Model-independent bounds on R(J/ψ)
High Energy Physics - Phenomenology
High Energy Physics - Lattice
Nuclear Theory
Nuclear and particle physics. Atomic energy. Radioactivity
0103 physical sciences
Heavy Quark Physics
Lattice QCD
QC770-798
01 natural sciences
Quark Masses and SM Parameters
High Energy Physics - Experiment
DOI:
10.1007/jhep09(2018)168
Publication Date:
2018-09-29T05:26:41Z
AUTHORS (3)
ABSTRACT
A bstract We present a model-independent bound on $$ R\left(J/\psi \right)\equiv \mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to J/\psi {\tau}^{+}{\nu}_{\tau}\right)/\mathrm{\mathcal{B}}\mathrm{\mathcal{R}}\left({B}_C^{+}\to {\mu}^{+}{\nu}_{\mu}\right) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>R</mml:mi> <mml:mfenced> <mml:mrow> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> </mml:mrow> </mml:mfenced> <mml:mtext>≡</mml:mtext> <mml:mi>ℬ</mml:mi> <mml:mi>ℛ</mml:mi> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>C</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>τ</mml:mi> </mml:msup> <mml:msub> <mml:mi>ν</mml:mi> </mml:msub> <mml:mi>µ</mml:mi> </mml:math> . This is constructed by constraining the form factors through combination of dispersive relations, heavy-quark relations at zero-recoil, and limited existing determinations from lattice QCD. The resulting 95% confidence-level bound, 0.20 ≤ R ( J / ψ ) 0.39, agrees with recent LHCb result 1.3 σ , rules out some previously suggested model factors.
SUPPLEMENTAL MATERIAL
Coming soon ....
REFERENCES (65)
CITATIONS (34)
EXTERNAL LINKS
PlumX Metrics
RECOMMENDATIONS
FAIR ASSESSMENT
Coming soon ....
JUPYTER LAB
Coming soon ....