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The unexpected uses of a bowling pin: anisotropic flow in fixed-target $^{208}$Pb+$^{20}$Ne collisions as a probe of quark-gluon plasma
/ Giacalone, Giuliano (U. Heidelberg, ITP) ; Zhao, Wenbin (LBNL, NSD ; UC, Berkeley) ; Bally, Benjamin (IRFU, Saclay) ; Shen, Shihang (IAS, Julich) ; Duguet, Thomas (IRFU, Saclay ; KU Leuven, Dept. Phys. Astron.) ; Ebran, Jean-Paul (CEA DAM ; U. Paris-Saclay) ; Elhatisari, Serdar (Gaziantep U.) ; Frosini, Mikael (CEA Cadarache) ; Lähde, Timo A. (Julich, Forschungszentrum ; IAS, Julich ; JCHP, Julich ; JARA, Aachen) ; Lee, Dean (Michigan State U.) et al.
The System for Measuring Overlap with Gas (SMOG2) at the LHCb detector enables the study of fixed-target ion-ion collisions at relativistic energies ($\sqrt{s_{\rm NN}}\sim100$ GeV in the centre-of-mass). [...]
arXiv:2405.20210.
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The unexpected uses of a bowling pin: exploiting $^{20}$Ne isotopes for precision characterizations of collectivity in small systems
/ Giacalone, Giuliano (U. Heidelberg, ITP) ; Bally, Benjamin (IRFU, Saclay) ; Nijs, Govert (CERN) ; Shen, Shihang (IAS, Julich) ; Duguet, Thomas (IRFU, Saclay ; Leuven U.) ; Ebran, Jean-Paul (CEA DAM ; U. Paris-Saclay) ; Elhatisari, Serdar (Gaziantep U. ; Bonn U., HISKP ; U. Bonn, Phys. Inst., BCTP) ; Frosini, Mikael (CEA Cadarache) ; Lähde, Timo A. (IAS, Julich ; JCHP, Julich ; Unlisted, DE) ; Lee, Dean (Michigan State U.) et al.
Whether or not femto-scale droplets of quark-gluon plasma (QGP) are formed in so-called small systems at high-energy colliders is a pressing question in the phenomenology of the strong interaction. [...]
arXiv:2402.05995 ; CERN-TH-2024-021.
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Evidence for exotic hadron contributions to $\Lambda_b^0 \to J/\psi p \pi^-$ decays
/ LHCb collaboration
A full amplitude analysis of $\Lambda_b^0 \to J/\psi p \pi^-$ decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV $pp$ collisions, corresponding to an integrated luminosity of 3 fb$^{-1}$. A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations $N\to p\pi^-$, either the $P_c(4380)^+$ and $P_c(4450)^+\to J/\psi p$ states, previously observed in $\Lambda_b^0 \to J/\psi p K^-$ decays, or the $Z_c(4200)^-\to J/\psi \pi^-$ state, previously reported in $B^0 \to J/\psi K^+ \pi^-$ decays, or all three, are included in the amplitude models. [...]
arXiv:1606.06999; LHCB-PAPER-2016-015; CERN-EP-2016-151.-
Geneva : CERN, 2016-08-18 - 10 p.
APS Open Access Addendum: PhysRevLett.118.119901 - PDF; PhysRevLett.117.109902 - PDF; APS Open Access article: PDF; Fulltext: 10.1103_PhysRevLett.117.082003 - PDF; arXiv:1606.06999 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
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Measurement of the $CP$ asymmetry in $B^0_s -\overline B {^0 _s}$ mixing
/ LHCb Collaboration
The $CP$ asymmetry in the mixing of $B_s^0$ and $\overline{B}{}_s^0$ mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb$^{-1}$, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Semileptonic $B_s^0$ and $\overline{B}{}_s^0$ decays are studied in the inclusive mode $D_s^{\mp} \mu^{\pm} {^(}\overline {\nu} {^)} _{\mu} X$ with the $D_s^{\mp}$ mesons reconstructed in the $K^+ K^- \pi^{\mp}$ final state. [...]
arXiv:1605.09768; CERN-EP-2016-133; LHCB-PAPER-2016-013; LHCB-PAPER-2016-013; CERN-EP-2016-133.-
Geneva : CERN, 2016-08-05 - 9 p.
APS Open Access article: PDF; Addendum: PDF; Fulltext: arXiv:1605.09768 - PDF; 10.1103_PhysRevLett.117.061803 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Figures, tables and other information
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Measurement of the CKM angle $\gamma$ using $B^0 \rightarrow D K^{*0}$ with $D \rightarrow K^0_S \pi^+ \pi^-$ decays
/ LHCb collaboration
A model-dependent amplitude analysis of the decay $B^0\rightarrow D(K^0_S\pi^+\pi^-) K^{*0}$ is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb$^{-1}$, recorded at $\sqrt{s}=7$ and $8 TeV$ by the LHCb experiment. The CP violation observables $x_{\pm}$ and $y_{\pm}$, sensitive to the CKM angle $\gamma$, are measured to be \begin{eqnarray*} x_- &=& -0.15 \pm 0.14 \pm 0.03 \pm 0.01, \\y_- &=& 0.25 \pm 0.15 \pm 0.06 \pm 0.01, \\x_+ &=& 0.05 \pm 0.24 \pm 0.04 \pm 0.01, \\y_+ &=& -0.65^{+0.24}_{-0.23} \pm 0.08 \pm 0.01, \end{eqnarray*} where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the $D\rightarrow K^0_S \pi^+\pi^-$ amplitude model. [...]
arXiv:1605.01082; CERN-EP-2016-089; LHCB-PAPER-2016-007; LHCB-PAPER-2016-007; CERN-EP-2016-089.-
Geneva : CERN, 2016-08-24 - 32 p.
- Published in : JHEP 08 (2016) 137
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Figures, tables and other information
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Model-independent evidence for $J/\psi p$ contributions to $\Lambda_b^0\to J/\psi p K^-$ decays
/ LHCb collaboration
The data sample of $\Lambda_b^0\to J/\psi p K^-$ decays acquired with the LHCb detector from 7 and 8~TeV $pp$ collisions, corresponding to an integrated luminosity of 3 fb$^{-1}$, is inspected for the presence of $J/\psi p$ or $J/\psi K^-$ contributions with minimal assumptions about $K^- p$ contributions. It is demonstrated at more than 9 standard deviations that $\Lambda_b^0\to J/\psi p K^-$ decays cannot be described with $K^- p$ contributions alone, and that $J/\psi p$ contributions play a dominant role in this incompatibility. [...]
arXiv:1604.05708; LHCB-PAPER-2016-009; CERN-EP-2016-086; LHCB-PAPER-2016-009; CERN-EP-2016-086.-
Geneva : CERN, 2016-08-18 - 9 p.
- Published in : Phys. Rev. Lett. 117 (2016) 082002
APS Open Access article: PDF; Fulltext: 10.1103_PhysRevLett.117.082002 - PDF; arXiv:1604.05708 - PDF; Related data file(s): ZIP; Related supplementary data file(s): ZIP; External link: Preprint
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Measurement of the properties of the $\Xi_b^{*0}$ baryon
/ LHCb Collaboration
We perform a search for near-threshold $\Xi_b^0$ resonances decaying to $\Xi_b^- \pi^+$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by the LHCb experiment. We observe one resonant state, with the following properties: \begin{eqnarray*} m(\Xi_b^{*0}) - m(\Xi_b^-) - m(\pi^+) &=& 15.727 \pm 0.068 \, (\mathrm{stat}) \pm 0.023 \, (\mathrm{syst}) \, \mathrm{MeV}/c^2, \\ \Gamma(\Xi_b^{*0}) &=& 0.90 \pm 0.16 \, (\mathrm{stat}) \pm 0.08 \, (\mathrm{syst}) \, \mathrm{MeV} [...]
arXiv:1604.03896; LHCB-PAPER-2016-010; CERN-EP-2016-082; LHCB-PAPER-2016-010; CERN-EP-2016-082.-
Geneva : CERN, 2016-05-27 - 20 p.
- Published in : JHEP 05 (2016) 161
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Figures, tables and other information
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