 45-50 July 1998
Given the particle content of the standard model without and with a right-handed neutrino, the requirement that all anomalies cancel singles out a set of possible global symmetries which can be gauged. I review this topic and propose a new gauge symmetryB — 3LT in the context of the minimal standard model consisting of the usual three families of quarks and leptons plus just onevR. The many interesting phenomenological consequences of this hypothesis are briefly discussed.
pp 51-64 July 1998
All the possible schemes of neutrino mixing with four massive neutrinos inspired by the existing experimental indications in favour of neutrino mixing are considered. It is shown that the scheme with a neutrino mass hierarchy is not compatible with the experimental results, likewise all other schemes with the masses of three neutrinos close together and the fourth mass separated by a gap needed to incorporate the LSND neutrino oscillations. Only two schemes with two pairs of neutrinos with close masses separated by this gap of the order of 1 eV are in agreement with the results of all experiments. We carefully examine the arguments leading to this conclusion and also discuss experimental consequences of the two favoured neutrino schemes.
pp 65-76 July 1998
In this article, we review some of the recent results from CDF and DØ experiments at the Tevatron and their prospects at the upgrade. Among the topics discussed are top quark physics, electroweak physics, qcd physics and new physics beyond standard model.
pp 77-86 July 1998
We summarize here the recent results from the four experiments at the large electron positron collider (LEP). These experiments provide precise measurements of theW and Z boson properties and their couplings to leptons and quarks. These measurements, together with measurements of the top quark andW boson masses in the Tevatron collider provide a stringent test of the standard electroweak theory. Searches for Higgs boson and supersymmetric particles have yielded null results so far giving rise to lower bounds in the parameter space.
pp 87-106 July 1998
This write-up gives a rather elementary introduction into particle physics aspects of the cosmological dark matter puzzle. A fairly comprehensive list of possible candidates is given; in each case the production mechanism and possible ways to detect them (if any) are described. I then describe detection of the, in my view, most promising candidates, weakly interacting massive particles or WIMPs, in slightly more detail. The main emphasis will be on recent developments.
pp 107-122 July 1998
Results of the HERA experiments HERMES, HI and ZEUS obtained in 1997 are presented. They cover recent measurements on the proton structure functionF2, the extraction of the gluon density, which is compared with open charm production, diffractive scattering and results on the proton spin structure. We further give an update on the NC events at very highQ2 and report on an observation of events with an isolated lepton and missingpt.
pp 123-133 July 1998
I discuss the theoretical motivations forR-parity violation, review the experimental bounds and outline the main changes in collider phenomenology compared to conservedR-parity.
pp 135-143 July 1998
I review the constraints on the mass of gravitinos that follow from considerations on energy loss in stars and from big bang nucleosynthesis arguments.
pp 145-156 July 1998
I review inclusive charmonium production at the high-energy colliders Tevatron and HERA.
pp 157-167 July 1998
We review some theoretical developments concerning higher order QCD corrections to the bremsstrahlung cross-section and the problems raised by the definition of isolated cross sections. Then we discuss recent phenomenological analyses of direct photon fixed target data.
pp 169-180 July 1998
A review of the Higgs and neutralino sector of supersymmetric models is presented. This includes the upper limit on the mass of the lightest Higgs boson in the minimal supersymmetric standard model, as well as models based on the standard model gauge groupSU(2)L xU(l)Y with extended Higgs sectors. We then discuss the Higgs sector of left-right supersymmetric models, which conserveR-parity as a consequence of gauge invariance, and present a calculable upper bound on the mass of the lightest Higgs boson in these models. We also discuss the neutralino sector of general supersymmetric models based on the SM gauge group. We show that, as a consequence of gauge coupling unification, an upper bound on the mass of the lightest neutralino as a function of the gluino mass can be obtained.
pp 181-190 July 1998
The observable consequences of gauge-mediated supersymmetry breaking (GMSB) are reviewed here. Implications of scenarios both with a neutralino and a slepton as the next lightest supersymmetric particle (NLSP) are surveyed in relation to hadronic ande+e- colliders. We also discuss the phenomenological consequences of the NLSP decaying slowly, giving rise to delayed events in the detectors.The importance of distinguishing signals of GMSB models from those of the commonly discussed supergravity-type theories is emphasized.
pp 191-204 July 1998
Many particle physics models of matter admit solutions corresponding to stable or long-lived topological defects. In the context of standard cosmology it is then unavoidable that such defects will form during phase transitions in the very early Universe. Certain types of defects lead to disastrous consequences for cosmology, others may play a useful role, as possible seeds for the formation of structure in the Universe, or in mediating baryon number violating processes. In all cases, topological defects lead to a fruitful interplay between particle physics and cosmology.
pp 205-216 July 1998
In this talk I review the behaviour of structure functions at low values of Bjorkenx and discuss the theoretical underpinnings with particular attention to resummation schemes. I present the need for ‘less inclusive’ events to distinguish between various resummation schemes and discuss the various difficulties in differentiating experimentally between different schemes.
pp 217-228 July 1998
After giving a very brief introduction to the resolved photon processes, I will summarize the latest experimental information from HERA, on resolved photon contribution to largepT jet production as well as to direct photon production. I will point out the interesting role that resolved photon processes can play in increasing our understanding of the dynamics of the quarkonium production. I will then discuss the newer information on the parton content of virtual photons as well as thekT distribution of the partons in the photon. I will end by giving predictions of an eikonalized minijet model for σγγinel which crucially uses the experimental measurement of the abovementionedkT distribution and comparing them with data.
pp 229-237 July 1998
I summarize some astrophysical phenomenon like gamma ray bursters, astrophysical proof of the existence of blackholes, Active galactic nuclei — as high energy neutrino sources, and some unsolved issues in supernova. I touch on the aspects where novel particle properties (like neutrino mass and magnetic moment) are invoked to understand the astronomical observations.
pp 239-248 July 1998
In the search for phenomenological evidence of supersymmetry through the indirect method of quantum signatures, it is useful to seek correlations of the non-standard quantum effects in low and high energy proceses, such as those involving on one hand the properties of theB-mesons and on the other hand the physics of the top quark and of the Higgs bosons. There are regions of the MSSM parameter space where the potential quantum SUSY signatures in the two energy regimes are strongly interwoven and therefore the eventual detection of these correlated quantum effects would strongly point towards the existence of underlying supersymmetric dynamics.
pp 249-271 July 1998
The physics at the plannede+e- colliders is discussed around three main topics corresponding to different manifestations of symmetry breaking:W physics in the no Higgs scenario, studies of the properties of the Higgs and precision tests of SUSY. A comparison with the LHC is made for all these cases. The γγ mode of the linear collider will also be reviewed.
pp 273-286 July 1998
Subhendra Mohanty Varun Sahni S Chakraborty Ashok Goyal Sukanta Dutta Debajyoti Choudhury Shobhit Mahajan Amitabha Mukherjee Hatem Widyan Urjit Yajnik S Mohanty J A Grifols Uma Mahanta Sarira Sahu Varun Sahni Tarun Souradeep Albert Stebbins Ioav Waga Vikram Soni N Panchapakesan R Brandenberger
The astroparticle physics working group witnessed intense discussion and activity covering a broad range of topics ranging from supergravity and baryogenesis to compact stars and the large scale structure of the Universe. A summary of some of the subject areas in which collaborations were initiated during WHEPP-5 is presented below.
pp 287-295 July 1998
pp 297-304 July 1998
K Sridhar Sunanda Banerjee Swagato Banerjee Rahul Basu Fawzi Boudjema Michel Fontannaz Rajiv Gavai J Gayler Rohini Godbole Sourendu Gupta D Indumathi Michael Krämer Prakash Mathews Hiranmaya Mishra P Poulose Probir Roy K Sridhar
pp 305-311 July 1998
Debajyoti Choudhury Saurabh D Rindani B Ananthanarayan K R S Balaji Debajyoti Choudhury Manuel Drees Shashikant Dugad Gautam Dutta Sukanta Dutta Naveen Gaur Ambar Ghosal Walter Grimus Ernest Ma Shubhendra Mohanty P N Pandita M K Parida Subhendu Rakshit Saurabh D Rindani D P Roy Probir Roy Sarira Sahu N N Singh Sudhir K Vempati Francesco Vissani
This report summarises the activities of the working group on ‘Physics beyond the Standard Model’. The results of investigations in incorporatingR-parity in grand unification, the possibility of a light charged Higgs boson in extension of MSSM and radiative generation of neutral vector boson self-couplings within the MSSM are described. Also given is an account of activities in neutrino physics, namely a proposal for a study of the atmospheric muon anomaly in deep underground mines, a field theoretic study of neutrino oscillations and a mechanism to generate appropriate masses of three active plus one sterile neutrino species.
pp 313-316 July 1998
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