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1.
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 《Pramana》2003,60(2):405-409
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. 相似文献
2.
Recent analyses of cosmological data suggest the presence of an extra relativistic component beyond the Standard Model content. The Higgs–Dilaton cosmological model predicts the existence of a massless particle – the dilaton – associated with the spontaneous symmetry breaking of scale invariance and undetectable by any accelerator experiment. Its ultrarelativistic character makes it a suitable candidate for contributing to the effective number of light degrees of freedom in the Universe. In this Letter we analyze the dilaton production at the (p)reheating stage right after inflation and conclude that no extra relativistic degrees of freedom beyond those already present in the Standard Model are expected within the simplest Higgs–Dilaton scenario. The elusive dilaton remains thus essentially undetectable by any particle physics experiment or cosmological observation. 相似文献
3.
We study spectral distortions of diffuse ultra-high energy (UHE) neutrino flavour fluxes resulting due to physics beyond the Standard Model (SM). Even large spectral differences between flavours at the source are massaged into a common shape at earth by SM oscillations, thus, any significant observed spectral differences are an indicator of new physics present in the oscillation probability during propagation. Lorentz symmetry violation (LV) and neutrino decay are examples, and result in significant distortion of the fluxes and of the well-known bounds on them, which may allow UHE detectors to probe LV parameters, lifetimes and the mass hierarchy over a broad range. 相似文献
4.
Kyoshi Nishijima 《Radiation Physics and Chemistry》2001,61(3-6):247-253
Super-Kamiokande has accumulated data on atmospheric neutrinos and solar neutrinos for 1117–1289 live days. We present updated results on the flavor ratio, the zenith angle distribution of atmospheric neutrinos and the zenith angle distribution of upward going muons. We also present results on the energy spectrum and the day–night variation of solar neutrinos. The data on atmospheric neutrinos show clear evidence of neutrino oscillation. 相似文献
5.
6.
The existence of cosmic rays of energies exceeding 1020 eV is one of the mysteries of high-energy astrophysics. The spectrum and the high energy to which it extends rule out almost
all suggested source models. The challenges posed by observations to models for the origin of high-energy cosmic rays are
reviewed, and the implications of recent new experimental results are discussed. Large area high-energy cosmic ray detectors
and large volume high-energy neutrino detectors currently under construction may resolve the high-energy cosmic ray puzzle,
and shed light on the identity and physics of the most powerful accelerators in the Universe. 相似文献
7.
We present some physics possibilities with an iron calorimeter detector (ICAL) and a status report on the feasibility study
to construct such a detector at a future possible India-based Neutrino Observatory (INO). This talk was given at the workshop
on high energy physics phenomenology, WHEPP-8, in Jan. 2004, at IIT Bombay. 相似文献
8.
Günter Sigl 《Pramana》2003,60(2):279-289
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. 相似文献
9.
10.
A. Santangelo K. Bittermann T. Mernik F. Fenu 《Progress in Particle and Nuclear Physics》2010,64(2):366-370
The Universe at Ultra-High Energies (UHE) above is largely unexplored. In this paper we focus on the search for UHE neutrinos. After briefly summarizing the science rationale for neutrino studies at UHE, we describe the Extreme Universe Space Observatory (EUSO) onboard the Japanese Experiment Module (JEM) of the International Space Station. 相似文献