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Observation of the suppressed Lambda 0 b rightarrow DpK - decay with D rightarrow K + pi - and measurement of its CP asymmetry
Physical Review D - Particles, Fields, Gravitation and Cosmology. 2021. Vol. 104. No. 11. Article 112008.
Aaij R., Abdelmotteleb A. S., Abellán Beteta C., Abudinen Gallego F. J., Ackernley T., Boldyrev A., Derkach D., Hushchyn M., Karpov M., Maevskiy A., Mokhnenko S., Ratnikov F., Ryzhikov A., Ustyuzhanin A.
A study of baryon decays to the Dp\Km final state is presented based on a proton-proton collision data sample corresponding to an integrated luminosity of 9\invfb collected with the LHCb detector. Two decays are considered, \Lb→D\proton\Km with D→\Km\pip and D→\Kp\pim, where D represents a superposition of and states. The latter process is expected to be suppressed relative to the former, and is observed for the first time. The ratio of branching fractions of the two decays is measured, and the asymmetry of the suppressed mode, which is sensitive to the CKM angle γ, is also reported.
Publication based on the results of:
Ahdida C., Ratnikov F., Ustyuzhanin A. et al., The European Physical Journal C - Particles and Fields 2021 Vol. 81 Article 451
Dark photons are hypothetical massive vector particles that could mix with ordinary photons. The simplest theoretical model is fully characterised by only two parameters: the mass of the dark photon mγD and its mixing parameter with the photon, ε. The sensitivity of the SHiP detector is reviewed for dark photons in the mass range between 0.002 ...
Added: October 14, 2021
The LHCb c., Ratnikov F., Ustyuzhanin A. et al., Journal of High Energy Physics 2020 Vol. 06 Article 136
A new baryon state is observed in the Λ0bπ+π− mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies s√=7,8 and 13TeV, corresponding to an integrated luminosity of 9fb−1. The mass and natural width of the new state are measured to be
m=6072.3±2.9±0.6±0.2MeV,Γ=72±11±2MeV,
where the first uncertainty is statistical and the second systematic. ...
Added: September 16, 2020
The LHCb c., Ratnikov F., Ustyuzhanin A. et al., Journal of High Energy Physics 2020 Vol. 07 Article 123
A precision measurement of the 𝐵+𝑐Bc+ meson mass is performed using proton- proton collision data collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to a total integrated luminosity of 9.0 fb−1. The 𝐵+𝑐Bc+ mesons are reconstructed via the decays 𝐵+𝑐Bc+→ J/ψπ+, 𝐵+𝑐Bc+→ J/ψπ+π−π+, 𝐵+𝑐→𝐽/𝜓𝑝𝑝⎯⎯⎯𝜋+Bc+→J/ψpp¯π+, 𝐵+𝑐→𝐽/𝜓𝐷+𝑠Bc+→J/ψDs+, 𝐵+𝑐Bc+→ J/ψ D0K+ and 𝐵+𝑐→𝐵0𝑠𝜋+Bc+→Bs0π+. Combining the results of the individual decay channels, the 𝐵+𝑐Bc+ mass is ...
Added: September 16, 2020
Pakhlov P., Popov V., Journal of High Energy Physics 2021 Vol. 2021 Article 92
Nowadays High Energy Physics experiments can accumulate unprecedented statistics of heavy flavour decays that allows to apply new methods, based on the study of very rare phenomena, which used to be just desperate. In this paper we propose a new method to measure composition of K0-anti-K0, produced in a decay of heavy hadrons. This composition ...
Added: October 13, 2021
Ahdida C., Albanese R., Alexandrov A. et al., Journal of Instrumentation 2020 Vol. 15 Article P01027
The Search for Hidden Particles (SHiP) experiment proposal at CERN demands a dedicated dipole magnet for its scattering and neutrino detector. This requires a very large volume to be uniformly magnetized at B>1.2 T, with constraints regarding the inner instrumented volume as well as the external region, where no massive structures are allowed and only an ...
Added: October 14, 2021
Mokhnenko S., Ratnikov F., Kazeev N. et al., proceedings of science, sissa, italy 2022 Vol. ICHEP2022 P. 233
During Run 2 of the Large Hadron Collider at CERN, the LHCb experiment has spent more than 80% of the pledged CPU time to produce simulated data samples. The upgraded LHCb detector, being commissioned now, will be able to collect much larger data samples, requiring many more simulated events to analyze the collected data. Simulation ...
Added: December 17, 2022
The LHCb c., Boldyrev A., Derkach D. et al., Journal of High Energy Physics 2020 Vol. 10 Article 156
Searches are performed for a low-mass dimuon resonance, X, produced in proton-proton collisions at a center-of-mass energy of 13 TeV, using a data sample corresponding to an integrated luminosity of 5.1 fb−1−1 and collected with the LHCb detector. The X bosons can either decay promptly or displaced from the proton-proton collision, where in both cases the ...
Added: December 6, 2020
Aaij R., Arzymatov K., Belavin V. et al., Journal of High Energy Physics 2021 Vol. 5 Article 95
The Cabibbo-suppressed decay Λ0b → χc1pπ− is observed for the first time us- ing data from proton-proton collisions corresponding to an integrated luminosity of 6 fb−1, collected with the LHCb detector at a centre-of-mass energy of 13 TeV. Evidence for the Λ0b → χc2pπ− decay is also found. Using the Λ0b → χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to be... where the first uncertainty is statistical, ...
Added: August 28, 2021
Ahdida C., Ratnikov F., Ustyuzhanin A. et al., The European Physical Journal C - Particles and Fields 2020 Vol. 80 Article 284
The SHiP experiment is proposed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. About 10^11 muons per spill will be produced in the dump. To design the experiment such that the muon-induced background is minimized, a precise knowledge of the ...
Added: October 14, 2021
Aaij R., Beteta C. A., Ratnikov F. et al., Physical Review Letters 2020 Vol. 124 P. 211802
A search for the decays B0s→e+e−Bs0→e+e− and B0→e+e−B0→e+e− is performed using data collected with the LHCb experiment in proton-proton collisions at center-of-mass energies of 77, 88 and 13TeV13TeV, corresponding to integrated luminosities of 11, 22 and 2fb−12fb−1, respectively. No signal is observed. Assuming no contribution from B0→e+e−B0→e+e− decays, an upper limit of (B0s→e+e−)<9.4(11.2)×10−9B(Bs0→e+e−)<9.4(11.2)×10−9 is obtained at 90(95)%90(95)% confidence level. If no B0s→e+e−Bs0→e+e− contribution is assumed, a limit of (B0→e+e−)<2.5(3.0)×10−9B(B0→e+e−)<2.5(3.0)×10−9 is determined at 90(95)%90(95)% confidence level. These upper limits are ...
Added: September 16, 2020
Aaij R., Beteta C. A., Ratnikov F. et al., Physical Review Letters 2020 Vol. 125 P. 011802
An angular analysis of the B0→K∗0(→K+π−)μ+μ− decay is presented using a data set corresponding to an integrated luminosity of 4.7 fb−1 of pp collision data collected with the LHCb experiment. The full set of CP-averaged observables are determined in bins of the invariant mass squared of the dimuon system. Contamination from decays with the K+π− system in an S-wave configuration is taken into ...
Added: September 16, 2020
Aaij R., Beteta C. A., Arzymatov K. et al., Physical Review Letters 2021 Vol. 127 No. 8 Article 082001
The first observation of exotic states with a new quark content cc ̄us ̄ decaying to the J=ψKþ final state is reported with high significance from an amplitude analysis of the Bþ → J=ψφKþ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb−1 collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The most significant state, Z ð4000Þþ, ...
Added: August 28, 2021
Aaij R., Beteta C. A., Arzymatov K. et al., Journal of High Energy Physics 2020 Vol. 6 P. 58
Measurements of CP observables in B±→DK± and B±→Dπ± decays are presented, where D represents a superposition of D0 and D¯0 states. The D meson is reconstructed in the three-body final state K0SK±π∓. The analysis uses samples of B mesons produced in proton-proton collisions, corresponding to an integrated luminosity of 1.0, 2.0, and 6.0 fb−1 collected with the LHCb detector at centre-of-mass energies of s√= 7, 8, and 13 TeV, respectively. These measurements are the most ...
Added: September 16, 2020
Aaij R., Arzymatov K., Belavin V. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2020 Vol. 102 No. 5 Article 051102(R)
The first observation of the decay B0→D0¯D0K+π− is reported using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 collected by the LHCb experiment in 2011, 2012 and 2016. The measurement is performed in the full kinematically allowed range of the decay outside of the D*− region. The ratio of the branching fraction relative to that of the control channel B0→D*−D0K+ is ...
Added: December 6, 2020
Aaij R., Arzymatov K., Belavin V. et al., Physical Review Letters 2021 Vol. 126 No. 16 Article 161802
We present an angular analysis of the Bþ → Kþð→ K0SπþÞμþμ− decay using 9 fb−1 of pp collision data collected with the LHCb experiment. For the first time, the full set of CP-averaged angular observables is measured in intervals of the dimuon invariant mass squared. Local deviations from standard model predictions are observed, similar to those in previous LHCb analyses of the isospin-partner B0 → K0μþμ− decay. The global tension ...
Added: August 28, 2021
Aaij R., Ratnikov F., Ustyuzhanin A. et al., Physical Review Letters 2020 Vol. 124 No. 22 Article 222001
The Λ+cK− mass spectrum is studied with a data sample of pp collisions at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb−1 collected by the LHCb experiment. Three Ξ0c states are observed with a large significance and their masses and natural widths are measured to be
m(Ξc(2923)0)=2923.04±0.25±0.20±0.14 MeV,Γ(Ξc(2923)0)=7.1±0.8±1.8 MeV,
m(Ξc(2939)0)=2938.55±0.21±0.17±0.14 MeV,Γ(Ξc(2939)0)=10.2±0.8±1.1 MeV,
m(Ξc(2965)0)=2964.88±0.26±0.14±0.14 MeV,Γ(Ξc(2965)0)=14.1±0.9±1.3 MeV,
where the uncertainties are statistical, systematic, and due to the limited ...
Added: September 16, 2020
Ratnikov F., Journal of High Energy Physics 2021 No. 199 P. 1-32
Dark matter is a well-established theoretical addition to the Standard Model supported by many observations in modern astrophysics and cosmology. In this context, the existence of weakly interacting massive particles represents an appealing solution to the observed thermal relic in the Universe. Indeed, a large experimental campaign is ongoing for the detection of such particles ...
Added: October 14, 2021
Katushkina O. A., Quemerais E., Izmodenov V.V. et al., JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2017 Vol. 122 No. 11 P. 10921-10937
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Added: January 26, 2018
Aaij R., Abdelmotteleb A. S., Abellan Beteta C. et al., The European Physical Journal C - Particles and Fields 2023 Vol. 83 Article 543
https://link.springer.com/article/10.1140/epjc/s10052-023-11673-x#Abs1 ...
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Ружицкая Д. Д., САМОЙЛЕНКО А. А., Иванов А. Д. et al., Optoelectronics, Instrumentation and Data Processing 2017 Vol. 54 No. 1 P. 1-8
This paper presents an algorithm for processing the transmission spectra of whisperinggallery optical microcavities for use as a nanoparticle detector. The algorithm is based on the broadening of the microcavity resonance curve during precipitation of nanoparticles on the microcavity surface. Experimental results on the detection of particles are compared with Langmuir adsorption theory. The contribution ...
Added: May 25, 2018
М. : National Instruments Russia, 2017
Содержание сборника составляют доклады с результатами оригинальных исследований и технических решений, ранее не публиковавшиеся. Мы надеемся, что предлагаемый сборник окажется полезным для специалистов, работающих в различных областях науки и техники, для широкого круга преподавателей, аспирантов и студентов ВУЗов, а также для преподавателей средних школ и технических колледжей. ...
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Min Namkung, Younghun K., Scientific Reports 2018 Vol. 8 No. 1 P. 16915-1-16915-18
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Загорский Д. Л., Долуденко И. М., Каневский В. М. et al., Известия РАН. Серия физическая 2021 Т. 85 № 8 С. 1088-1094
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Panina I., Balandin S., Tsarev A. et al., International Journal of Molecular Sciences 2023 Vol. 24 No. 2 P. 1
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Added: February 21, 2023