RESONANCE PRODUCTION AND DECAY IN PROTON-PROTON COLLISIONS AT T = 1.25 GeV MEASURED WITH HADES SPECTROMETER

2014 ◽  
Vol 26 ◽  
pp. 1460105
Author(s):  
◽  
W. PRZYGODA
Keyword(s):  
Partial Wave Analysis ◽  
Resonance Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Baryonic Resonance ◽  
Boson Exchange ◽  
Resonance Cross Section ◽  
Reaction Channels ◽  
First Time ◽  
Proton Proton Collisions

In this paper we report on the investigation of baryonic resonance production in proton-proton collisions at kinetic energy 1.25 GeV measured with HADES. Exclusive channels ppe+e- and ppe+e-γ as well as ppπ0 and npπ+ were studied. The resonance cross section was determined from hadronic channels in the framework of a one boson exchange model with the accuracy of 15%. The dilepton analysis proved the resonance origin of e+e- pairs and the Δ Dalitz decay was identified experimentally (in the pe+e- channel) for the first time. Investigation of hadronic reaction channels by means of the Partial Wave Analysis revealed a dominant contribution of P33(1232) but also sizeable non-resonant terms and interference effects.

scholarly journals Pion production in proton-proton collisions in a covariant one-boson-exchange model

1996 ◽  
Vol 603 (3-4) ◽  
pp. 387-414 ◽  
Author(s):  
A. Engel ◽  
R. Shyam ◽  
U. Mosel ◽  
A.K. Dutt-Mazumder
Keyword(s):  
Pion Production ◽  
Exchange Model ◽  
Proton Proton ◽  
Proton Collisions ◽  
Boson Exchange ◽  
Proton Proton Collisions

scholarly journals Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

2014 ◽  
Vol 50 (5) ◽  
Author(s):  
G. Agakishiev ◽  
A. Balanda ◽  
D. Belver ◽  
A. Belyaev ◽  
J. C. Berger-Chen ◽  
...  
Keyword(s):  
Baryon Resonance ◽  
Resonance Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Proton Proton Collisions

η PRODUCTION IN PROTON-PROTON COLLISIONS AT 72 MeV EXCESS ENERGY

2009 ◽  
Vol 24 (02n03) ◽  
pp. 446-449
Author(s):  
◽  
H. PETTERSSON ◽  
M. BASHKANOV ◽  
D. BOGOSLOWSKY ◽  
H. CALÉN ◽  
...  
Keyword(s):  
Simple Model ◽  
Strong Influence ◽  
Excess Energy ◽  
Exchange Model ◽  
Final States ◽  
Proton Proton ◽  
Proton Collisions ◽  
Boson Exchange ◽  
Proton Proton Collisions ◽  
Better Than

The production of η mesons at an excess energy of 72 MeV has been studied in the reaction pp → pp(η)γγ. It is shown that a simple model with Pp final states included reproduces observed differential distributions better than the same model restricted to Ss , Sd and Ds final states. The strong influence of the Pp states could be taken as an indication of ρ dominance within an one boson exchange model for the excitation of N *(1535).

scholarly journals Observation of the decay $$ {\Lambda}_{\mathrm{b}}^0 $$ → χc1pπ−

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
R. Aaij ◽  
◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
B. Adeva ◽  
...  
Keyword(s):  
Branching Fractions ◽  
Centre Of Mass ◽  
Mass Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
Lhcb Detector ◽  
Using Data ◽  
Cabibbo Suppressed ◽  
First Time ◽  
Proton Proton Collisions

Abstract The Cabibbo-suppressed decay $$ {\Lambda}_{\mathrm{b}}^0 $$ Λ b 0 → χc1pπ− is observed for the first time using 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 $$ {\Lambda}_{\mathrm{b}}^0 $$ Λ b 0 → χc2pπ− decay is also found. Using the $$ {\Lambda}_{\mathrm{b}}^0 $$ Λ b 0 → χc1pK− decay as normalisation channel, the ratios of branching fractions are measured to be$$ {\displaystyle \begin{array}{c}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=\left(6.59\pm 1.01\pm 0.22\right)\times {10}^{-2},\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\uppi}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\uppi}^{-}\right)}=0.95\pm 0.30\pm 0.04\pm 0.04,\\ {}\frac{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}2}{\mathrm{p}\mathrm{K}}^{-}\right)}{\mathcal{B}\left({\Lambda}_{\mathrm{b}}^0\to {\upchi}_{\mathrm{c}1}{\mathrm{p}\mathrm{K}}^{-}\right)}=1.06\pm 0.05\pm 0.04\pm 0.04,\end{array}} $$ B Λ b 0 → χ c 1 pπ − B Λ b 0 → χ c 1 pK − = 6.59 ± 1.01 ± 0.22 × 10 − 2 , B Λ b 0 → χ c 2 pπ − B Λ b 0 → χ c 1 pπ − = 0.95 ± 0.30 ± 0.04 ± 0.04 , B Λ b 0 → χ c 2 pK − B Λ b 0 → χ c 1 pK − = 1.06 ± 0.05 ± 0.04 ± 0.04 , where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of χc1,2→ J/ψγ decays.

Momentum transfer dependence of nucleon resonance production in proton-proton collisions at 24 GeV/c

1971 ◽  
Vol 34 (5) ◽  
pp. 435-438 ◽  
Author(s):  
U. Amaldi ◽  
R. Biancastelli ◽  
C. Bosio ◽  
G. Matthiae ◽  
J.V. Allaby ◽  
...  
Keyword(s):  
Momentum Transfer ◽  
Nucleon Resonance ◽  
Resonance Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Momentum Transfer Dependence ◽  
Proton Proton Collisions

scholarly journals Study of $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ → J/ψπ+π−K+K− decays

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
R. Aaij ◽  
◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
B. Adeva ◽  
...  
Keyword(s):  
Branching Fractions ◽  
Centre Of Mass ◽  
Single Measurement ◽  
Data Set ◽  
Proton Proton ◽  
Proton Collisions ◽  
A Value ◽  
Lhcb Detector ◽  
First Time ◽  
Proton Proton Collisions

Abstract The decays $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → J/ψπ+π−K+K− are studied using a data set corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → $$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$ J / ψK ∗ 0 K ¯ ∗ 0 and $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → χc1(3872)K+K−, where the K+K−pair does not originate from a ϕ meson, are observed for the first time. Precise measurements of the ratios of branching fractions between intermediate χc1(3872)ϕ, $$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$ J / ψK ∗ 0 K ¯ ∗ 0 , ψ(2S)ϕ and χc1(3872)K+K− states are reported. A structure, denoted as X(4740), is observed in the J/ψϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be$$ {\displaystyle \begin{array}{c}{m}_{\mathrm{X}(4740)}=4741\pm 6\pm 6\kern0.5em \mathrm{MeV}/{c}^2,\\ {}{\Gamma}_{\mathrm{X}(4740)}=53\pm 15\pm 11\kern0.5em \mathrm{MeV},\end{array}} $$ m X 4740 = 4741 ± 6 ± 6 MeV / c 2 , Γ X 4740 = 53 ± 15 ± 11 MeV , where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 meson is performed and gives a value of$$ {m}_{{\mathrm{B}}_{\mathrm{s}}^0}=5366.98\pm 0.07\pm 0.13\kern0.5em \mathrm{MeV}/{c}^2. $$ m B s 0 = 5366.98 ± 0.07 ± 0.13 MeV / c 2 .

LEADING MODES OF 3π0 PRODUCTION IN PROTON-PROTON COLLISIONS AT INCIDENT PROTON MOMENTUM 3.35 GeV/c

2011 ◽  
Vol 26 (03n04) ◽  
pp. 654-655
Author(s):  
◽  
BENEDYKT R. JANY
Keyword(s):  
Cross Section ◽  
Dalitz Plot ◽  
Proton Momentum ◽  
Incident Proton ◽  
Proton Proton ◽  
Proton Collisions ◽  
Simultaneous Excitation ◽  
First Time ◽  
Proton Proton Collisions ◽  
Baryon Resonances

For the first time pp → pp3π0 has been measured at an incident proton momentum of Pb = 3.35 GeV / c . The total cross section has been determined. The reaction mechanism is studied by a Dalitz plot analyses, which indicate that the leading production and decay mechanism is closely related to the simultaneous excitation of Δ(1232) and N*(1440) baryon resonances.

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