共查询到20条相似文献,搜索用时 31 毫秒
1.
A. I. Sukachev 《Moscow University Physics Bulletin》2009,64(4):374-378
Mixing of neutral K
0 mesons is studied in the framework of the minimal supersymmetric model (MSSM) with a Yukawa type II sector and explicit violation
of CP invariance in the Higgs potential. Mixing parameters Δm
LS
and ɛ are calculated in the limit of the four-fermion approximation with charged Higgs boson exchange. This work specifies
the data presented in [1] more precisely and, taking into account the influence of new contributions on the above observables,
proves the small degree of supersymmetric effects for a system of K
0 mesons. 相似文献
2.
3.
We investigate the possibility of existence of a symmetric potential HABA′B′=H(AB)(A′B′) for a symmetric (3,1)-spinor LABCA′, e.g., a Lanczos potential of the Weyl spinor, as defined by the equation LABCA′=(AB′HBC)A′B′. We prove that in all Einstein space–times such a symmetric potential HABA′B′ exists. Potentials of this type have been found earlier in investigations of some very special spinors in restricted classes of space–times. A tensor version of this result is also given. We apply similar ideas and results by Illge to Maxwell’s equations in a curved space–time. 相似文献
4.
P. Igo-Kemenes 《Pramana》2004,62(3):555-560
During the twelve years of operation of thee
+
e
− collider LEP, the associated collaborations, ALEPH, DELPHI, L3 and OPAL, have extensively searched for Higgs bosons over
a broad range of masses. We present the final results from LEP for the standard model Higgs boson which are obtained from
a statistical combination of the data from the four experiments. We also present preliminary combined results for neutral
Higgs bosons in the minimal supersymmetric model (MSSM) where the Higgs sector is assumed to be CP invariant. Finally, we
discuss an alternative MSSM scenario including CP violation in the Higgs sector. 相似文献
5.
The infrared (IR) spectrum of PD3 has been recorded in the 1580–1800 cm−1 range at a resolution of 0.0027 cm−1. About 2400 rovibrational transitions with J′=K′22 have been measured and assigned to the ν1 (A1) and ν3 (E) stretching fundamentals. These include 506 “perturbation-allowed” transitions with selection rules Δ(k−l)=±3. Splittings of the K′′=3 lines have been observed. Effects of strong perturbations are evident in the spectrum. Therefore the rovibrational Hamiltonian adopted for the analysis explicitly takes into account the Coriolis and k-type interactions between the v1=1 and v3=1 states, and includes also several essential resonances within these states. The rotational structure in the v1=1 and v3=1 vibrational states up to J′=K′=18 was reproduced by fitting simultaneously all experimental data. Thirty-four parameters reproduced 1950 transitions retained in the final cycle with a standard deviation of the fit equal to 4.9 × 10−4 cm−1 (about the precision of the experimental measurements). 相似文献
6.
Generalizing a previous model to accommodate the third quark family and CP violation, we present a T′ model which predicts tribimaximal neutrino (PMNS) mixings while the central predictions for quark mixings are |Vtd/Vts|=0.245 and |Vub/Vcb|=0.237 with a predicted CP violating KM phase δKM=65.8°. All these are acceptably close to experiment, including the KM phase for which the allowed values are 63°<δKM<72°, and depend only on use of symmetry T′×Z2 to define the model and no additional parameters. 相似文献
7.
The 333.6-, 351.1-, and 363.8-nm lines of a cw argon ion laser are found to coincide with the BaS B1Σ+-X1Σ+ (12, 0) R(17), (6, 0) P(35), and (3, 0) R(125) transitions, respectively. Fluorescence transitions from the laser-prepared upper levels terminating in X1Σ+ V = 0–28, A1Σ+ V = 1–3, A′1Π V = 1–13, and a3Π1 V = 3–12 are assigned. These results are combined with a previous analysis of the extensively perturbed BaS A1Σ+-X1Σ+ system [R. F. Barrow, W. G. Burton, and P. A. Jones, Trans. Farad. Soc.67, 902–906 (1971)]. Every observed perturbation of the BaS A1Σ+ state is electronically and vibrationally assigned. The levels a3Π0 V = 10–13, a3Π1 V = 12–14, a3Π2 V = 15, and A′1Π V = 10–13 are sampled via their perturbations of A1Σ+ V = 0–2. Although the mutual interactions of the a3Π, A′1Π, and A1Σ+ states approach Hund's case (c) limit, a complete deperturbation is performed from a case (a) starting point. Of the five lowest energy electronic states of BaS, only b3Σ+ remains uncharacterized. Principal deperturbed molecular constants are (in cm−1, 1σ uncertainties in parentheses):
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8.
We compute the inclusive differential cross section production of the pseudo-scalar meson η′ in high-energy proton-nucleus (pA) collisions. We use an effective coupling between gluons and η′ meson to derive a reduction formula that relates the η′ production to a field-strength tensor correlator. We take into account saturation effects on the nucleus side by using the Color Glass Condensate formalism to evaluate this correlator. We derive new results for Wilson line - color charges correlators in the McLerran-Venugopalan model needed in the computation of η′ production. The unintegrated parton distribution functions are used to characterize the gluon distribution inside the proton. We show that the cross section is sensitive to saturation effects so it can be utilized to estimate the value of the saturation scale. 相似文献
9.
R. J. Lovell S. J. Daunt M. Dakhil G. W. Halsey W. E. Blass 《Journal of Molecular Spectroscopy》1985,110(2)
The 2ν3(A1) band of 12CD3F near 5.06 μm has been recorded with a resolution of 20–24 × 10−3 cm−1. The value of the parameter (αB − αA) for this band was found to be very small and, therefore, the K structure of the R(J) and P(J) manifolds was unresolved for J < 15 and only partially resolved for larger J values. The band was analyzed using standard techniques and values for the following constants determined: ν0 = 1977.178(3) cm−1, B″ = 0.68216(9) cm−1, D″J = 1.10(30) × 10−6 cm−1, αB = (B″ − B′) = 3.086(7) × 10−3 cm−1, and βJ = (D″J − D′J) = −3.24(11) × 10−7 cm−1. A value of αA = (A″ − A′) = 2.90(5) × 10−3 cm−1 has been obtained through band contour simulations of the R(J) and P(J) multiplets. 相似文献
10.
Na2 excited from the X1Σg+ state to the A1Σu+ state by a narrow band (3 MHz) Rhodamine-6G dye laser at 6022.3 Å, the same wavelength at which Na undergoes the 3s–5s two-photon transition, gives four fluorescence series from A1Σu+ levels (v′ = 21, J′ = 26), (18, 33), (33, 19), and (34, 50). The last two series are much weaker in intensity, and at long wavelengths many doublets are lost in the background noise. The same (34, 50) fluorescence series was found by other workers in the lab using a Kr+ (5682 Å) laser as excitation source. Their analysis agrees very well with the findings in the work. 相似文献
11.
A. Bartl H. Fraas S. Hesselbach K. Hohenwarter-Sodek T. Kernreiter G. Moortgat-Pick 《The European Physical Journal C - Particles and Fields》2007,51(1):149-161
We study CP violation in chargino production and decay in the minimal supersymmetric standard model (MSSM) with complex parameters
at an e+e- linear collider with longitudinally polarised beams. We investigate CP-sensitive asymmetries by means of triple product correlations
and study their dependence on the complex parameters M1 and μ. We give numerical predictions for the asymmetries and their measurability at the future International Linear Collider.
Our results show that the CP asymmetries can be measured in a large region of the MSSM parameter space. 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.
E. Shabalin 《Physics Reports》1999,320(1-6)
The additional source of CP violation appearing in the electroweak theory with three Higgs doublets could contribute considerably to the ratio ′/. 相似文献
14.
S. Khalil 《The European Physical Journal C - Particles and Fields》2007,50(1):35-46
We analyze supersymmetric contributions to the branching ratios and CP asymmetries of B-→D0K- and B-→D̄0K- processes. We investigate the possibility that supersymmetric CP violating phases can affect our determination for the angle
γ in the unitary triangle of Cabibbo–Kobayashi–Maskawa mixing matrix. We calculate the gluino and chargino contributions to
b→u(c̄s) and b→c(ūs) transitions in a model independent way by using the mass insertion approximation method. We also revise
the D0–D̄0 mixing constraints on the mass insertions between the first and second generations of the up sector. We emphasize that in
case of negligible D0–D̄0 mixing, one should consider simultaneous contributions from more than one mass insertion in order to be able to obtain the
CP asymmetries of these processes within their 1σ experimental range. However, with a large D0–D̄0 mixing, one finds a significant deviation between the two asymmetries and it becomes natural to have them of the order of
the central values of their experimental measurements. 相似文献
15.
Yang Zhang Chong-Yang Chen Yan-Sen Wang Ya-Ming Zou 《Journal of Quantitative Spectroscopy & Radiative Transfer》2009,110(18):2180-2190
A detailed and large-scale calculation on the resonant excitation rate coefficients from the ground state to the 106 fine-structure levels belonging to 3l174l′(l=0,1,2;l′=0,1,2,3) configurations of Ni-like gold have been performed using the relativistic distorted-wave approximation. The contributions through all possible Cu-like doubly excited states 3l174l′n″l″and 3l175l′n″l″(n″≤15,l″≤8) are calculated explicitly. The radiative damping effects on resonant excitation rates are studied. Significant effects arising from decays to autoionizing levels are also investigated. The n−3scaling law is investigated and is used to obtain the contributions from high-n configurations. Contributions from resonant excitation are found to be as important as direct excitation processes for most transitions. In some cases, resonant excitation can enhance the excitation rate coefficients by an order of magnitude. In addition, the total dielectronic recombination rate coefficients of Ni-like gold are also presented and compared with other works. 相似文献
16.
The first-order eikonal approximation is frequently adopted in interpreting the results of A(e,e′p) measurements. Glauber calculations, for example, typically adopt the first-order eikonal approximation. We present an extension of the relativistic eikonal approach to A(e,e′p) which accounts for second-order eikonal corrections. The numerical calculations are performed within the relativistic optical model eikonal approximation. The nuclear transparency results indicate that the effect of the second-order eikonal corrections is rather modest, even at Q2≈0.2 (GeV/c)2. The same applies to polarization observables, left–right asymmetries, and differential cross sections at low missing momenta. At high missing momenta, however, the second-order eikonal corrections are significant and bring the calculations in closer agreement with the data and/or the exact results from models adopting partial-wave expansions. 相似文献
17.
We identify the four observed intermediate states between J/ψ and ψ′ with the four jPC = j++P waves of a relativistic bound state model. Assuming a point-like quark photon vertex we calculate bounds on their radiative couplings to J/ψ and ψ′ by the help of four-dimensional dipole sum rules. These bounds also imply upper bounds on the total widths. 相似文献
18.
Xiao-Gang He 《Physics letters. [Part B]》1999,460(3-4)
Recently the KTev Collaboration has measured Re (ε′/ε)=(28±4.1)×10−4 which is in agreement with early measurements from NA31. The Standard Model prediction for ε′/ε is on the lower end of the experimentally allowed range depending on models for hadronic matrix elements. In this paper we study the contributions from anomalous gauge couplings. We find that the contributions from anomalous couplings can be significant and can enhance ε′/ε to have a value closer to data. 相似文献
19.
Florence Cordier Marco Rogowski Stephan Grzesiek Ad Bax 《Journal of magnetic resonance (San Diego, Calif. : 1997)》1999,140(2):510
It is demonstrated that J connectivity between amide protons and hydrogen-bond-accepting carbonyl carbons can be observed in perdeuterated human ubiquitin. A selective pulse scheme is used to detect these small 2hJHC′ interactions in the presence of the much larger through-covalent-bond 2JHC′ and 3JHC′ couplings. The ratio of the observed through-H-bond correlation intensity and the 2JHC′ connectivity observed in a reference spectrum indicates 2hJHC′ values of ca. 0.4–0.6 Hz, which are only slightly smaller than the corresponding 3hJNC′ values. However, for technical reasons, 2hJHC′ couplings are more difficult to measure than 3hJNC′. 相似文献
20.
The emission spectrum of SbCl has been photographed at high resolution in the region 400 to 640 nm. In addition to bands of two previously reported transitions in this region, A1-X and A2-X, 36 bands of a new system have been identified. A vibrational analysis has been made with ν00 ≈ 20 679 cm−1, and 7 of the bands have been rotationally analyzed. The electronic transition has ΔΩ = 0 with lower state constants which match published data for the ground state X3Σ−(0+). The upper state is characterized by the following 121Sb35Cl molecular parameters: B′0 = 0.0922 cm−1, D′0 = 3.1 × 10−8 cm−1. 相似文献