共查询到20条相似文献,搜索用时 0 毫秒
1.
The LHC physics program at CERN addresses some of the fundamental issues in particle physics and CMS experiment would concentrate
on them. The CMS detector is designed for the search of Standard Model Higgs boson in the whole possible mass range. Also
it will be sensitive to Higgs bosons in the minimal supersymmetric model and well adapted to searches for SUSY particles,
new massive vector bosons, CP-violation in B-system, search for subtructure of quarks and leptons, etc. In the LHC heavy ion collisions the energy density would be well
above the threshold for the possible formation of quark-gluon plasma. 相似文献
2.
Recent results from the LEP collider at CERN are presented: on the identification of e
+
e
− → W
+
W
− and the determination of the W mass and width and limits on its anomalous couplings; the search for the Standard Model and non-minimal Higgs; search for
SUSY and other new particles. Fits to all electroweak data leading to predictions of the Higgs mass within the Standard Model
are presented. 相似文献
3.
We explore the possibility of distinguishing the SM-like MSSM Higgs boson from the SM Higgs boson via Higgs boson pair production
at future muon collider. We study the behavior of the production cross-section in SM and MSSM with Higgs boson mass for various
MSSM parameters tan β and m
A
. We observe that at fixed CM energy, in the SM, the total cross-section increases with the increase in Higgs boson mass whereas
this trend is reversed for the MSSM. The changes that occur for the MSSM in comparison to the SM predictions are quantified
in terms of the relative percentage deviation in cross-section. The observed deviations in cross-section for different choices
of Higgs boson masses suggest that the measurements of the cross-section could possibly distinguish the SM-like MSSM Higgs
boson from the SM Higgs boson.
相似文献
4.
P. Poulose 《Pramana》2007,69(5):909-913
Among the viable alternatives to the standard Higgs mechanism is the recently proposed Little Higgs model. The advantage here
is that the model has an elementary light neutral scalar particle, which arises dynamically as against its ad hoc introduction in the standard model. The model also avoids hierarchy problem. We have investigated the W pair production at ILC to study the littlest Higgs model using different observables. Specifically, polarization fraction
of W boson is expected to be measured very accurately at ILC. We use this to put limit on the scale parameter, f, in the model.
相似文献
5.
Mohammad Sami 《Pramana》1982,18(5):451-460
The associated production of Higgs particles andZ (W) bosons inpp and
collisions is studied. The total cross-section of the processpp
→HXl
+
l
− is estimated. 相似文献
6.
7.
Jörg Gayler 《Pramana》1998,51(1-2):107-122
Results of the HERA experiments HERMES, HI and ZEUS obtained in 1997 are presented. They cover recent measurements on the
proton structure functionF
2, 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 highQ
2 and report on an observation of events with an isolated lepton and missingp
t. 相似文献
8.
We review the currently most accurate evaluation of the W boson mass, M
W
, in the minimal supersymmetric standard model (MSSM). It consists of a full one-loop calculation, including the complex phase
dependence, all available MSSM two-loop corrections as well as the full standard model result. We analyse the impact of the
phases in the scalar quark sector on M
W
and compare the prediction for M
W
based on all known higher-order contributions with the experimental results.
相似文献
9.
Contact-like nonstandard interactions can be revealed only through deviations of observables from the standard model (SM)
predictions. We consider a number of such nonstandard scenarios, and discuss their identification as sources of deviations
in fermion-pair production processes at the international linear collider (ILC), if they were observed. We emphasize the role
of e
− and e
+ polarization in enhancing the identification reaches.
相似文献
10.
C. Bini 《The European Physical Journal A - Hadrons and Nuclei》2007,31(4):446-450
The KLOE experiment at the Frascati e
+
e
- collider DAFNE has completed this year its data taking. An integrated luminosity of 2.7fb^-1 has been collected mostly at
the φ-resonance peak. A wide experimental program is in progress. The detection of φ radiative decays allows to study the properties of the lowest-mass scalar and pseudoscalar mesons and to obtain information
on their structure. The main results are reviewed together with the prospects for low-energy e
+
e
- physics at Frascati. 相似文献
11.
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
12.
Saurabh D. Rindani 《Pramana》2007,69(5):883-887
With the use of transverse polarization (TP), a CP-odd and T-odd observable can be constructed when the final-state particles
are self-conjugate. In the case of HZ production, this observable can be used to probe a certain effective four-point e
+
e
−
ZH CP-violating coupling, not accessible without TP. Effective CP-violating ZZH coupling does not contribute to this observable. A similar observable in γZ production can be used to probe e
+
e
−
γZ four-point couplings.
相似文献
13.
K. D. Stefanov 《Pramana》2007,69(6):1001-1008
The Linear Collider Flavour Identification (LCFI) collaboration is continuing the work to develop column-parallel CCDs (CPCCD)
and CMOS readout chips to be used in the vertex detector at the international linear collider (ILC). The CPCCD achieves several
orders of magnitude faster readout than conventional CCDs because every column is equipped with amplifier and ADC, enabling
efficient data taking with low occupancy. Already two generations of CPCCDs and readout chips have been manufactured and the
first chips have been fully tested. The second generation devices are now being evaluated. A new CCD-based device, the in-situ
storage image sensor (ISIS) has also been developed. The ISIS offers numerous advantages in terms of relaxed readout, increased
radiation hardness and great immunity to EMI. In this paper we present the results from the tests of the CPCCDs, readout chips
and ISIS, as well as the plans for future developments.
for the Linear Collider Flavour Identification (LCFI) Collaboration 相似文献
14.
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
15.
Bin Zhang 《The European Physical Journal C - Particles and Fields》2009,62(1):25-29
The parton-cascade model is a microscopic transport approach in the study of the space-time evolution of the quark–gluon plasma
produced in relativistic heavy-ion collisions and its experimental manifestations. In the following, parton-cascade calculations
on elliptic flow and thermalization will be discussed. Dynamical evolution is shown to be important for the production of
elliptic flow including the scaling and the breaking of the scaling of elliptic flow. The degree of thermalization is estimated
using both an elastic parton-cascade and a radiative transport model. A longitudinal to transverse pressure ratio of P
L
/P
T
≈0.8 is shown to be expected in the central cell in central collisions. This provides information on viscous corrections to
the ideal hydrodynamical approach. 相似文献
16.
B. Ananthanarayan 《Pramana》2007,69(5):849-854
At the international linear collider large beam polarization of both the electron and positron beams will enhance the signature
of physics due to interactions that are beyond the standard model. Here we review our recently obtained results on a general
model-independent method of determining for an arbitary one-particle inclusive state the space-time structure of such new
physics through the beam polarization dependence and angular distribution of the final state particle.
相似文献
17.
We point out that the equivalent-photon approximation (EPA) for processes with massive spin-1 particles in the final state would have validity in a more restricted kinematic domain
than for processes where it is commonly applied, viz., those with spin-1/2 or spin-0 particles in the final state. We obtain
the criterion for the validity ofEPA for the two-photon production of a pair of charged, massive, point-like spin-1 particlesV
±, each of massM and with a standard magnetic moment (κ=1). In a process in which one of the photons is real and the other virtual with four-momentumq, the condition for the validity ofEPA is |q
2|≪M
2, in addition to the usual condition |q
2|≪W
2,W being theV
+
V
− invariant mass. In a process in which both photons are virtual (with four-momentaq andq′), our condition is |q
2||q′2|W
4 ≪ 16M
8, in addition to |q
2| ≪M
2, |q′2| ≪M
2 and |q
2| ≪W
2, |q′2| ≪W
2. Even when these extra conditions permitting the use ofEPA are not fulfilled, convenient approximate expressions may still be obtained assuming merely |q
2| ≪W
2 and |q′2| ≪W
2.
We also discuss how the extra conditions are altered when the vector bosons are incorporated in a spontaneously broken gauge
theory. Examples ofW boson production in Weinberg-Salam model are considered for which the condition |q
2||q′2|W
4 ≪ 16M
8 is shown to be removed. 相似文献
18.
Y P Viyogi 《Pramana》2000,54(4):589-602
We describe the important results from the recent experiments using lead beams at the CERN SPS. The results of the WA98 experiment,
which has substantial Indian participation along with the photon multiplicity detector is described in some detail. Combining
the preliminary results from various experiments looking at different signals of phase transition, one finds enough evidences
to suggest that phase transition has taken place in nuclear collisions at the SPS. Future programme of heavy ion physics at
the LHC is being greared around the ALICE experiment. This will comprise of detector subsystems capable of studying almost
all the signals in the same event. The photon multiplicity detector will be an important component of the ALICE experiment,
being a totally Indian contribution to ALICE. 相似文献
19.
20.
The effect of including the high spin bosons on the manifestation of collective behaviour in nuclei is examined by plotting
theB(E2; 2+→0+) rates as a function of neutron number for various values ofη, whereη is the highest angular momentum of the bosons included in the calculation.B(E2; 2+→0+) values of a large number of nuclei in various regions of the nuclear periodic table are calculated with a single value for
the effective charge in the generalized scheme. Irreducible representations of SU(3) contained in the symmetric partition
[N] of U(15) are worked out for integersN uptoN=15, to enable the explicit inclusion of theg boson into calculations. The experimentally observed odd-K bands in234U and184W are described as a direct consequence of theg boson. 相似文献