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LHCb Posters

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2022-08-10
14:25
LHCb New measurements in fixed-target collisions at LHCb
Reference: Poster-2022-1077
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 a poorly explored 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 $p$He, $p$Ne, 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:
LHCb poster
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2022-07-14
15:39
Probe for Luminosity Measurement at LHCb
Reference: Poster-2022-1076
Created: 2022. -1 p
Creator(s): Spedicato, Eugenia

A new detector capable of measuring the LHC luminosity has been installed at the interaction point of LHCb. It is named Probe for LUminosity MEasurement - PLUME. This detector is undergoing commissioning and will operate throughout LHC Run 3. It will enable real time monitoring of beam condition parameters such as luminosity, number of visible interactions per bunch crossing, background; it will cross-check the LHC filling scheme in real time, and contribute to the centrality determination for the LHCb fixed-target programme. The detector is based on the detection of Cherenkov light produced in quartz material by charged particles coming upstream from the LHCb collision region. PLUME is charged with providing both online and offline measurements with a time response that can be as fast as a fraction of a second, and it will ensure the vital luminosity-levelling procedure at LHCb and act as real-time alarm for LHC.

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2022-07-14
15:34
The NTuple Wizard An NTuple production service for accessing LHCb Open Data
Reference: Poster-2022-1075
Created: 2014. -1 p
Creator(s): O'Neil, Ryunosuke

Making the large datasets collected at the LHC accessible to the public is a considerable challenge given the complexity and volume of data. Yet to harness the full scientific potential of the facility, it is essential to enable meaningful access to the data by the broadest physics community possible. Here we present a tool, the LHCb NTuple Wizard, which leverages the existing computing infrastructure available to the LHCb collaboration in order to enable third-party users to request derived data samples in the same format used in LHCb physics analysis. An intuitive web interface allows for the discovery of accessible datasets and guides the user through the process of specifying a request for producing NTuples: an ordered set of particle or decay candidates cataloging measured quantities chosen by the user. Issues of computer security and access control arising from offering this service are addressed within its design, while still offering datasets suitable for scientific research through the CERN Open Data Portal.

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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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2022-05-05
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
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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
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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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