scholarly journals The $\pi^0$ mass and the first experimental verification of Coulomb de-excitation in pionic hydrogen

2021 ◽  
Author(s):  
Manfred Daum ◽  
Peter-R. Kettle
Keyword(s):  
Charged Pion ◽  
Pion Mass ◽  
Mass Difference ◽  
Large Contribution ◽  
Charge Exchange Reaction ◽  
Pionic Hydrogen ◽  
A Value ◽  
Pionic Atom ◽  
First Time ◽  
Cpt Theorem

The most precise value for the \pi^0π0 mass was obtained from the measurement of the mass difference m_{\pi^-}-m_{\pi^0} = 4.593\,64(48)mπ−−mπ0=4.59364(48),MeV/c^22 in the charge exchange reaction \pi^-π−p \rightarrow \pi^0→π0n at PSI. With the most precise charged pion mass value, m_{\pi^+} = 139.570\,21(14)mπ+=139.57021(14),MeV/c^22 and the validity of the CPT theorem (m_{\pi^-} = m_{\pi^+}mπ−=mπ+), a value m_{\pi^0} = 134.976\,57(50)mπ0=134.97657(50),MeV/c^22 is obtained. The measurements also revealed, for the first time, evidence of an unexpectedly large contribution from Coulomb de-excitation states during the pionic atom cascade.

scholarly journals Mass determination of the charged pion, using high precision X-ray spectroscopy

2020 ◽  
Vol 9 ◽  
pp. 308
Author(s):  
D. F. Anagnostopoulos, et al.
Keyword(s):  
Electronic Transition ◽  
Transition Energy ◽  
Charged Pion ◽  
Pion Mass ◽  
Mass Determination ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Line Shapes ◽  
A Value

X-ray transitions in pionic nitrogen were measured using a curved crystal spectrometer. From the transition energy, calibrated with the help of the copper Ka1,2 electronic transition, a value for the charged pion mass of (139.57071± 0.00053) MeV/c2 was deduced. In order to reduce the uncertainty of the charged pion mass in the level of 1 ppm, we propose the determination of pionic transition energy based on the more precisely known energies and line shapes of muonic transitions.

scholarly journals Another SMEFT story: Z′ facing new results on ε′/ε, ∆MK and K → $$ \pi \nu \overline{\nu} $$

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Jason Aebischer ◽  
Andrzej J. Buras ◽  
Jacky Kumar
Keyword(s):  
Renormalization Group ◽  
Mass Difference ◽  
Branching Ratios ◽  
New Physics ◽  
Matrix Elements ◽  
Isospin Breaking ◽  
Left Handed ◽  
The Standard Model ◽  
First Time ◽  
Group Effects

Abstract Recently the RBC-UKQCD lattice QCD collaboration presented new results for the hadronic matrix elements relevant for the ratio ε′/ε in the Standard Model (SM) albeit with significant uncertainties. With the present knowledge of the Wilson coefficients and isospin breaking effects there is still a sizable room left for new physics (NP) contributions to ε′/ε which could both enhance or suppress this ratio to agree with the data. The new SM value for the K0 − $$ {\overline{K}}^0 $$ K ¯ 0 mass difference ∆MK from RBC-UKQCD is on the other hand by 2σ above the data hinting for NP required to suppress ∆MK. Simultaneously the most recent results for K+ → $$ {\pi}^{+}\nu \overline{\nu} $$ π + ν ν ¯ from NA62 and for KL → $$ {\pi}^0\nu \overline{\nu} $$ π 0 ν ν ¯ from KOTO still allow for significant NP contributions. We point out that the suppression of ∆MK by NP requires the presence of new CP-violating phases with interesting implications for K → $$ \pi \nu \overline{\nu} $$ πν ν ¯ , KS → μ+μ− and KL → π0ℓ+ℓ− decays. Considering a Z′-scenario within the SMEFT we analyze the dependence of all these observables on the size of NP still allowed by the data on ε′/ε. The hinted ∆MK anomaly together with the εK constraint implies in the presence of only left-handed (LH) or right-handed (RH) flavour-violating Z′ couplings strict correlation between K+ → $$ {\pi}^{+}\nu \overline{\nu} $$ π + ν ν ¯ and KL → $$ {\pi}^0\nu \overline{\nu} $$ π 0 ν ν ¯ branching ratios so that they are either simultaneously enhanced or suppressed relative to SM predictions. An anticorrelation can only be obtained in the presence of both LH and RH couplings. Interestingly, the NP QCD penguin scenario for ε′/ε is excluded by SMEFT renormalization group effects in εK so that NP effects in ε′/ε are governed by electroweak penguins. We also investigate for the first time whether the presence of a heavy Z′ with flavour violating couplings could generate through top Yukawa renormalization group effects FCNCs mediated by the SM Z-boson. The outcome turns out to be very interesting.

Postmoney theory: value function in the domain of postmoney

foresight ◽  
2018 ◽  
Vol 20 (5) ◽  
pp. 554-570
Author(s):  
Boyan Christov Ivantchev
Keyword(s):  
Social Impact ◽  
Value Function ◽  
Human Life ◽  
Intrinsic Value ◽  
Panel Study ◽  
Economic Research ◽  
Strong Base ◽  
Content Type ◽  
A Value ◽  
First Time

Purpose The purpose of this study is to research the latest quantitative and qualitative transformations of money and its interaction with the market economy and societies in terms of their influence on the inner nature of money and its transformation from a simple tool to an aim per se, i.e. postmoney. Transforming the perception of the intrinsic value and “soul” of the money into the postmoney, influenced by the rising longevity and wide expectation for the ability to scientifically prolong the human life, will be discussed. This transformation will be confirmed by analysing the results from a national representative sociological survey (panel study with sample size n = 1,000). Design/methodology/approach The author uses the following philosophical methodological approaches – comparative-constructive, phenomenological, cognitive and deconstructive analysis. Findings The objective and qualitative reasons offered by the postmoney theory (PMT) for the transformation of money into postmoney, are related to the being of temporality, as well as to technologization and the sixth factor of production, scientific exponentiality and mental changes in the human being. A current postmoney survey gives a strong base to believe that the perception of an intrinsic value of postmoney changes the shape of a value function – from logarithmic to linear or even stochastic. This is the reason to believe that increasing of a postmoney quantity will lead to a qualitative transformation and psychological increase of postmoney sensitivity. Research limitations/implications The author intends to expand the postmoney survey on the international level so to confirm local findings. Practical implications Postmoney survey might be used as a powerful tool in creating and legalizing non-monistic money based on blockchain technologies and philosophical and socio-economic research of the postmoney issue. Social implications The future of money is of great importance for the exponentiality of the socio-economic environment and societies. Social impact of the money will be inevitably rising in the domain of postmoney perception. Originality/value The author of the current paper coined for the first-time notion of postmoney and now is expanding research developing PMT. As per the best knowledge of the author, shape of the curve of value function was not questioned and believes it might be of help to better understand the money phenomenon.

Infra-red chemiluminescence II. Spectroscopic data

1960 ◽  
Vol 258 (1295) ◽  
pp. 564-575 ◽  
Keyword(s):  
Transition Probabilities ◽  
Molecular Spectroscopy ◽  
Radiative Transition ◽  
Absorption Data ◽  
A Value ◽  
Interaction Factor ◽  
Infra Red ◽  
Rotational Distribution ◽  
Vibration Rotation ◽  
First Time

The technique described in part I has been used to obtain constants of interest in molecular spectroscopy. The vibration-rotation interaction factor, F for HCl has been evaluated from the infra-red emission spectrum. The critical parameter in F is θ = M 0 / M 1 r e , where M 0 and M 1 are the first two coefficients in the electric dipole moment expansion about the equilibrium internuclear distance r e . A value of θ = + 1.12 ± 0.18 has been obtained. It is shown that for molecules with θ = +1 the total band intensity in emission is independent of the rotational distribution in the vibrational state from which the emission occurs. This has been made use of in evaluating radiative transition probabilities. For the HCl v (3-1) transition a value for | R 3 1 | 2 (= 1.60 x 10 -4 debye 2 ) was obtained for the first time. The same method yields a value of | R 2 1 | 2 / | R 2 0 | 2 = 204, in good agreement with an earlier estimate from absorption data.

scholarly journals Constitution and Modernization of Legislation: Proceedings of the XV International School of Young Legal Scholars (Moscow, May 27 – June 5, 2020)

2020 ◽  
Author(s):  
A.Ya. Kapustin ◽  
I.I. Kucherov ◽  
S.A. Sinitsyn ◽  
A.I. Kovler ◽  
Yu.N. Kashevarova
Keyword(s):  
Russian Federation ◽  
Comparative Law ◽  
International School ◽  
International Union ◽  
A Value ◽  
The Russian Federation ◽  
The Government ◽  
Legal Understanding ◽  
First Time ◽  
Epidemiological Situation

Modern constitutional transformations, asserting a “value” legal understanding, actualize theoretical and practical problems of legislative regulation, serve as a prereq- uisite for rethinking the essence, role and significance of law in the life of society, and determine the formulation of a number of issues related, first of all, to the qualitative implementation of novelties. This collection reflects the diversity and depth of scientific discussions of the XV In- ternational school of young legal scholars on the topic “Constitution and modernization of legislation”, which was held by the Institute of legislation and comparative law under the Government of the Russian Federation in cooperation with the International Union of lawyers. In the context of a difficult epidemiological situation related to the spread of corona- virus infection, in order to protect the health of conference participants, the organizing Committee decided to hold the XV School remotely (by correspondence). For the first time, all its scientific events were held online. The participants had a unique opportunity to communicate with the direct developers of amendments to the Constitution of the Russian Federation, present their reports in a new format.

scholarly journals Measurement report: Biogenic VOC emissions profiles of Rapeseed leaf litter and their SOA formation potential

2021 ◽  
Author(s):  
Letizia Abis ◽  
Carmen Kalalian ◽  
Bastien Lunardelli ◽  
Tao Wang ◽  
Liwu Zhang ◽  
...  
Keyword(s):  
Uv Light ◽  
Organic Aerosols ◽  
Light Irradiation ◽  
Large Contribution ◽  
Biogenic Volatile Organic Compounds ◽  
Voc Emissions ◽  
Uv Light Irradiation ◽  
Biogenic Voc ◽  
Volatile Organic ◽  
First Time

Abstract. We analysed the biogenic volatile organic compounds (BVOC) emissions from rapeseed leaves litter and their potential to create secondary organic aerosols (SOA) under three different conditions i.e., (i) in presence of UV light irradiation; (ii) in presence of ozone, and (iii) with both ozone and UV light. These experiments have been performed in a controlled atmospheric simulation chamber containing leaves litter samples, where BVOC and aerosol number concentrations have been measured for 6 days. Our results show that BVOC emission profiles were affected by UV light irradiation, which increased the summed BVOC emissions compared to the experiment with solely O3. Furthermore, the diversity of emitted VOCs from the rapeseed litter increased also in presence of UV light irradiation. SOA formation was observed when leaves litter were exposed to both UV light and O3, indicating a potentially large contribution to particle formation or growth at local scales. To our knowledge, this study investigates for the first time the effect of UV irradiation and O3 exposure on both VOC emissions and SOA formation for leaves litter samples. A detailed discussion about the processes behind the biological production of the most important VOC is proposed.

Direct visualization of a vast cortical calcium compartment in Paramecium by secondary ion mass spectrometry (SIMS) microscopy: possible involvement in exocytosis

1995 ◽  
Vol 108 (5) ◽  
pp. 1895-1909 ◽  
Author(s):  
N. Stelly ◽  
S. Halpern ◽  
G. Nicolas ◽  
P. Fragu ◽  
A. Adoutte
Keyword(s):  
Mass Spectrometry ◽  
Secondary Ion Mass Spectrometry ◽  
Membrane Vesicles ◽  
Cell Periphery ◽  
A Value ◽  
External Reference ◽  
Ion Mass Spectrometry ◽  
First Time ◽  
Secondary Ion

The plasma membrane of ciliates is underlaid by a vast continuous array of membrane vesicles known as cortical alveoli. Previous work had shown that a purified fraction of these vesicles actively pumps calcium, suggesting that alveoli may constitute a calcium-storage compartment. Here we provide direct confirmation of this hypothesis using in situ visualization of total cell calcium on sections of cryofixed and cryosubstituted cells analyzed by SIMS (secondary ion mass spectrometry) microscopy a method never previously applied to protists. A narrow, continuous, Ca-emitting zone located all along the cell periphery was observed on sections including the cortex. In contrast, Na and K were evenly distributed throughout the cell. Various controls confirmed that emission was from the alveoli, in particular, the emitting zone was still seen in mutants totally lacking trichocysts, the large exocytotic organelles docked at the cell surface, indicating that they make no major direct contribution to the emission. Calcium concentration within alveoli was quantified for the first time in SIMS microscopy using an external reference and was found to be in the range of 3 to 5 mM, a value similar to that for sarcoplasmic reticulum. After massive induction of trichocyst discharge, this concentration was found to decrease by about 50%, suggesting that the alveoli are the main source of the calcium involved in exocytosis.

scholarly journals Monopole and instanton effects in QCD

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Masayasu Hasegawa
Keyword(s):  
Dirac Operator ◽  
Matrix Theory ◽  
Charged Pion ◽  
Lattice Gauge Theory ◽  
Pion Mass ◽  
Magnetic Monopoles ◽  
Chiral Condensate ◽  
Creation Operator ◽  
Experimental Result ◽  
Qcd Vacuum

Abstract We aim to show the effects of the magnetic monopoles and instantons in quantum chromodynamics (QCD) on observables; therefore, we introduce a monopole and anti-monopole pair in the QCD vacuum of a quenched SU(3) by applying the monopole creation operator to the vacuum. We calculate the eigenvalues and eigenvectors of the overlap Dirac operator that preserves the exact chiral symmetry in lattice gauge theory using these QCD vacua. We then investigate the effects of magnetic monopoles and instantons. First, we confirm the monopole effects as follows: (i) the monopole creation operator makes the monopoles and anti-monopoles in the QCD vacuum. (ii) A monopole and anti-monopole pair creates an instanton or anti-instanton without changing the structure of the QCD vacuum. (iii) The monopole and anti-monopole pairs change only the scale of the spectrum distribution without affecting the spectra of the Dirac operator by comparing the spectra with random matrix theory. Next, we find the instanton effects by increasing the number density of the instantons and anti-instantons as follows: (iv) the decay constants of the pseudoscalar increase. (v) The values of the chiral condensate, which are defined as negative numbers, decrease. (vi) The light quarks and the pseudoscalar mesons become heavy. The catalytic effect on the charged pion is estimated using the numerical results of the pion decay constant and the pion mass. (vii) The decay width of the charged pion becomes wider than the experimental result, and the lifetime of the charged pion becomes shorter than the experimental result. These are the effects of the monopoles and instantons in QCD.

Pion Mass Difference in Bars-Halpern-Yoshimura Unified Gauge Model

1976 ◽  
Vol 31 (11) ◽  
pp. 1429-1430
Author(s):  
Satya N. Sinha
Keyword(s):  
Pion Mass ◽  
Mass Difference ◽  
Unified Model ◽  
Gauge Model ◽  
Perturbative Calculation ◽  
Soft Pion

Abstract Pion mass difference has been calculated in the renormalizable gauge model of Bars-Halpern-Yoshimura. It is found that the soft pion mass difference is finite in the lowest order perturbative calculation, similar to the result obtained in the unified model of Salam-Weinberg. The mass difference of Kaon has also been discussed.

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