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CERN Accelerating science

Posters

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2022-06-17
14:48
New measurements in fixed-target collisions at LHCb
Reference: Poster-2022-1074
Created: 2022. -6 p
Creator(s): Sellam, Sara

The LHCb spectrometer has the unique capability to function as a fixed-target experiment by injecting gas into the LHC beampipe while proton or ion beams are circulating. The resulting beam+gas collisions cover an unexplored energy range that is above previous fixed-target experiments, but below the top RHIC energy for AA collisions. Here we present new results on antiproton and charm production from pHe, pNe, and PbNe fixed-target collisions at LHCb. Comparisons with various theoretical models of particle production and transport through the nucleus will be discussed.

© CERN Geneva

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2022-06-16
12:31
LHCb : Heavy Flavor and Exotic Production at LHCb
Reference: Poster-2022-1073
Created: 2022. -5 p
Creator(s): Smith, Krista Lizbeth

Heavy quark production is an important experimental observable that sheds light on the heavy quark interaction with the nuclear medium. With high statistics datasets, tracking and PID at very low transverse momentum, and excellent vertexing capabilities, LHCb performs precision measurements of a rich set of heavy flavor hadrons, including open charm hadrons and charmonia. These capabilities allow for precise studies of charm production, baryon enhancement and charmonia suppression in various colliding systems from $pp$ to $p$Pb and PbPb. Furthermore, the production of the exotic $\chi$(3872) and $T_{cc}^{+}$ hadrons in $pp$ and $p$Pb collisions is also studied. We will present these results along with comparisons to theoretical calculations.

Related links:
Conference The 20th International Conference on Strangeness in Quark Matter
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2022-05-10
15:49
Status of the CSM FPGA Irradiation Test for the HL-LHC ATLAS Muon Spectrometer Upgrade
Reference: Poster-2022-1072
Created: 2022. -1 p
Creator(s): Guhit, Jem Aizen Mendiola

The increased radiation environment and data rate for the High Luminosity Large Hadron Collider (HL-LHC) require upgrades to the readout electronics for the Muon Spectrometer ( MS ) electronics. In this talk, I will present the status of the irradiation studies for the chamber service module (CSM). The CSM is a custom-built front-end electronics board and is responsible for multiplexing data read out from on-detector electronics as well as passing configuration information to them. An important component of the CSM is a Field-programmable gate array (FPGA), specifically using the FPGA Artix7 xc7a35T, is responsible for fanout of configuration and control information for 18 mezzanine cards. The Artix-7 is a commercial component with a history of meeting our radiation specifications. The specific model used in the CSM was first tested for the Single Event Effects (SEE) at LANSCE. The model was tested in a radiation hard environment with an average flux 10^3 higher than ATLAS (6.02E+3 n/cm2/s vs 1.3E+6 n/cm2/s). Results show that the SEE test approximately had 3 years of ATLAS in comparison with ~1.9E+11n/cm2/y fluence (MDT CSM Requirement). One CSM board on average has approximately 9 errors in 3 years of ATLAS Run. The CSM was next tested for the Total Ionization Dose (TID) at BNL. The model was tested at a dose rate 7.675 kRad/hr. Results show that the total dose of all four irradiated test boards exceeded more than 3x the ATLAS RTC requirement of 10kRad dose.

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2022-05-05
09:10
LHCB - New measurements in fixed-target collisions at LHCb
Reference: Poster-2022-1071
Keywords:  smog  fixed-target collisions
Created: 2022. -1 p
Creator(s): Okamura, Shinichi

The LHCb spectrometer has the unique capability to function as a fixed-target experiment by injecting gas into the LHC beampipe while proton or ion beams are circulating. The resulting beam+gas collisions cover an unexplored energy range that is above previous fixed-target experiments, but below the top RHIC energy for AA collisions. Here we present new results on antiproton and charm production from pHe, pNe, and PbNe fixed-target collisions at LHCb. Comparisons with various theoretical models of particle production and transport through the nucleus will be discussed.

Related links:
DIS2022: XXIX International Workshop on Deep-Inelastic Scattering and Related Subjects
© CERN Geneva

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2022-04-22
11:16
Production of charm hadrons in $p$Pb collisions with LHCb
Reference: Poster-2022-1070
Created: 2022. -6 p
Creator(s): Luo, Yiheng

Open charm hadrons are collected by the LHCb detector in proton-lead collisions at $\sqrt{sNN}$=5.02 TeV. The excellent performance of particle reconstruction and identification in forward rapidity acceptance allows these charm states to be studied down to very low transverse momentum. This poster presents the LHCb measurement of the production of charm mesons, reconstructed in exclusive hadronic final states. Cold Nuclear Matter effects are studied, quantified by the nuclear modification factors, forward-backward production ratios. Comparisons to theoretical calculations, particularly the ones based on nuclear PDF, are also shown.

Related links:
XXIXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions
© CERN Geneva

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2022-04-20
11:57
Strangeness Enhancement in Small System at LHCb
Reference: Poster-2022-1069
Created: 2022. -6 p
Creator(s): Gu, Chenxi

The enhanced production of strangeness was first proposed as a signature of the quark gluon plasma creation in heavy ion collisions. Recently, increased strangeness production is also observed experimentally in high multiplicity small systems such as pp and pPb collisions, where formation of QGP is not expected. In this study, production of prompt $D^+$ and $D^+_s$ in pPb collisions is measured with the LHCb detector at center-of-mass energy $\sqrt{sNN}=8.16$ TeV. LHCb's unique forward coverage together with its precise tracking and vertexing provides the possibility to measure the charm hadrons at very low transverse momentum with high accuracy. In addition to the recent results of prompt $D^+$ and $D^+_s$ production, we will also present $D^+_s$ to $D^+$ production ratio as a function of multiplicity and its comparisons to theoretical models.

Related links:
XXIXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions
© CERN Geneva

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2022-04-19
16:58
Poster: Fragmentation functions of identified charmed mesons
Reference: Poster-2022-1068
Created: 2022. -6 p
Creator(s): Sellam, Sara

We present the progress of reconstructing the fragmentation functions of the charmed mesons, X(3872), ψ(2S) and Υ within reconstructed jets. The charmed mesons were measured within reconstructed anti-kT jets with R=0.5 in the pT range of 5 to 40GeV. The data stem from pp collisions at 13 TeV measured by the LHCb detector. The zT distributions of the mesons are reconstructed and compared to each other and to simulations. Since these mesons have very different quark contents, differences between their fragmentation might give insight into the underlying mechanisms of hadronization as well as the production mechanisms in the hard process in which they could be created.

Related links:
XXIXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions
© CERN Geneva

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2022-04-19
14:06
Prompt Λ+𝑐/𝐷0 ratio in peripheral PbPb collisions at 5.02 TeV by LHCb
Reference: Poster-2022-1067
Created: 2022. -6 p
Creator(s): Yang, Di

Coalescence hadronization in QGP would enhance Λ+𝑐/𝐷0 at intermediate 𝑝𝑇 and are supposed to occur in PbPb collisions. The charmed baryon to meson ratio, Λ+𝑐/𝐷0 ratio is sensitive to hadronization, can provide important information on the charm hadronization process and formation of QGP. Prompt Λ+𝑐/𝐷0 ratio are measured in peripheral PbPb collisions at 𝑠𝑁𝑁‾‾‾‾√=5.02 TeV by LHCb, and are measured up to 𝑝𝑇=8 GeV/c and in the rapidity region of 2.0 to 4.5. This poster presents the Λ+𝑐/𝐷0 ratio together with comparisons to ALICE results and calculations using pythia plus color recombination and other models.

Related links:
XXIXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions
© CERN Geneva

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2022-04-14
12:14
Studies on charm-strange baryon Ξc+ in 8.16 TeV pPb collisions with LHCb
Reference: Poster-2022-1066
Created: 2022. -6 p
Creator(s): Litvinov, Roman

The Ξc+ baryon is an open charm state comprised of an up, strange, and charm quark. For its peculiar composition with the presence of the strange quark, studies of baryon-to-baryon ratio of Ξc+ to Λc+ can provide valuable information on charm hadronization mechanisms, and possibly observe strangeness enhancement in small systems. We present the first study of Ξc+/Λc+ ratio in proton lead and lead proton collisions at the √s=8.16 TeV with the LHCb experiment. The baryons are reconstructed in their decay with a proton, a kaon, and a pion in about 30 nb−1 of data. The results will be compared to existing measurements in other collision systems and at different energies, and to recent theoretical predictions.

Related links:
XXIXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions
© CERN Geneva

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2022-04-14
11:54
Study of charmonium photoproduction in ultra-peripheral lead-lead collisions at LHCb
Reference: Poster-2022-1065
Created: 2022. -5 p
Creator(s): Wang, Xiaolin

The LHCb detector is a single-arm forward spectrometer covering the pseudorapidity range 2 < 𝜂 < 5, designed for the study of particles containing bottom or charm quark. The study of exclusive vector meson photoproduction in ultra-peripheral lead-lead collisions is essential to understand physics at low Bjorken x. In particular, coherent charmonium mesons are promising probes of nuclear shadowing due to their sensitivity to the nuclear parton distribution function of gluons. In this presentation, we report the measurements of the differential coherent cross section productions as a function of rapidity for J/ψ meson in ultra-peripheral PbPb collisions at a nucleon-nucleon centre-of-mass energy of 5.02TeV. The J/ψ mesons are reconstructed in the dimuon decay channel using a data sample collected by the LHCb experiment in 2015, corresponding to an integrated luminosity about 10𝜇𝑏^(−1). The comparisons with theoretical predictions are also presented. More precise result from 2018 would come soon !

Related links:
XXIXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions
© CERN Geneva

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Open Days 2013 Posters (58)
Open Days 2019 Posters (299)