scholarly journals CP asymmetry from hadronic charm rescattering in B± → π−π+π± decays at the high mass region

2020 ◽  
Vol 806 ◽  
pp. 135490 ◽  
Author(s):  
I. Bediaga ◽  
T. Frederico ◽  
P.C. Magalhães
Keyword(s):  
Mass Region ◽  
High Mass ◽  
Cp Asymmetry ◽  
High Mass Region

scholarly journals Large scalar multiplet dark matter in the high-mass region

2017 ◽  
Vol 96 (1) ◽  
Author(s):  
Heather E. Logan ◽  
Terry Pilkington
Keyword(s):  
Dark Matter ◽  
Mass Region ◽  
High Mass ◽  
High Mass Region

scholarly journals SEARCHING FOR THE QUARK–DIQUARK SYSTEMATICS OF BARYONS COMPOSED BY LIGHT QUARKS q = u, d

2010 ◽  
Vol 25 (15) ◽  
pp. 2965-2995 ◽  
Author(s):  
A. V. ANISOVICH ◽  
V. V. ANISOVICH ◽  
M. A. MATVEEV ◽  
V. A. NIKONOV ◽  
A. V. SARANTSEV ◽  
...  
Keyword(s):  
Axial Vector ◽  
Mass Region ◽  
High Mass ◽  
Vector State ◽  
Double Pole ◽  
High Mass Region ◽  
Pole Structure ◽  
State Formula ◽  
Baryon Resonances

Supposing quark–diquark structure of baryons, we look for systematics of baryons composed of light quarks (q = u, d). We systematize baryons using the notion of two diquarks: (i) axial–vector state, [Formula: see text], with the spin SD = 1 and isospin ID = 1 and (ii) scalar one, [Formula: see text], with the spin SD = 0 and isospin ID = 0. We consider several schemes for the composed baryons: (1) with different diquark masses, [Formula: see text], (2) with [Formula: see text] and overlapping [Formula: see text] and [Formula: see text] states (resonances), (3) with/without SU(6) constraints for low-lying states (with quark–diquark orbital momenta L = 0). In the high-mass region, the model predicts several baryon resonances at M ~ 2.0–2.9 GeV . Moreover, the model gives us the double pole structure (i.e. two poles with the same Re M but different Im M) in many amplitudes at masses M ≳ 2.0 GeV . We see also that for description of low-lying baryons (with L = 0), the SU(6) constraint is needed.

scholarly journals Studies of the resonance components in the $$B_s$$ decays into charmonia plus kaon pair

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
Zhou Rui ◽  
Ya Li ◽  
Hong Li
Keyword(s):  
Mass Spectra ◽  
Branching Ratios ◽  
Mass Region ◽  
Lhcb Collaboration ◽  
High Mass ◽  
Mass Window ◽  
Resonant Structures ◽  
Three Body ◽  
Near Future ◽  
Existing Data

Abstract In this work, the decays of $$B_s$$Bs meson to a charmonium state and a $$K^+K^-$$K+K- pair are carefully investigated in the perturbative QCD approach. Following the latest fit from the LHCb experiment, we restrict ourselves to the case where the produced $$K^+K^-$$K+K- pair interact in isospin zero S, P, and D wave resonances in the kinematically allowed mass window. Besides the dominant contributions of the $$\phi (1020)$$ϕ(1020) resonance in the P-wave and $$f_2'(1525)$$f2′(1525) in the D-wave, other resonant structures in the high mass region as well as the S-wave components are also included. The invariant mass spectra for most of the resonances in the $$B_s\rightarrow J/\psi K^+K^-$$Bs→J/ψK+K- decay are well reproduced. The obtained three-body decay branching ratios can reach the order of $$10^{-4}$$10-4, which seem to be accessible in the near future experiments. The associated polarization fractions of those vector-vector and vector-tensor modes are also predicted, which are compared with the existing data from the LHCb Collaboration.

CLUSTER PHYSICS WITH DARK ENERGY

2011 ◽  
Vol 20 (08) ◽  
pp. 1327-1337
Author(s):  
SEOKCHEON LEE
Keyword(s):  
Dark Energy ◽  
Critical Density ◽  
Mass Region ◽  
High Mass ◽  
Cluster Number ◽  
The Press ◽  
Energy Dependent ◽  
The Universe ◽  
Matter Energy ◽  
Mass Fluctuation

Dark energy affects the abundance and evolution of clusters owing to their dependence on the geometry of the Universe and the power spectrum. Usually, there exits the degeneracy between σ8 and the matter energy density contrast [Formula: see text]. We avoid this by using the explicit dark energy dependent rms linear mass fluctuation σ8 which is consistent with the CMB normalization for general constant dark energy equation of state, ω Q . When we use the correct value of the critical density threshold δc = 1.58 into the cluster number density n calculation in the Press–Schechter (PS) formalism, PS formalism predicts the cluster number consistent with both simulation and observed data at the high mass region. The improved coefficients of Sheth–Tormen (ST) formalism by using the correct δc is also obtained. We found that changing ω Q by Δω Q = -0.1 from ω Q = -1.0 causes the changing of the comoving numbers of high mass clusters of M = 1016h-1M⊙ by about 20 and 40% at z = 0 and 1, respectively.

Effect of Stereoregularity on TOF-SIMS Spectra of Polymers

1994 ◽  
Vol 48 (5) ◽  
pp. 620-622 ◽  
Author(s):  
Paul A. Zimmerman ◽  
David M. Hercules
Keyword(s):  
Mass Spectrometry ◽  
Methyl Methacrylate ◽  
Secondary Ion Mass Spectrometry ◽  
Time Of Flight ◽  
Mass Region ◽  
High Mass ◽  
Polypropylene Oxide ◽  
Tof Sims ◽  
Stereoregular Polymers ◽  
Secondary Ion

This study shows the utility of time-of-flight secondary ion mass spectrometry (TOF-SIMS) for the analysis of stereoregular polymers. It is possible to obtain distinctive spectra for polymers of different stereoregularity. The high mass region of the spectrum from 600 to 3000 Da is related to differences in polymer stereoregularity. Differences occur in the relative intensities and/or locations of clusters for polymers of different stereoregularities. Polymers studied include poly(methyl methacrylate), polypropylene, and polypropylene oxide. The extent of stereoregularity influences the degree of difference observed in the TOF-SIMS spectra.

J/ψ DECAYS AND η-η′-ι MIXING

1994 ◽  
Vol 09 (31) ◽  
pp. 5489-5506 ◽  
Author(s):  
ICHIJIRO KITAMURA ◽  
NORIKAZU MORISITA ◽  
TADAYUKI TESHIMA
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Mass Region ◽  
High Mass ◽  
Radial Excitation ◽  
Recent Experimental Data ◽  
Chiral Perturbation ◽  
Pseudoscalar Mesons ◽  
Low Mass ◽  
Excitation State

The mass region near η(1440) has more than one resonance, and two resonances with M≈1420 MeV and M≈1490 MeV are shown to give a better description of the recent experimental data. We investigate whether η(1420) or η(1490) is the glueball, if it exists, and which of them is the isospin 0 partner of the radially excited state η(1295) expected to exist near the 1500–1600 MeV region. We study the J/ψ→VP and Pγ decays, using the new data of 1992, to estimate the mixing among (η, η′, ι), where ι refers to the glueball, and obtain the result that the N component in ι is larger than the S component. Comparing the N and S components in ι with the N and S components in η(1420) and η(1490) obtained from their decaying pattern, we conjecture that the low mass state η(1420) is the glueball and the high mass state η(1490) is the radial excitation state. We discuss the relation between the mass formulae for the pseudoscalar mesons and the mixing among (η, η′, ι) obtained considering the chiral perturbation theory and the chiral U(3) × U(3) symmetry formulation.

scholarly journals Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
A. Abed Abud ◽  
...  
Keyword(s):  
Contact Interaction ◽  
Hadron Collider ◽  
Mass Range ◽  
New Physics ◽  
Mass Region ◽  
Mass Scale ◽  
Energy Scale ◽  
High Mass ◽  
Final States ◽  
Dilepton Final States

Abstract A search for new physics with non-resonant signals in dielectron and dimuon final states in the mass range above 2 TeV is presented. This is the first search for non-resonant signals in dilepton final states at the LHC to use a background estimate from the data. The data, corresponding to an integrated luminosity of 139 fb−1, were recorded by the ATLAS experiment in proton-proton collisions at a center-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV during Run 2 of the Large Hadron Collider. The benchmark signal signature is a two-quark and two-lepton contact interaction, which would enhance the dilepton event rate at the TeV mass scale. To model the contribution from background processes a functional form is fit to the dilepton invariant-mass spectra in data in a mass region below the region of interest. It is then extrapolated to a high-mass signal region to obtain the expected background there. No significant deviation from the expected background is observed in the data. Upper limits at 95% CL on the number of events and the visible cross-section times branching fraction for processes involving new physics are provided. Observed (expected) 95% CL lower limits on the contact interaction energy scale reach 35.8 (37.6) TeV.

scholarly journals Bounds on dark matter annihilation cross-sections from inert doublet model in the context of 21-cm cosmology of dark ages

2021 ◽  
pp. 2150163
Author(s):  
Rupa Basu ◽  
Madhurima Pandey ◽  
Debasish Majumdar ◽  
Shibaji Banerjee
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Mass Range ◽  
Mass Region ◽  
High Mass ◽  
Dark Matter Annihilation ◽  
Dark Ages ◽  
Doublet Model ◽  
Inert Doublet Model ◽  
Text Signal

We study the fluctuations in the brightness temperature of 21-cm signal [Formula: see text] at the dark ages ([Formula: see text]) with a dark matter (DM) candidate in Inert Doublet Model (IDM). We then explore the effects of different fractions of IDM DM on [Formula: see text] signal. The IDM DM masses are chosen in few tens of GeV region as well as in the high mass region beyond 500 GeV. It has been observed that the [Formula: see text] signal is more sensitive in the DM mass range of 70–80 GeV. A lower bound on annihilation cross-section for this DM is also obtained by analyzing the [Formula: see text] signal. This is found to lie within the range [Formula: see text] cm3/s for the IDM DM mass range 10 GeV[Formula: see text] GeV.

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