Calibration of the CMS hadron calorimeters using proton-proton collision data at root s=13 TeV

Methods are presented for calibrating the hadron calorimeter system of theCMSetector at the LHC. The hadron calorimeters of the CMS experiment are sampling calorimeters of brass and scintillator, and are in the form of one central detector and two endcaps. These calorimeters cover pseudorapidities vertical bar eta vertical bar ee data. The energy scale of the outer calorimeters has been determined with test beam data and is confirmed through data with high transverse momentum jets. In this paper, we present the details of the calibration methods and accuracy.Peer reviewe

Study of rotational bands in 136 Pr by gamma spectroscopy line method.

Utilizando tecnicas de espectroscopia-GAMA em linha e reacoes do tipo (hi, xnypGAMA) que populam estados de alto spin estudou-se a estrutura do nucleo duplamente impar ANTPOT.136 PR atraves das reacoes ANTPOT.123 SB (ANTPOT.16 O, 3n)ANTPOT.136 PR e ANTPOT.126 TE (ANTPOT.14 N 4n)ANTPOT.136 PR. Foram realizadas medidas de funcoes de excitacao em quatro energias, e coincidencias GAMA-GAMA-t e distribuicoes angulares em 69mev e 56mev, respectivamente, utilizando detetores hpge de alta resolucao (2kev) e alvos de isotopos enriquecidos de ANTPOT.123 SB (99%) e ANTPOT.126 TE (94%) com espessuras de aproximadamente 9mg/CENTIMETROS QUADRADOS. O esquema de niveis de energia do ANTPOT.136 PR evidencia duas bandas rotacionais que populam um estado isomerico com meia-vida de 92ns. A banda yrast e caracterizada por um staggering em seus niveis de energia, com transicoes m1 intensas e e2 fracas baseada na configuracao PI (h ind.11/2) IND.1/2 TETA NI (h ind.11/2) IND.9/2, de acordo com a sistematica da regiao de massa a=130, mostrando um pequeno energy splitting de 40kev. Na banda secundaria pressupoe-se a configuracao PI (d ind.5/2) IND.3/2 TETA NI (h ind.11/2) IND.11/2. Os resultados experimentais foram interpretados com base no cranked shell model que predizem deformacoes GAMA pequenas e negativas na regiao dos LA e PRThe structure of the doubly odd nucleus 136pr has been studied using techniques of on-line -spectroscopy with the reactions 123Sb (16O,3n) 136 Pr and 126Te(14 N,4n)136 Pr populating high spin states. The excitation functions were measured at four energies, and - t coincidences and angular distributions at 69MeV and 56MeV , respectively, using high resolution HPGe detectors (2keV) and targets of enriched isotopes of 123 Sb (99%) and 126Te (94%) with thicknesses of approximately 9mg/cm². The energy level scheme of 136Pr shows two rotational bands which populate one isomeric state with a half-life of 92s. The Yrast band is characterized by the staggering in energy levels with intense M1 transitions and weak E2 transitions, based on a configuration (h11/2)1/2 v(h11/2)9/2 in agreemment with the sistematics of the mass region A = 130. There is a small energy splitting of 40keV. For the secondary band a configuration n(d5/2)3/2 (h11/2)11/2 is possible. Experimental results were interpreted within the framework of the Cranked Shell Model which predicts small negative deformations in the La and Pr region

Study of rotational bands in 136 Pr by gamma spectroscopy line method.

Utilizando tecnicas de espectroscopia-GAMA em linha e reacoes do tipo (hi, xnypGAMA) que populam estados de alto spin estudou-se a estrutura do nucleo duplamente impar ANTPOT.136 PR atraves das reacoes ANTPOT.123 SB (ANTPOT.16 O, 3n)ANTPOT.136 PR e ANTPOT.126 TE (ANTPOT.14 N 4n)ANTPOT.136 PR. Foram realizadas medidas de funcoes de excitacao em quatro energias, e coincidencias GAMA-GAMA-t e distribuicoes angulares em 69mev e 56mev, respectivamente, utilizando detetores hpge de alta resolucao (2kev) e alvos de isotopos enriquecidos de ANTPOT.123 SB (99%) e ANTPOT.126 TE (94%) com espessuras de aproximadamente 9mg/CENTIMETROS QUADRADOS. O esquema de niveis de energia do ANTPOT.136 PR evidencia duas bandas rotacionais que populam um estado isomerico com meia-vida de 92ns. A banda yrast e caracterizada por um staggering em seus niveis de energia, com transicoes m1 intensas e e2 fracas baseada na configuracao PI (h ind.11/2) IND.1/2 TETA NI (h ind.11/2) IND.9/2, de acordo com a sistematica da regiao de massa a=130, mostrando um pequeno energy splitting de 40kev. Na banda secundaria pressupoe-se a configuracao PI (d ind.5/2) IND.3/2 TETA NI (h ind.11/2) IND.11/2. Os resultados experimentais foram interpretados com base no cranked shell model que predizem deformacoes GAMA pequenas e negativas na regiao dos LA e PRThe structure of the doubly odd nucleus 136pr has been studied using techniques of on-line -spectroscopy with the reactions 123Sb (16O,3n) 136 Pr and 126Te(14 N,4n)136 Pr populating high spin states. The excitation functions were measured at four energies, and - t coincidences and angular distributions at 69MeV and 56MeV , respectively, using high resolution HPGe detectors (2keV) and targets of enriched isotopes of 123 Sb (99%) and 126Te (94%) with thicknesses of approximately 9mg/cm². The energy level scheme of 136Pr shows two rotational bands which populate one isomeric state with a half-life of 92s. The Yrast band is characterized by the staggering in energy levels with intense M1 transitions and weak E2 transitions, based on a configuration (h11/2)1/2 v(h11/2)9/2 in agreemment with the sistematics of the mass region A = 130. There is a small energy splitting of 40keV. For the secondary band a configuration n(d5/2)3/2 (h11/2)11/2 is possible. Experimental results were interpreted within the framework of the Cranked Shell Model which predicts small negative deformations in the La and Pr region

Medium lives in 132,133Ce and 136Pr

Vidas médias de níveis mais baixos nas bandas de 1 e 3 quase-partículas em ANTPOT 133Ce foram medidas usando a técnica de distância de recuo e deslocamento Doppler RDDS. As amplitudes das transições E2 extraídas dos estados yrast de paridade negativa são bem descritas pelos modelos Rotor Triaxial + Quase-Partícula e geométrico. Os valores de B(M1) extraídos para os níveis na banda de 3 quase-partículas de paridade positiva estão consistentes com a atribuição da configuração Vh1l/2 (X) h 1l/2 (X) g7/2 para essa banda. Os níveis no 132,133Ce foram populados pela reação ANTPOT 120 Sn (ANTPOT 16 O,4n,3n) ANTPOT 132,133Ce na energia incidente de 70 MeV. O feixe foi fornecido pelo acelerador Tandem do Laboratório Pelletron. Os dados foram obtidos usando um detetor HP Ge (22% de eficiência, resolução de energia de 2.1keV) com supressão Compton BGO a 0° em relação ao feixe e um filtro de multiplicidades de 6 detetores 3\" x 3\" de NaI(Tl) num plano perpendicular ao plano da reação. O alvo foi produzido por evaporação ed ANTPOT 120 Sn metálico sobre um substrato fino de ouro voltado na direção de incidência do feixe, enquanto que o anteparo (stopper) foi produzido em chumbo. Os núcleos de recuo atingiram uma velocidade média de v= 0.008c. As medidas foram realizadas com um dispositivo plunger construído no Laboratório Pelletron. Os espectros foram obtidos para 13 diferentes distâncias alvo-stopper e foram normalizadas usando uma linha gama de 279 keV da excitação Coulombiana do substrato de Au. As distâncias de vôo alvo-stopper foram medidas usando a técnica de capacitância e também com um micrômetro de precisão. As vidas médias de estados de alto spin em ANTPOT 136 Pr, ímpar-ímpar, foram também medidas usando a reação ANTPOT. 123 Sb (ANTPOT 16 O,3n) na energia incidente de 65 MeV. Os espectros de raios gama foram adquirídos para 20 diferentes distâncias. O alvo foi confeccionado de ANTPOT 123 Sb de espessura de 1mg/cm², evaporado sobre um substrato de 2mg/cm² de Au. A análise mostra que a vida média do estado 8+ da banda yrast (h1l/2) (X) v(h 1l / 2) é de 1177 ± 64ps. Um limite superior para a vida média do estado 7- foi estabelecido em < 1ns.Lifetimes of the low-lying levels in the one and three quasiparticle bands in 133Ce have been measured using the recoil-distance Doppler-shift technique RDDS. The E2 transition strengths extracted for the negative parity yrast states are well described by the Triaxial-Rotor-plus-Quasipartide and the geometrical model. The B(M1) values extracted for the levels in the positive parity 3 quasipartide band are consistent with the Vh11/2 X h 11/2 g7/2 configuration assignment to this band. Levels in 132,133Ce were populated by the 120Sn(16O,4n,3n)132,133Ce reaction at an incident energy of 70 MeV. The beam was provided by the Tandem accelerator of the Pelletron Laboratory. Data were obtained using a BGO Compton suppressed HPGe detector (22% efficiency, energy resolution 2.1 keV) at 0° to the beam and a multiplicity filter of six 3\" x 3\" NaI(TI) detectors in a plane perpendicular to the reaction plane. The target was produced by evaporation of enriched metallic 120Sn onto a thin Au backing which faced the incident beam, while the stopper was of lead. The recoil nuclei had an average velocity of v = 0.008c. The measurements were performed with a plunger device constructed in our laboratory. Spectra were obtained for 13 different target-stopper distances and were normalized using the 279 keV gamma line from the Coulomb excitation of the Au backing. The target-stopper flight distances were measured using the capacitance technique and also with a precision micrometer. Lifetimes of the high spin states in odd-odd 136Pr were also measured using the 123Sb(16O,3n) reaction at an incident energy of 65 MeV. Gamma spectra were collected at about 20 different distances. The target was of enriched 123Sb 1mg/cm2 thick, evaporated onto a Au 2mg/cm2 backing. Analysis shows that the lifetime of the 8+ state in the yrast band (h11 2Z) X V (h11/2) is 1177 ± 64ps. An upper limit for the 7- state was stablished in < 1ns

Measurement of the double-differential inclusive jet cross section in proton-proton collisions at s\sqrt{s} = 5.02 TeV

International audienceThe inclusive jet cross section is measured as a function of jet transverse momentum $p_\mathrm{T}$ and rapidity $y$. The measurement is performed using proton-proton collision data at $\sqrt{s}$ = 5.02 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 27.4 pb$^{-1}$. The jets are reconstructed with the anti-$k_\mathrm{T}$ algorithm using a distance parameter of $R$ = 0.4, within the rapidity interval $\lvert y\rvert$$\lt$ 2, and across the kinematic range 0.06 $\lt$$p_\mathrm{T}$$\lt$ 1 TeV. The jet cross section is unfolded from detector to particle level using the determined jet response and resolution. The results are compared to predictions of perturbative quantum chromodynamics, calculated at both next-to-leading order and next-to-next-to-leading order. The predictions are corrected for nonperturbative effects, and presented for a variety of parton distribution functions and choices of the renormalization/factorization scales and the strong coupling $\alpha_\mathrm{S}$

Two-particle Bose-Einstein correlations and their Lévy parameters in PbPb collisions at sNN\sqrt{s_\mathrm{NN}} = 5.02 TeV

Two-particle Bose-Einstein momentum correlation functions are studied for charged-hadron pairs in lead-lead collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV. The data sample, containing 4.27$\times10^{9}$ minimum bias events corresponding to an integrated luminosity of 0.607 nb$^{-1}$, was collected by the CMS experiment in 2018. The experimental results are discussed in terms of a L\'evy-type source distribution. The parameters of this distribution are extracted as functions of particle pair average transverse mass and collision centrality. These parameters include the L\'evy index or shape parameter ($\alpha$), the L\'evy scale parameter ($R$), and the correlation strength parameter ($\lambda$). The source shape, characterized by $\alpha$, is found to be neither Cauchy nor Gaussian, implying the need for a full L\'evy analysis. Similarly to what was previously found for systems characterized by Gaussian source radii, a hydrodynamical scaling is observed for the L\'evy $R$ parameter. The $\lambda$ parameter is studied in terms of the core-halo model.Comment: Submitted to Physical Review C. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-011 (CMS Public Pages

Measurement of the double-differential inclusive jet cross section in proton-proton collisions at s\sqrt{s} = 5.02 TeV

International audienceThe inclusive jet cross section is measured as a function of jet transverse momentum $p_\mathrm{T}$ and rapidity $y$. The measurement is performed using proton-proton collision data at $\sqrt{s}$ = 5.02 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 27.4 pb$^{-1}$. The jets are reconstructed with the anti-$k_\mathrm{T}$ algorithm using a distance parameter of $R$ = 0.4, within the rapidity interval $\lvert y\rvert$$\lt$ 2, and across the kinematic range 0.06 $\lt$$p_\mathrm{T}$$\lt$ 1 TeV. The jet cross section is unfolded from detector to particle level using the determined jet response and resolution. The results are compared to predictions of perturbative quantum chromodynamics, calculated at both next-to-leading order and next-to-next-to-leading order. The predictions are corrected for nonperturbative effects, and presented for a variety of parton distribution functions and choices of the renormalization/factorization scales and the strong coupling $\alpha_\mathrm{S}$

Measurement of the double-differential inclusive jet cross section in proton-proton collisions at s\sqrt{s} = 5.02 TeV

International audienceThe inclusive jet cross section is measured as a function of jet transverse momentum $p_\mathrm{T}$ and rapidity $y$. The measurement is performed using proton-proton collision data at $\sqrt{s}$ = 5.02 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 27.4 pb$^{-1}$. The jets are reconstructed with the anti-$k_\mathrm{T}$ algorithm using a distance parameter of $R$ = 0.4, within the rapidity interval $\lvert y\rvert$$\lt$ 2, and across the kinematic range 0.06 $\lt$$p_\mathrm{T}$$\lt$ 1 TeV. The jet cross section is unfolded from detector to particle level using the determined jet response and resolution. The results are compared to predictions of perturbative quantum chromodynamics, calculated at both next-to-leading order and next-to-next-to-leading order. The predictions are corrected for nonperturbative effects, and presented for a variety of parton distribution functions and choices of the renormalization/factorization scales and the strong coupling $\alpha_\mathrm{S}$