scholarly journals Dilepton production spectrum aboveTcwith a lattice quark propagator

2015 ◽  
Vol 92 (11) ◽  
Author(s):  
Taekwang Kim ◽  
Masayuki Asakawa ◽  
Masakiyo Kitazawa
Keyword(s):  
Quark Propagator ◽  
Dilepton Production ◽  
Production Spectrum

scholarly journals Photon production spectrum above Tc with a lattice quark propagator

2018 ◽  
Vol 2018 (1) ◽  
Author(s):  
Taekwang Kim ◽  
Masayuki Asakawa ◽  
Masakiyo Kitazawa
Keyword(s):  
Quark Propagator ◽  
Photon Production ◽  
Production Spectrum

scholarly journals Contribution of the Darwin operator to non-leptonic decays of heavy quarks

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Alexander Lenz ◽  
Maria Laura Piscopo ◽  
Aleksey V. Rusov
Keyword(s):  
Standard Technique ◽  
Quark Propagator ◽  
Leptonic Decay ◽  
Leptonic Decays ◽  
Interference Contribution ◽  
The Standard Model ◽  
Strength Tensor ◽  
Quark Flavour ◽  
Quark Decay ◽  
B Quark

Abstract We compute the Darwin operator contribution ($$ 1/{m}_b^3 $$ 1 / m b 3 correction) to the width of the inclusive non-leptonic decay of a B meson (B+, Bd or Bs), stemming from the quark flavour-changing transition b → $$ {q}_1{\overline{q}}_2{q}_3 $$ q 1 q ¯ 2 q 3 , where q1, q2 = u, c and q3 = d, s. The key ideas of the computation are the local expansion of the quark propagator in the external gluon field including terms with a covariant derivative of the gluon field strength tensor and the standard technique of the Heavy Quark Expansion (HQE). We confirm the previously known expressions of the $$ 1/{m}_b^3 $$ 1 / m b 3 contributions to the semi-leptonic decay b → $$ {q}_1\mathrm{\ell}{\overline{\nu}}_{\mathrm{\ell}} $$ q 1 ℓ ν ¯ ℓ , with ℓ = e, μ, τ and of the $$ 1/{m}_b^2 $$ 1 / m b 2 contributions to the non-leptonic modes. We find that this new term can give a sizeable correction of about −4 % to the non-leptonic decay width of a B meson. For Bd and Bs mesons this turns out to be the dominant correction to the free b-quark decay, while for the B+ meson the Darwin term gives the second most important correction — roughly 1/2 to 1/3 of the phase space enhanced Pauli interference contribution. Due to the tiny experimental uncertainties in lifetime measurements the incorporation of the Darwin term contribution is crucial for precision tests of the Standard Model.

scholarly journals Exclusive dilepton production via timelike Compton scattering in heavy ion collisions

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
G. M. Peccini ◽  
L. S. Moriggi ◽  
M. V. T. Machado
Keyword(s):  
Compton Scattering ◽  
Heavy Ion Collisions ◽  
Heavy Ion ◽  
Dilepton Production ◽  
Ion Collisions

scholarly journals THE QUARK CONDENSATE IN THE GELL-MANN-OAKES-RENNER RELATION

1996 ◽  
Vol 11 (16) ◽  
pp. 1331-1337 ◽  
Author(s):  
K. LANGFELD ◽  
C. KETTNER
Keyword(s):  
Quark Propagator ◽  
Quark Condensate ◽  
Usual Definition ◽  
Gluon Exchange ◽  
Current Mass ◽  
Definition Of

The quark condensate which enters the Gell-Mann-Oakes-Renner (GMOR) relation, is investigated in the framework of one-gluon-exchange models. The usual definition of the quark condensate via the trace of the quark propagator produces a logarithmic divergent condensate. In the product of current mass and condensate, this divergence is precisely compensated by the bare current mass. The finite value of the product in fact does not contradict the relation recently obtained by Cahill and Gunner. Therefore the GMOR relation is still satisfied.

Intermediate Mass Dilepton Production in an Expanding Baryon-rich Quark-Gluon Matter

2001 ◽  
Vol 18 (2) ◽  
pp. 199-201 ◽  
Author(s):  
He Ze-Jun ◽  
Jiang Wei-Zhou ◽  
Zhou Wen-Jie ◽  
Zhang Jia-Ju
Keyword(s):  
Dilepton Production ◽  
Intermediate Mass
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