Volume 60, Issue 2
February 2003, pages 167-414
pp 167-168 February 2003
pp 169-181 February 2003
We provide a bird’s eyeview of current ideas on supersymmetry breaking mechanisms in the MSSM. The essentials of gauge, gravity, anomaly and gaugino/higgsino mediation mechanisms are covered briefly and the phenomenology of the associated models is touched upon. A few statement are also made on braneworld supersymmetry breaking.
pp 183-188 February 2003
We review proposals of brane world models which attempt to combine gauge theories with gravity at TeV scale by confining the gauge theory to a three-brane embedded in higher dimensional bulk. Gravity, however, propagates in the directions transverse to the brane as well.
pp 189-198 February 2003
Construction of quantum field theory based on operators that are functions of noncommutative space-time operators is reviewed. Examples of Φ4 theory and QED are then discussed. Problems of extending the theories toSU(N) gauge theories and arbitrary charges in QED are considered. Construction of standard model on non-commutative space is then briefly discussed. The phenomenological implications are then considered. Limits on non-commutativity from atomic physics as well as accelerator experiments are presented.
pp 199-208 February 2003
I briefly outline previous work on getting the (supersymmetric) standard model from string theory, and then describe two ecent attempts using D-branes. The first uses D3-and D7-branes and gives a supersymmetric standard model with extra vector-like matter and an intermediate unification scale. The second uses intersecting D4-branes and yields a non-supersymmetric spectrum with TeV-scale unification.
pp 209-214 February 2003
In this paper I will discuss the phenomenology of radion of the Randall-Sundrum type models. I will consider the radion couplings and its production and decay, in the same time taking into account the mixing of radion with Higgs.
pp 215-238 February 2003
I briefly review the Higgs sector in the standard model (SM) and its minimal aupersymmetric extension, the MSSM. After summarizing the properties of the Higgs bosons and the present experimental constraints, I will discuss the prospects for discovering these particle at the upgraded Tevatron, the large hadron collider (LHC) and a high-energye+e− linear collider. The possibility of studying the properties of the Higgs particles will be then summarized.
pp 239-247 February 2003
The large hadron collider (LHC) should have the ability to detect supersymmetric particles if low-energy supersymmetry solves the hierarchy problem. Studies of the LHC detection reach, and the ability to measure properties of supersymmetric particles are currently underway. We highlight some of these, such as the reach in minimal supergravity space and correlation with a fine-tuning parameter, precision measurements of edge variables, anomaly or gauge-mediated supersymmetry breaking. Supersymmetry with baryon-number violation seems at first glance more difficult to detect, but proves to be possible by using leptons from cascade decays.
pp 249-259 February 2003
Results from Super-Kamiokande-I’s entire 1496 live days of solar neutrino data are presented, including the absolute flux, energy spectrum, zenith angle (day/night) and seasonal variation. The possibility of MSW and vacuum oscillations is discussed in light of these results. Results from the first 1289 days of Super-K-I’s atmospheric neutrino analysis are also presented, including the evidence for νμ →ντ oscillations, against νμ → νsterile oscillations, and the current limits on proton decay. Finally, results based on 56 × 1019 protons on target are given for the K2K long-baseline neutrino oscillation experiment.
pp 261-278 February 2003
Neutrino oscillation, in which a given flavor of neutrino transforms into another is a powerful tool for probing small neutrino masses. The intrinsic neutrino properties involved are neutrino mass squared difference Δm2 and the mixing angle in vacuum θ. In this paper I will summarize the progress that we have achieved in our search for neutrino oscillation with special emphasis on the recent results from the Sudbury Neutrino Observatory (SNO) on the measurement of solar neutrino fluxes. I will outline the current bounds on the neutrino masses and mixing parameters and discuss the major physics goals of future neutrino experiments in the context of the present picture.
pp 279-289 February 2003
The highest energy cosmic rays observed possess macroscopic energies and their origin is likely to be associated with the most energetic processes in the universe. Their existence triggered a flurry of theoretical explanations ranging from conventional shock acceleration to particle physics beyond the standard model (SM) and processes taking place at the earliest moments of our universe. Furthermore, many new experimental activities promise a strong increase of statistics at the highest energies and a combination with γ-ray and neutrino astrophysics will put strong constraints on these theoretical models. We give an overview over this quickly evolving research field with focus on testing new particle physics.
pp 291-336 February 2003
It is noted that a set of facts points to the relevance in four dimensions of conventional supersymmetric unification based on minimally a string-unifiedG(224) symmetry, or maximallySO(10). These include: (i) the observed family structure, (ii) quantization of electric charge, (iii) meeting of the three gauge couplings, (iv) neutrino oscillations (in particular the value of δm2(νμ−δτ), suggested by SuperK), (v) the intricate pattern of the masses and mixings of the fermions, including the smallness ofVcb and the largeness ofθμνμτosc, and (vi) the need for B-L as a generator to implement baryogenesis (via leptogenesis). A concrete proposal is presented within a predictiveSO(10)/G(224) framework that successfully describes the masses and mixings of all fermions, including the neutrinos — with eight predictions, all in agreement with observation. Within this framework, a systematic study of proton decay is carried out, which (a) pays special attention to its dependence on the fermion masses, (b) limits the threshold corrections so as to preserve natural coupling unification, and (c) uses recently improved values of the matrix element and renormalization effects. Allowing for both minimal supersymmetric standard model (MSSM) and its proposed variant, the so-called extended supersymmetric standard model (ESSM), as effective low-energy the ories, the study shows that a conservative upper limit on the proton lifetime is about (l–2)× 1034 years, with ·−K+ being the dominant decay mode, and quite possibly μ+K0 ande+π0 being prominent. This in turn strongly suggests that an improvement in the current sensitivity by a factor of five to ten ought to reveal proton decay. For comparison, some alternatives to the conventional approach to unification pursued here are mentioned at the end.
pp 337-344 February 2003
The Belle experiment continues to explore the origin of CP violation and test all aspects of standard model inB meson decays. Recent results on CP violating paramter sin2ф1 and other measurements are presented.
pp 345-351 February 2003
I discuss how supersymmetry affects various observables in B decays, and point out the interesting channels in the context of B factories.
pp 353-362 February 2003
We briefly discuss measurements of angles β and α of the unitarity triangle. We then review rate asymmetries usingSU(3) relationships in the standard model (SM). Some methods to measure angle y usingSU(3) are then discussed. We note that rate forb →sγ can be used to set limits on extra dimensions in which standard model particles propagate.
pp 363-368 February 2003
We propose a novel method for the search of supersymmetry, especially for the electroweak gauginos at the large hadron collider (LHC). Gauge boson fusion technique was shown to be useful for heavy and intermediate mass Higgs bosons. In this article, we have shown that this method can also be applied to find the signals of EW gauginos in supersymmetric theories where the canonical search strategies for these particles fail.
pp 369-376 February 2003
We outline several improvements to the experimental analyses carried out at Tevatron (Run 2) or simulated in view of the large hadron collider (LHC) that could increase the scope of CDF/D0 and ATLAS/CMS in detecting charged Higgs bosons.
pp 377-381 February 2003
We investigate symmetries in Dirac and Majorana mass matrices of neutrinos in a three-generation scenario. We show that if we invokeLe +Lμ-LτxS2R symmetry, one combination of right-handed neutrino states remains massless which can be interpreted as a sterile neutrino. Next we consider a SU2Lx U(1)yx U(l)R gauge model and show how higher-dimensional operators can induce mixing between left- and right-handed states which explains solar, atmospheric and LSND experimental results.
pp 383-394 February 2003
Amitava Datta K Sridhar K Abe K Agashe R Aleksan B C Allanach S Chakraborti D Choudhury Asesh Krishna Datta Anindya Datta D Ghosh R M Godbole M Guchait K Huitu P Konar A Kundu S Moretti B Mukhopadhyaya S Moretti D P Roy
The activities of the working group including some of the seminars are summarized. The written reports received are included.
pp 395-399 February 2003
B Mukhopadhyaya S Raychudhuri K Agashe B Allanach D Bailin B Brahmachari U Chattopadhyay D Choudhury P Das Amitava Datta Anindya Datta A Djouadi A Giri K Huitu A Kundu U Mahanta S Moretti B Mukhopadhyaya J C Pati A K Ray A Raychaudhuri S Raychaudhuri P Roy N Singh R Vaidya
pp 401-404 February 2003
We discuss potential problems in hadronic physics. Recent developments are reviewed and possible future studies in some interesting areas which are underway are highlighted.
pp 405-409 February 2003
Raj Gandhi Kamales Kar S Uma Sankar Abhijit Bandyopadhyay Rahul Basu Pijushpani Bhattacharjee Biswajoy Brahmachari Debrupa Chakraborti M Chaudhury J Chaudhury Sandhya Choubey E J Chun Atri Desmukhya Anindya Datta Gautam Dutta Sukanta Dutta Anjan Giri Sourendu Gupta Srubabati Goswami Namit Mahajan H S Mani A Mukherjee Biswarup Mukhopadhyaya S N Nayak M Randhawa Subhendu Rakshit Asim K Ray Amitava Raychaudhuri D P Roy Probir Roy Suryadeep Roy Shiv Sethi G Sigl Arunansu Sil N Nimai Singh Mark Vagins Urjit Yagnik
This is the report of neutrino and astroparticle physics working group at WHEPP-7. Discussions and work on CP violation in long baseline neutrino experiments, ultra high energy neutrinos, supernova neutrinos and water Cerenkov detectors are discussed.
pp 411-414 February 2003 Special Issue: Proceedings of the Seventh Workshop on High Energy Physics Phenomenology (WHEPP-7)
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