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1.
The activities of the working group took place under two broad subgroups: Collider Physics subgroup and Flavour Physics subgroup.
Reports on some of the projects undertaken are included. Also, some of the leading discussions organized by the working group
are summarized.
相似文献
2.
Amol Dighe Anirban Kundu K. Agashe B. Anantanarayan A. Chandra A. Datta P. K. Das S. P. Das A. Dighe R. Forty D. K. Ghosh Y. -Y. Keum A. Kundu N. Mahajan S. Majhi G. Mazumdar K. Mazumdar P. Mehta Y. Nir J. P. Saha R. Singh N. Sinha R. Sinha A. Soni S. Uma Sankar R. Vaidya 《Pramana》2004,63(6):1359-1365
This is a report of the low energy and flavour physics working group at WHEPP-8, held at the Indian Institute of Technology,
Mumbai, India, during 5–16 January 2004. 相似文献
3.
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 《Pramana》1998,51(1-2):305-311
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. 相似文献
4.
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 《Pramana》2003,60(2):383-394
The activities of the working group including some of the seminars are summarized. The written reports received are included. 相似文献
5.
Debajyoti Choudhury Rahul Sinha S Arunagiri Gautam Bhattacharyya Debrupa Chakraverty Debajyoti Choudhury Amitava Datta Anindya Datta Aseskrishna Datta Amol Dighe Dilip Kumar Ghosh Anjan Giri Stephen King Anirban Kundu Rukmani Mohanta Biswarup Mukhopadhyaya Sreerup Raychaudhuri Saurabh Rindani Probir Roy DP Roy Sourov Roy AI Sanda Nita Sinha Rahul Sinha K Sridhar H Yamamoto 《Pramana》2000,55(1-2):335-345
This report summarises the work done during WHEPP-6 (Institute of Mathematical Sciences, Chennai, India, Jan 3–15, 2000) in
Working group on ‘B and collider physics’. 相似文献
6.
The contributions made to the Working Group activities on neutrinos and astrophysics are summarized in this article. The topics
discussed were inflationary models in Raman-Sundrum scenarios, ultra high energy cosmic rays and neutrino oscillations in
4 flavour and decaying neutrino models. 相似文献
7.
Naba K. Mondal Saurabh D. Rindani Kaustubh Agashe Pankaj Agrawal B. Ananthanarayan Ketevi Assamagan Alfred Bartl Subhendu Chakrabarti Utpal Chattopadhyay Debajyoti Choudhury Eung-Jin Chun Prasanta K. Das Siba P. Das Amitava Datta Sukanta Dutta Jeff Forshaw Thomas Gajdosik Dilip K. Ghosh Rohini M. Godbole Monoranjan Guchait Partha Konar Sabine Kraml Manas Maity Kajari Mazumdar Naba K. Mondai Biswarup Mukhopadhyaya Meenakshi Narain Santosh K. Rai Sreerup Raychaudhuri Saurabh D. Rindani D. P. Roy Seema Sharma Ritesh K. Singh Rishikesh Vaidya 《Pramana》2004,63(6):1331-1353
This is a summary of the projects undertaken by the working group I on high energy and collider physics. 相似文献
8.
Munshi G Mustafa Sudhir Raniwala T Awes B Rai RS Bhalerao JG Contreras RV Gavai SK Ghosh P Jaikumar GC Mishra AP Mishra H Mishra B Mohanty J Nayak J-Y Ollitrault SC Phatak L Ramello R Ray PK Sahu AM Srivastava DK Srivastava VK Tiwari 《Pramana》2006,67(5):961-981
This is the report of Heavy Ion Physics and Quark-Gluon Plasma at WHEPP-09 which was part of Working Group-4. Discussion and
work on some aspects of quark-gluon plasma believed to have created in heavy-ion collisions and in early Universe are reported. 相似文献
9.
Hsiang Nan Li 《Pramana》2006,67(5):755-762
I discuss some puzzles observed in exclusive B-meson decays, concentrating on the large difference between the direct CP asymmetries in the B
0 → π−
K
= and B
± → π0
K
± modes, the large B
0 → π0π0 branching ratio, and the large deviation of the mixing-induced CP asymmetries in the b → sqq penguins from those in the b → ccs trees. 相似文献
10.
Raj Gandhi Subhendra Mohanty Tarun Souradeep S Agarwalla K Bhattacharya B Brahmachari R Crittenden S Goswami P Ghoshal M Lindner H S Mani S Mitra S Pascoli S Panda R Rangarajan S Ray T Roy Choudhury R Saha S Sarkar A Srivastava R Sheth S Uma Sankar U Yajnik 《Pramana》2006,67(4):735-742
The working group on astroparticle and neutrino physics at WHEPP-9 covered a wide range of topics. The main topics were neutrino
physics at INO, neutrino astronomy and recent constraints on dark energy coming from cosmological observations of large scale
structure and CMB anisotropy. 相似文献
11.
Srubabati Goswami Raghavan Rangarajan K. Agashe A. Bandyopadhyay K. Bhattacharya B. Brahmachari C. Burgess E. J. Chun D. Choudhury P. K. Das A. Dighe R. Godbole S. Goswami N. Gupta M. Kaplinghat D. Indumathi J. Forshaw Y. Y. Keum B. Layek D. Majumdar N. Mahajan P. Mehta R. N. Mohapatra N. Mondai S. More Y. Nir S. Pakvasa M. K. Parida M. Ravikumar G. Rajasekaran P. Ramadevi R. Rangarajan S. D. Rindani D. P. Roy P. Roy N. Sahu A. Samanta Y. Shadmi A. M. Srivastava S. Uma Sankar R. Vaidya U. Yajnik 《Pramana》2004,63(6):1391-1405
This is the report of neutrino and astroparticle physics working group at WHEPP-8. We present the discussions carried out
during the workshop on selected topics in the above fields and also indicate progress made subsequently. The neutrino physics
subgroup studied the possibilities of constraining neutrino masses, mixing and CPT violation in lepton sector from future
experiments. Neutrino mass models in the context of Abelian horizontal symmetries, warped extra dimensions and in the presence
of triplet Higgs were studied. Effect of threshold corrections on radiative magnification of mixing angles was investigated.
The astroparticle physics subgroup focused on how various particle physics inputs affect the CMBR fluctuation spectrum, and
on brane cosmology. This report also contains an introduction on how to use the publicly available code CMBFAST to calculate
the CMBR fluctuations. 相似文献
12.
George W S Hou 《Pramana》2006,67(5):773-782
There are currently two hints for new physics involving CP violation in b → s transitions: ΔS ≡ S
f − S
J
ϕK
≠ 0, and difference in direct CP asymmetry ΔA
Kπ
≡ A
K+π
0
− A
K+π
−
≠ 0. We explore the two scenarios with a large and unique new CP phase in b ↔ s transitions. Motivated by ΔS ≠ 0, we update on the right-handed strange-beauty squark sb
1R at TeV scale. Motivated by ΔA
Kπ
≠ 0, we explore sequential fourth generation t′ and b′ quarks. Both scenarios can survive constraints such as SM level b → sγ, sll and B
s mixing, and predict sizable CP violation in B
s mixing. The fourth generation picture predicts sizable K
L → π
0
vv. Direct search for sb
R, b′ and t′ at hadronic colliders, such as Tevatron Run II and LHC, can complement further CP violation studies at these machines, as
well as at the future Super B factory. 相似文献
13.
Sudhir K Vempati 《Pramana》2000,54(1):133-146
We discuss the various sources of neutrino masses in supersymmetric standard models with explicit lepton number violation.
We show that the bilinear lepton number violating soft terms in models with either bilinear or trilinear lepton number violating
couplings in the superpotential, play an important role in determining the neutrino mass spectrum. A comparative study of
the neutrino mass spectrum and its implications for the present neutrino anomalies in these models is presented. 相似文献
14.
R E Marshak 《Pramana》1988,31(1):9-39
This retrospective paper traces the conceptual evolution of two theories in which the author was involved—the two-meson theory
(with H A Bethe) in 1947 and the universal (V-A) theory of weak interactions (with E C G Sudarshan) in 1957—into the present-day standard model of particle interactions.
Part 1 is entitled ‘From the pion to QCD and pseudo-Goldstone bosons” and Part 2 “From the muon and neutrino to QFD and chiral
anomalies’.
Adapted from two lectures delivered at the University of Rochester in October, 1987. 相似文献
15.
M. W. Evans 《Foundations of Physics Letters》1999,12(1):99-102
It is pointed out that the only possible artifact, free opticalNMR (ONMR) shift of up to 0.1Hz reported by Warrenet al. [1] is the same precisely, 0.1Hz, as that predicted byB
3 theory. However, the great majority of the data by Warrenet al. are almost completely artifactual and cannot be used to discriminate between differentONMR mechanisms with any objectivity. Some references toB
3 theory andrecent ONMR data uncited by Warrenet al. are pointed out, data which show that the Warren group–s failure to see very well known [2,3] polarization-dependent effects
of irradiation inNMR is a major design failure, not one of theory. 相似文献
16.
R. Hanel S. Thurner 《The European Physical Journal B - Condensed Matter and Complex Systems》2008,62(3):327-330
We solve the Unanimity Rule on networks with exponential, uniform and scalefree degree distributions. In particular we arrive
at equations relating the asymptotic number of nodes in one of two states to the initial fraction of nodes in this state.
The solutions for exponential and uniform networks are exact, the analytical approximation for the scalefree case is in perfect
agreement with simulation results. We use these
solutions to provide a theoretical understanding for biodiversity loss in experimental data of foodwebs, which
is available for the three network types discussed. The model allows in principle to estimate the critical value of
species that have to be removed from the system to induce a complete diversity collapse. 相似文献
17.
Amarjit Soni 《Pramana》2004,62(2):415-437
Status of lattice calculations of hadron matrix elements along with CP violation inB and inK systems is reviewed. Lattice has provided useful input which, in conjunction with experimental data, leads to the conclusion
that CP-odd phase in the CKM matrix plays the dominant role in the observed asymmetry inB → ψK
s. It is now quite likely that any beyond the SM, CP-odd, phase will cause only small deviations in B-physics. Search for the
effects of the new phase(s) will consequently require very large data samples as well as very precise theoretical predictions.
Clean determination ofall the angles of the unitarity triangle therefore becomes essential. In this regardB → KD0 processes play a unique role. RegardingK-decays, remarkable progress made by theory with regard to maintenance of chiral symmetry on the lattice is briefly discussed.
First application already provide quantitative information onB
K and the ΔI = 1/2 rule. In the lattice calculation, the enhancement in Re A0 appears to arise solely from tree operators, esp. Q2; penguin contribution toRe A0 appears to be very small. However, improved calculations are necessary for ε’/ε as the contributions of QCD penguins and
electroweak penguins largely seem to cancel. There are good reasons, though, to believe that these cancellations will not
survive improvements that are now underway. Importance of determining the unitarity triangle purely fromK-decays is also emphasized. 相似文献