Multiplicity dependence of charm baryon and charm meson production in pPb collisions at <math altimg="si1.svg"><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><msub><mrow/><mrow><mi mathvariant="normal">NN</mi></mrow></msub></mrow></msub></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>8.16</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>

Benecke, Anna;Bruno, Giacomo;Caputo, Claudio;Delaere, Christophe;Bethani, Agni;et.al.
(2025) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 868 (2025)

Files

41187e4682e226c07b088ababf925e74.pdf
  • Open Access
  • Adobe PDF
  • 510.91 KB
Download

Details

Authors
Show more
Abstract
Measurements of the production yields of charm baryons (<math altimg="si103.svg"><msubsup><mrow><mi mathvariant="normal">Λ</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow><mi mathvariant="normal">c</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msubsup></math>) and charm mesons (<math altimg="si3.svg"><msubsup><mrow><mi mathvariant="normal">D</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow/><mrow><mn mathvariant="normal">0</mn></mrow></msubsup></math>) in proton-lead collisions at a nucleon-nucleon center-of-mass energy of 8.16 TeV are presented. The data were collected in 2016 with the CMS experiment and correspond to an integrated luminosity of 186 <math altimg="si4.svg"><mspace width="0.2em"/><msup><mrow><mtext>nb</mtext></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1</mn></mrow></msup></math>. The <math altimg="si103.svg"><msubsup><mrow><mi mathvariant="normal">Λ</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow><mi mathvariant="normal">c</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msubsup></math> baryon is reconstructed from the decay channel <math altimg="si5.svg"><msubsup><mrow><mi mathvariant="normal">Λ</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow><mi mathvariant="normal">c</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msubsup><mo stretchy="false">→</mo><msubsup><mrow><mi mathvariant="normal">K</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow><mi mathvariant="normal">S</mi></mrow><mrow><mn mathvariant="normal">0</mn></mrow></msubsup><mi mathvariant="normal">p</mi><msubsup><mrow/><mrow/><mrow/></msubsup></math>, while the <math altimg="si3.svg"><msubsup><mrow><mi mathvariant="normal">D</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow/><mrow><mn mathvariant="normal">0</mn></mrow></msubsup></math> meson is reconstructed via <math altimg="si43.svg"><msubsup><mrow><mi mathvariant="normal">D</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow/><mrow><mn mathvariant="normal">0</mn></mrow></msubsup><mo stretchy="false">→</mo><msubsup><mrow><mi mathvariant="normal">K</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow/><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo></mrow></msubsup><msubsup><mrow><mi mathvariant="normal">π</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow/><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msubsup></math>. The <math altimg="si103.svg"><msubsup><mrow><mi mathvariant="normal">Λ</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow><mi mathvariant="normal">c</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msubsup></math> baryon and <math altimg="si3.svg"><msubsup><mrow><mi mathvariant="normal">D</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow/><mrow><mn mathvariant="normal">0</mn></mrow></msubsup></math> meson yields are extracted in several charged-particle multiplicity classes. No strong multiplicity dependence of the <math altimg="si103.svg"><msubsup><mrow><mi mathvariant="normal">Λ</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow><mi mathvariant="normal">c</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msubsup></math>-to-<math altimg="si3.svg"><msubsup><mrow><mi mathvariant="normal">D</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow/><mrow><mn mathvariant="normal">0</mn></mrow></msubsup></math> yield ratio is observed, unlike the observed strange baryon to strange meson yield ratio of <math altimg="si7.svg"><mi mathvariant="normal">Λ</mi><mo stretchy="false">/</mo><mover accent="true"><mrow><mi mathvariant="normal">Λ</mi></mrow><mo>‾</mo></mover></math> to <math altimg="si8.svg"><msubsup><mrow><mi mathvariant="normal">K</mi></mrow><mrow/><mrow/></msubsup><msubsup><mrow/><mrow><mi mathvariant="normal">S</mi></mrow><mrow><mn mathvariant="normal">0</mn></mrow></msubsup></math>, which shows a strong multiplicity dependence. This observation indicates different mechanisms for the multiplicity evolution of hadronization processes for charm and strange quarks and provides new constraints to the understanding of heavy flavor production and collectivity in small collision systems.
Affiliations

Citations

  • APA
  • Chicago
  • FWB

Benecke, A., Bruno, G., Caputo, C., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Mondal, K., Tran, T. T., Wertz, S., CMS, Bethani, A., & et al. (2025). Multiplicity dependence of charm baryon and charm meson production in pPb collisions at <math altimg=“si1.svg”><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><msub><mrow/><mrow><mi mathvariant=“normal”>NN</mi></mrow></msub></mrow></msub></mrow></msqrt><mo linebreak=“goodbreak” linebreakstyle=“after”>=</mo><mn>8.16</mn><mspace width=“0.2em”/><mtext>TeV</mtext></math>. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 868. https://doi.org/10.1016/j.physletb.2025.139672 (Original work published 2025)