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Multidifferential study of identified charged hadron distributions in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=$13 TeV

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Abstract

Jet fragmentation functions are measured for the first time in proton-proton collisions for charged pions, kaons, and protons within jets recoiling against a $Z$ boson. The charged-hadron distributions are studied longitudinally and transversely to the jet direction for jets with transverse momentum 20 $< p_{\textrm{T}} < 100$ GeV and in the pseudorapidity range $2.5 < \eta < 4$. The data sample was collected with the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.64 fb$^{-1}$. Triple differential distributions as a function of the hadron longitudinal momentum fraction, hadron transverse momentum, and jet transverse momentum are also measured for the first time. This helps constrain transverse-momentum-dependent fragmentation functions. Differences in the shapes and magnitudes of the measured distributions for the different hadron species provide insights into the hadronization process for jets predominantly initiated by light quarks.

Figures and captions

Distributions of (top) the longitudinal momentum fraction and (bottom) the transverse momentum of charged hadrons (pions, kaons, and protons combined) with respect to the jet axis in three jet $ p_{\mathrm{T}}$ intervals and (right) comparisons with previous results at $\sqrt{s} = 8$ TeV for jets with 20 $< p_{\mathrm{T}} <$ 30 GeV [25]. Statistical (systematic) uncertainties are shown in bars (boxes).

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Double differential JFFs of the longitudinal momentum fraction $ z$ and the transverse momentum $ j_{\mathrm{T}}$ of charged hadrons (pions, kaons, and protons combined) in three jet $ p_{\mathrm{T}}$ intervals.

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Collinear jet fragmentation functions of (top) identified pions, kaons and protons in three jet $ p_{\mathrm{T}}$ intervals and (bottom) the ratios of kaons to pions and protons to pions. Statistical (systematic) uncertainties are shown in bars (boxes).

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Joint distributions of the longitudinal momentum fraction $ z$ and the transverse momentum $ j_{\mathrm{T}}$ of identified charged (left) pions, (middle) kaons and (right) protons in jets with 20 $< p_{\mathrm{T}} <$ 30 GeV.

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Animated gif made out of all figures.

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Supplementary Material [file]

Figure1-S.pdf [178 KiB]
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Figure2-S.pdf [171 KiB]
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supple[..].pdf [1 MiB]
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supplementary_v2.pdf

Created on 13 April 2024.