scholarly journals Meson decay studies from MAMI A2

2019 ◽  
Vol 212 ◽  
pp. 03004
Author(s):  
Lena Heijkenskjöld
Keyword(s):  
Light Quark ◽  
Precision Measurements ◽  
High Yield ◽  
Beyond The Standard Model ◽  
Mass Ratio ◽  
Hadron Physics ◽  
The Standard Model ◽  
Light Quark Mass ◽  
Light Mesons ◽  
Scattering Lengths

Decays of the light mesons π0, η, ω, and η’ provide a unique laboratory to test fundamental aspects of hadron physics. Precision studies of such diverse topics as the light quark mass ratio, π−π scattering lengths, and searches for physics beyond the Standard Model are possible. Additionally, Dalitz decays of light mesons provide a way of measuring the electromagnetic meson transition formfactors in the time-like region. The A2 tagged photon facility at the Mainz Microtron provides a high yield of light mesons produced by photo-induced reactions on protons, which makes the experiment ideal for high precision measurements of meson decays. Presented here are the contributions made by the A2 collaboration to such studies.

scholarly journals An optical tweezer array of ultracold molecules

Science ◽  
2019 ◽  
Vol 365 (6458) ◽  
pp. 1156-1158 ◽  
Author(s):  
Loïc Anderegg ◽  
Lawrence W. Cheuk ◽  
Yicheng Bao ◽  
Sean Burchesky ◽  
Wolfgang Ketterle ◽  
...  
Keyword(s):  
Standard Model ◽  
Ground State ◽  
Optical Tweezer ◽  
Precision Measurements ◽  
Full Potential ◽  
Beyond The Standard Model ◽  
Ultracold Molecules ◽  
The Standard Model ◽  
Calcium Monofluoride ◽  
Individual Particles

Ultracold molecules have important applications that range from quantum simulation and computation to precision measurements probing physics beyond the Standard Model. Optical tweezer arrays of laser-cooled molecules, which allow control of individual particles, offer a platform for realizing this full potential. In this work, we report on creating an optical tweezer array of laser-cooled calcium monofluoride molecules. This platform has also allowed us to observe ground-state collisions of laser-cooled molecules both in the presence and absence of near-resonant light.

scholarly journals Unleashing the full power of LHCb to probe Stealth New Physics

2021 ◽  
Author(s):  
Martino Borsato ◽  
Xabier Cid-Vidal ◽  
Yuhsin Tsai ◽  
Carlos Vázquez Sierra ◽  
Jose Francisco Zurita ◽  
...  
Keyword(s):  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Theoretical Models ◽  
New Physics ◽  
Precision Measurements ◽  
Beyond The Standard Model ◽  
Lhcb Experiment ◽  
The Standard Model ◽  
Full Power

Abstract In this paper, we describe the potential of the LHCb experiment to detect Stealth physics. This refers to dynamics beyond the Standard Model that would elude searches that focus on energetic objects or precision measurements of known processes. Stealth signatures include long-lived particles and light resonances that are produced very rarely or together with overwhelming backgrounds. We will discuss why LHCb is equipped to discover this kind of physics at the Large Hadron Collider and provide examples of well-motivated theoretical models that can be probed with great detail at the experiment.

scholarly journals Extraction of the Light Quark Mass Ratio from the Decaysψ′→J/ψπ0(η)

2009 ◽  
Vol 103 (8) ◽  
Author(s):  
Feng-Kun Guo ◽  
Christoph Hanhart ◽  
Ulf-G. Meißner
Keyword(s):  
Quark Mass ◽  
Light Quark ◽  
Mass Ratio ◽  
Light Quark Mass

scholarly journals Comprehensive analysis of beta decays within and beyond the Standard Model

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Adam Falkowski ◽  
Martín González-Alonso ◽  
Oscar Naviliat-Cuncic
Keyword(s):  
Standard Model ◽  
New Physics ◽  
Precision Measurements ◽  
Neutron Decay ◽  
Beyond The Standard Model ◽  
Time Data ◽  
Effective Interactions ◽  
Left Handed ◽  
The Standard Model ◽  
Beta Decays

Abstract Precision measurements in allowed nuclear beta decays and neutron decay are reviewed and analyzed both within the Standard Model and looking for new physics. The analysis incorporates the most recent experimental and theoretical developments. The results are interpreted in terms of Wilson coefficients describing the effective interactions between leptons and nucleons (or quarks) that are responsible for beta decay. New global fits are performed incorporating a comprehensive list of precision measurements in neutron decay, superallowed 0+→ 0+ transitions, and other nuclear decays that include, for the first time, data from mirror beta transitions. The results confirm the V-A character of the interaction and translate into updated values for Vud and gA at the 10−4 level. We also place new stringent limits on exotic couplings involving left-handed and right-handed neutrinos, which benefit significantly from the inclusion of mirror decays in the analysis.

scholarly journals CHARM: MIXING, CP VIOLATION AND RARE DECAYS AT LHCb

2014 ◽  
Vol 35 ◽  
pp. 1460414
Author(s):  
MICHAEL ALEXANDER ◽  
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Rare Decays ◽  
Branching Fractions ◽  
Charm Physics ◽  
Precision Measurements ◽  
Beyond The Standard Model ◽  
Mixing Parameters ◽  
The Standard Model ◽  
Wrong Sign

Recent results on mixing, CP violation and rare decays in charm physics from the LHCb experiment are presented. Study of "wrong-sign" D0 → K+π- decays provides the highest precision measurements to date of the mixing parameters x′2 and y′, and of CP violation in this decay mode. Direct and indirect CP violation in the D0 system are probed to a sensitivity of around 10-3 using D0 → K+K− and D0 → π+π− decays and found to be consistent with zero. Searches for the rare decays [Formula: see text], [Formula: see text] and D0 → μ+μ− find no evidence of signal, but set the best limits on branching fractions to date. Thus, despite many excellent results in charm physics from LHCb, no evidence for physics beyond the Standard Model is found.

scholarly journals Constraints on the NMSSM from the Oblique Parameters

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Markos Maniatis ◽  
York Schröder
Keyword(s):  
Standard Model ◽  
Parameter Space ◽  
Gauge Boson ◽  
Precision Measurements ◽  
Supersymmetric Model ◽  
Beyond The Standard Model ◽  
The Standard Model ◽  
Electroweak Precision ◽  
Minimal Supersymmetric Model

Electroweak precision measurements, encoded in the oblique parameters, give strong constraints on physics beyond the Standard Model. The oblique parametersS,T,U(V,W,X)are calculated in the next-to-minimal supersymmetric model (NMSSM). We outline the calculation of the oblique parameters in terms of one-loop gauge-boson self-energies and find sensitive restrictions for the NMSSM parameter space.

Beyond the Standard Model

2017 ◽  
Author(s):  
Laurent Baulieu ◽  
John Iliopoulos ◽  
Roland Sénéor
Keyword(s):  
Field Theory ◽  
General Relativity ◽  
Supergravity Models ◽  
Standard Model ◽  
Field Theories ◽  
Beyond The Standard Model ◽  
Super Symmetry ◽  
The Standard Model ◽  
Topological Field ◽  
Supersymmetric Theories

The motivation for supersymmetry. The algebra, the superspace, and the representations. Field theory models and the non-renormalisation theorems. Spontaneous and explicit breaking of super-symmetry. The generalisation of the Montonen–Olive duality conjecture in supersymmetric theories. The remarkable properties of extended supersymmetric theories. A brief discussion of twisted supersymmetry in connection with topological field theories. Attempts to build a supersymmetric extention of the standard model and its experimental consequences. The property of gauge supersymmetry to include general relativity and the supergravity models.

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