Inclusive semileptonic b c ν ¯ $$ b\to c\ell \overline{\nu} $$ decays to order 1 / m b 5 $$ 1/{m}_b^5 $$

Thomas Mannel (Theoretische Physik 1, Center for Particle Physics Siegen, Universität Siegen, Siegen, D-57068, Germany) ; Ilija Milutin (Theoretische Physik 1, Center for Particle Physics Siegen, Universität Siegen, Siegen, D-57068, Germany) ; K. Vos (Gravitational Waves and Fundamental Physics (GWFP), Maastricht University, Duboisdomein 30, Maastricht, GT, NL-6229, the Netherlands; Nikhef, Science Park 105, Amsterdam, NL-1098 XG, the Netherlands)

Inclusive semileptonic B X c ν ¯ $$ B\to {X}_c\ell \overline{\nu} $$ decays can be described in the Heavy Quark Expansion (HQE) and allow for a precision determination of the CKM element |V cb |. We calculate the terms of 1 / m b 5 $$ 1/{m}_b^5 $$ and derive a “trace formula” which allows for the computation of the decay rate and kinematic moments of the spectrum up to this order in the HQE. We focus specifically on the reparametrization invariant (RPI) dilepton invariant mass q 2 moments of the spectrum, which depend on a reduced set of HQE parameters. At this order, “intrinsic charm” (IC) contributions proportional to 1 / m b 3 m c 2 $$ 1/\left({m}_b^3{m}_c^2\right) $$ enter, which are numerically expected to be sizeable. Using the “lowest-lying state saturation ansatz” (LLSA), we estimate the size of these contributions. Within this approximation, we observe a partial cancellation between the IC and the “genuine” 1 / m b 5 $$ 1/{m}_b^5 $$ contributions, resulting in a small overall contribution.

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      "surname": "Milutin", 
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      "surname": "Vos", 
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      "title": "Inclusive semileptonic   <math> <mi>b</mi> <mo>\u2192</mo> <mi>c</mi> <mi>\u2113</mi> <mover> <mi>\u03bd</mi> <mo>\u00af</mo> </mover> </math>  $$ b\\to c\\ell \\overline{\\nu} $$  decays to order   <math> <mn>1</mn> <mo>/</mo> <msubsup> <mi>m</mi> <mi>b</mi> <mn>5</mn> </msubsup> </math>  $$ 1/{m}_b^5 $$"
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  "abstracts": [
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      "source": "Springer", 
      "value": "Inclusive semileptonic   <math> <mi>B</mi> <mo>\u2192</mo> <msub> <mi>X</mi> <mi>c</mi> </msub> <mi>\u2113</mi> <mover> <mi>\u03bd</mi> <mo>\u00af</mo> </mover> </math>  $$ B\\to {X}_c\\ell \\overline{\\nu} $$  decays can be described in the Heavy Quark Expansion (HQE) and allow for a precision determination of the CKM element |V  cb |. We calculate the terms of   <math> <mn>1</mn> <mo>/</mo> <msubsup> <mi>m</mi> <mi>b</mi> <mn>5</mn> </msubsup> </math>  $$ 1/{m}_b^5 $$  and derive a \u201ctrace formula\u201d which allows for the computation of the decay rate and kinematic moments of the spectrum up to this order in the HQE. We focus specifically on the reparametrization invariant (RPI) dilepton invariant mass q 2 moments of the spectrum, which depend on a reduced set of HQE parameters. At this order, \u201cintrinsic charm\u201d (IC) contributions proportional to   <math> <mn>1</mn> <mo>/</mo> <mfenced> <mrow> <msubsup> <mi>m</mi> <mi>b</mi> <mn>3</mn> </msubsup> <msubsup> <mi>m</mi> <mi>c</mi> <mn>2</mn> </msubsup> </mrow> </mfenced> </math>  $$ 1/\\left({m}_b^3{m}_c^2\\right) $$  enter, which are numerically expected to be sizeable. Using the \u201clowest-lying state saturation ansatz\u201d (LLSA), we estimate the size of these contributions. Within this approximation, we observe a partial cancellation between the IC and the \u201cgenuine\u201d   <math> <mn>1</mn> <mo>/</mo> <msubsup> <mi>m</mi> <mi>b</mi> <mn>5</mn> </msubsup> </math>  $$ 1/{m}_b^5 $$  contributions, resulting in a small overall contribution."
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Published on:
28 February 2024
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2024 (2024)
Issue 2
Pages 1-32
DOI:
https://doi.org/10.1007/JHEP02(2024)226
arXiv:
2311.12002
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: