Book/Dissertation / PhD Thesis

PUBDB-2024-05764

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measurement of Charm Production in CMS and Total Charm Cross Section with Non-Universal Charm Fragmentation

Yang, Y. (Corresponding author)DESY* ; Geiser, A. (Thesis advisor)DESY* ; Moch, S.-O. (Thesis advisor)Extern*

2024
Verlag Deutsches Elektronen-Synchrotron DESY Hamburg

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Please use a persistent id in citations: urn:nbn:de:gbv:18-ediss-120900  doi:10.3204/PUBDB-2024-05764

Report No.: DESY-THESIS-2024-013

Abstract: This thesis presents differential and total charm cross section measurements at various centerof-mass energies in $pp$ collisions. For the purpose of measuring the total charm cross section,the D$^{∗+}$ differential cross sections are measured at $\sqrt{s}$ = 7, 0.9 and 13 TeV in the CMSdetector by covering the largest possible phase space, resulting in the smallest extrapolation factor ever introduced at the LHC. The measured fiducial cross sections are extrapolated to thetotal cross section using a data-driven parametrization which is introduced for the first time tobe applied to all the weakly-decaying ground states in $pp$ collisions with non-universal charmfragmentation. Also adding other LHC measurements, the total charm-pair cross sections aremeasured at $\sqrt{s}$ = 0.9, 5, 7, and 13 TeV to be 1.83$\substack{+0.35 \\ −0.37}$, 8.43$\substack{+1.055 \\ −1.16}$, 9.39$\substack{+1.35 \\ −1.49}$, and 17.43$\substack{+2.10 \\ −2.57}$ mb, respectively. These measurements supersede all the earlier LHC measurements which werederived under the fragmentation universality assumption, and show consistency with NNLOQCD theory predictions. The measurement of the total charm cross section as a function ofthe center-of-mass energy can be used to constrain QCD parameters. The very first exampleis shown to constrain the charm mass and the parton distribution functions particularly in thelow-$x$ region.

Note: Dissertation, Universität Hamburg, 2024

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. PHGS, VH-GS-500 - PIER Helmholtz Graduate School (2015_IFV-VH-GS-500) (2015_IFV-VH-GS-500)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2024

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Database coverage:

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