Wald, Marcel

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Wald, Marcel
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    Higher twist corrections to 𝐵 -meson decays into a proton and dark antibaryon from QCD light-cone sum rules
    (2024)
    Boushmelev, Anastasia 
    ;
    Wald, Marcelorcid-logo
    The <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>B</a:mi></a:math>-mesogenesis framework anticipates decays of <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>B</c:mi></c:math> mesons into a dark antibaryon <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi mathvariant="normal">Ψ</e:mi></e:math> and various Standard Model baryons. Here, we focus on the exclusive decay process <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"><h:mi>B</h:mi><h:mo stretchy="false">→</h:mo><h:mi>p</h:mi><h:mi mathvariant="normal">Ψ</h:mi></h:math> observed as a proton and missing energy in the final state and determine the decay width by employing the QCD light-cone sum rule framework. We include all contributions up to twist six to the nucleon distribution amplitudes in order to parametrize the nonperturbative effects in the operator product expansion. We obtain the decay width and branching fraction with respect to the mass <l:math xmlns:l="http://www.w3.org/1998/Math/MathML" display="inline"><l:msub><l:mi>m</l:mi><l:mi mathvariant="normal">Ψ</l:mi></l:msub></l:math> of the dark antibaryon <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"><o:mi mathvariant="normal">Ψ</o:mi></o:math>. Published by the American Physical Society 2024
    Source Type:Article
    DOI:10.1103/PhysRevD.109.055049
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    The NNLO gluon beam function for jet-veto resummation
    (2024)
    Bell, Guido 
    ;
    Brune, Kevin 
    ;
    Das, Goutamorcid-logo
    ;
    Shao, Ding Yu 
    ;
    Wald, Marcelorcid-logo
    We compute the gluon beam function for jet-veto resummation to next-to-next-to-leading order (NNLO) in the strong-coupling expansion. Our calculation is based on an automated framework that was previously used for the computation of the respective quark beam function, and which we significantly extended for the present calculation. In particular, the perturbative matching kernels are directly calculated in momentum space, without the need to perform an additional Mellin transform. We present results for both gluon and quark-initiated processes, which we cross-checked with an independent semi-analytical method that exploits the similarity of the beam functions to the more familiar case of transverse-momentum resummation. Our computation is relevant for jet-veto resummations at NNLL′ accuracy.
    Source Type:Article
    DOI:10.1007/jhep07(2024)014
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    The NNLO quark beam function for jet-veto resummation
    (2023)
    Bell, Guido 
    ;
    Brune, Kevin 
    ;
    Das, Goutamorcid-logo
    ;
    Wald, Marcelorcid-logo
    We consider the quark beam function that describes collinear initial-state radiation that is constrained by a veto on reconstructed jets. As the veto is imposed on the transverse momenta of the jets, the beam function is subject to rapidity divergences, and we use the collinear-anomaly framework to extract the perturbative matching kernels to next-to-next-to-leading order (NNLO) in the strong-coupling expansion. Our calculation is based on a novel framework that automates the computation of beam functions in Mellin space and it provides the ingredients to extend jet-veto resummations for quark-initiated processes to NNLL′ accuracy.
    Source Type:Article
    DOI:10.1007/JHEP01(2023)083
      3