A lattice study of the exclusive decay amplitude, using the Clover action at β = 6.0

Abstract We derive relations between finite-volume matrix elements and infinite-volume decay amplitudes, for processes with three spinless, degenerate and either identical or non-identical particles in the final state. This generalizes the Lellouch-Lüscher relation for two-particle decays and provides a strategy for extracting three-hadron decay amplitudes using lattice QCD. Unlike for two particles, even in the simplest approximation, one must solve integral equations to obtain the physical decay amplitude, a consequence of the nontrivial finite-state interactions. We first derive the result in a simplified theory with three identical particles, and then present the generalizations needed to study phenomenologically relevant three-pion decays. The specific processes we discuss are the CP-violating K → 3π weak decay, the isospin-breaking η → 3π QCD transition, and the electromagnetic γ* → 3π amplitudes that enter the calculation of the hadronic vacuum polarization contribution to muonic g − 2.

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Calculation of the three-body decay amplitude with high-order Fierz transformation

Journal of Physics G Nuclear and Particle Physics ◽

10.1088/0954-3899/35/9/095001 ◽

2008 ◽

Vol 35 (9) ◽

pp. 095001 ◽

Cited By ~ 1

Author(s):

Hong Chen ◽

Rong-Gang Ping

Keyword(s):

Decay Amplitude ◽

High Order ◽

Three Body

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Factorization at subleading power and endpoint divergences in h → γγ decay. Part II. Renormalization and scale evolution

Journal of High Energy Physics ◽

10.1007/jhep01(2021)077 ◽

2021 ◽

Vol 2021 (1) ◽

Author(s):

Ze Long Liu ◽

Bianka Mecaj ◽

Matthias Neubert ◽

Xing Wang

Keyword(s):

Decay Amplitude ◽

Factorization Theorem ◽

Effective Theory ◽

Operator Matrix ◽

Quark Loop ◽

Perfect Agreement ◽

Soft Collinear Effective Theory ◽

Convolution Integrals ◽

Factorization Formula ◽

Massless Quark

Abstract Building on the recent derivation of a bare factorization theorem for the b-quark induced contribution to the h → γγ decay amplitude based on soft-collinear effective theory, we derive the first renormalized factorization theorem for a process described at subleading power in scale ratios, where λ = mb/Mh « 1 in our case. We prove two refactorization conditions for a matching coefficient and an operator matrix element in the endpoint region, where they exhibit singularities giving rise to divergent convolution integrals. The refactorization conditions ensure that the dependence of the decay amplitude on the rapidity regulator, which regularizes the endpoint singularities, cancels out to all orders of perturbation theory. We establish the renormalized form of the factorization formula, proving that extra contributions arising from the fact that “endpoint regularization” does not commute with renormalization can be absorbed, to all orders, by a redefinition of one of the matching coefficients. We derive the renormalization-group evolution equation satisfied by all quantities in the factorization formula and use them to predict the large logarithms of order $$ {\alpha \alpha}_s^2{L}^k $$ αα s 2 L k in the three-loop decay amplitude, where $$ L=\ln \left(-{M}_h^2/{m}_b^2\right) $$ L = ln − M h 2 / m b 2 and k = 6, 5, 4, 3. We find perfect agreement with existing numerical results for the amplitude and analytical results for the three-loop contributions involving a massless quark loop. On the other hand, we disagree with the results of previous attempts to predict the series of subleading logarithms $$ \sim {\alpha \alpha}_s^n{L}^{2n+1} $$ ∼ αα s n L 2 n + 1 .

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Measurement of the Lifetime of theBs0Meson Using the Exclusive Decay ModeBs0→J/ψφ

Physical Review Letters ◽

10.1103/physrevlett.77.1945 ◽

1996 ◽

Vol 77 (10) ◽

pp. 1945-1949 ◽

Cited By ~ 12

Author(s):

F. Abe ◽

H. Akimoto ◽

A. Akopian ◽

M. G. Albrow ◽

S. R. Amendolia ◽

...

Keyword(s):

Exclusive Decay

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Fourth generation effects in rare exclusive decay

Nuclear Physics B ◽

10.1016/s0550-3213(00)00378-3 ◽

2000 ◽

Vol 585 (1-2) ◽

pp. 275-289 ◽

Cited By ~ 23

Author(s):

T.M. Aliev ◽

A. Özpineci ◽

M. Savcı

Keyword(s):

Fourth Generation ◽

Exclusive Decay

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SCALAR SPECTRUM FROM A DYNAMICAL GRAVITY/GAUGE MODEL

International Journal of Modern Physics D ◽

10.1142/s0218271810018001 ◽

2010 ◽

Vol 19 (08n10) ◽

pp. 1351-1356 ◽

Cited By ~ 7

Author(s):

W. DE PAULA ◽

T. FREDERICO

Keyword(s):

Experimental Data ◽

High Spin ◽

Wilson Loop ◽

Decay Amplitude ◽

Gauge Model ◽

Regge Trajectories ◽

Mass Gap ◽

Pseudo Scalar ◽

Good Agreement

We show that a dynamical AdS/QCD model is able to reproduce the linear Regge trajectories for the light-flavor sector of mesons with high spin and also for the scalar and pseudo-scalar ones. In addition the model has confinement by the Wilson loop criteria and a mass gap. We also calculate the decay amplitude of scalars into two pion with a good agreement with the available experimental data.

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P1622Cancer drugs induce functional and structural impairment in adult cardiomyocytes

European Heart Journal ◽

10.1093/eurheartj/ehz748.0381 ◽

2019 ◽

Vol 40 (Supplement_1) ◽

Author(s):

C Altomare ◽

V Biemmi ◽

E Torre ◽

M Rocchetti ◽

M Ferrandi ◽

...

Keyword(s):

Sarcoplasmic Reticulum ◽

Structural Changes ◽

Decay Amplitude ◽

Sampling Rate ◽

Growth Factor Receptor ◽

Cellular Mechanisms ◽

Systolic Volume ◽

Functional Changes ◽

Time To Peak

Abstract Introduction The addition of anti-human epidermal growth factor receptor 2 (HER2; ErbB2) monoclonal antibody Trastuzumab (TRZ) to Doxorubicin (DOXO) chemotherapy is associated with a synergistic increase in cardiac toxicity. While previous studies have addressed the toxicity of both agents on isolated cardiomyocytes (CMs), little is known regarding this process in vivo, especially with respect to electrophysiological changes. Purpose To investigate electrical and structural changes in LV and RV CMs using an in vivo rat model of DOXO/TRZ cardiotoxicity. Methods Rats received 6 IP injections of either DOXO or TRZ over a 2-week period, or 6 doses of DOXO followed by 6 doses of TRZ (COMBO), or saline as a control. In-vivo echocardiography was performed. Electrical activity and Ca2+ handling were assessed in LV and RV CMs from rat hearts. Single cell patch-clamp and field stimulation experiments were performed. Spontaneous sarcoplasmic reticulum Ca2+ release events (Ca2+ sparks) were recorded at x100 magnification in line-scan mode (sampling rate 0.7 kHz) from 2 μM Fluo4-AM loaded CMs. To assess T-tubular disarray, CMs were incubated with di-3-ANEPPDHQ and periodic component was quantified by Fast Fourier Transform (FFT) analysis of confocal microscopy images. Results DOXO, and to a greater extent COMBO treatment was associated with significant increases in both LV end-systolic and end-diastolic volumes, and decreases in LVEF and fractional shortening. By contrast, TRZ alone merely increased LV end-systolic volume. Electrophysiological studies showed increases in action potential duration (APD), beat-to-beat variability of repolarization (BVR), delayed after depolarizations (DADs), and Ca2+-sparks in both DOXO and COMBO groups. Stimulated intracellular Ca2+ transients (1,2 and 4 Hz) showed significant changes with respect to time to peak, tau decay, amplitude, and fractional release in the DOXO group. These changes were associated with a significant downregulation of sarco/endoplasmic reticulum Ca2+ ATPase pump (SERCA) expression. From a structural viewpoint, these changes were associated with T-tubular disarray in the DOXO and COMBO groups. Conclusions DOXO, and to a greater extent COMBO treatment (but not TRZ alone) cause LV dysfunction in vivo. Moreover, both DOXO and COMBO treatments, but not TRZ alone, induce electrophysiological abnormalities and both structural and functional changes in the sarcoplasmic reticulum. These findings provide novel insights into the cellular mechanisms of CM dysfunction and arrhythmias associated with combined DOXO/TRZ therapy. Acknowledgement/Funding Swiss League against Cancer

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Determining the strong phase of the a1 meson decay amplitude using the W→ντ(→νa1(→π∓π∓π±)) process

Physical Review D ◽

10.1103/physrevd.101.034023 ◽

2020 ◽

Vol 101 (3) ◽

Author(s):

Kaoru Hagiwara ◽

Hiroyuki Ishida ◽

Toshifumi Yamada ◽

Daneng Yang

Keyword(s):

Decay Amplitude ◽

Meson Decay ◽

Strong Phase

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A VADEMECUM ON QUARK–HADRON DUALITY

International Journal of Modern Physics A ◽

10.1142/s0217751x01005535 ◽

2001 ◽

Vol 16 (32) ◽

pp. 5201-5248 ◽

Cited By ~ 42

Author(s):

IKAROS BIGI ◽

NIKOLAI URALTSEV

Keyword(s):

Decay Amplitude ◽

Percent Level ◽

Charm Quark ◽

Limiting Factor ◽

Strong Suppression ◽

Local Duality ◽

Charm Quark Mass ◽

Fresh Perspective ◽

Model Independent ◽

Hadron Duality

We present an elementary introduction to the problem of quark–hadron duality and its practical limitations, in particular as it concerns local duality violation in inclusive B meson decays. We show that the accurate definition of duality violation elaborated over the recent years allows one to derive informative constraints on violations of local duality. The magnitude of duality violation is particularly restricted in the total semileptonic widths. This explains its strong suppression in concrete dynamical estimates. We analyze the origin of the suppression factors in a model-independent setting, including a fresh perspective on the small velocity expansion. A new potentially significant mechanism for the violation of local duality in Γ sl (B) is analyzed. Yet we conclude that the amount of duality violation in Γ sl (B) must be safely below the half percent level, with realistic estimates being actually much smaller. The violation of local duality in Γ sl (B) is thus far below the level relevant to phenomenology. We also present a cautionary note on the B→D* decay amplitude at zero recoil and show that it is much more vulnerable to violations of quark–hadron duality than Γ sl (B). A critical review of some recent literature is given. We point out that the presently limiting factor in genuinely model-independent extraction of Vcb is the precise value of the short-distance charm quark mass. We suggest a direct and precise experimental check of local quark–hadron duality in semileptonic B→ Xcℓν decays.

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