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1.
Measurement of time-dependent CP violation in B 0 → η′K 0 decays
Luka Šantelj, Marko Bračko, Boštjan Golob, Samo Korpar, Peter Križan, Tara Nanut, Rok Pestotnik, Marko Petrič, Eva Ribežl, Marko Starič, Anže Zupanc, 2014, original scientific article

Abstract: We present a measurement of the time-dependent CP violation parameters in B0 → η′K0 decays. The measurement is based on the full data sample containing 772 × 10^6 BB pairs collected at the Υ(4S) resonance using the Belle detector at the KEKB asymmetric-energy e+e− collider. The measured values of the mixing-induced and direct CP violation parameters are: sin⁡ 2ϕ1eff=+0.68±0.07±0.03, Aη′K0=+0.03±0.05±0.04, where the first uncertainty is statistical and the second is systematic. The values obtained are the most accurate to date. Furthermore, these results are consistent with our previous measurements and with the world-average value of sin 2ϕ1 measured in B0 → J/ψK0 decays.
Keywords: CP violation, CKM angle beta, e+-e- Experiments, B physics
Published: 27.06.2017; Views: 394; Downloads: 213
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2.
Search for B decays to final states with the η c meson
A. Vinokurova, Marko Bračko, Boštjan Golob, Samo Korpar, Peter Križan, Rok Pestotnik, Marko Petrič, Eva Ribežl, Samo Stanič, Marko Starič, Luka Šantelj, Anže Zupanc, 2015, original scientific article

Abstract: We report a search for B decays to selected final states with the ηc meson: B± → K±ηcπ+π−, B± → K±ηcω, B± → K±ηcη and B± → K±ηcπ0. The analysis is based on 772 × 10^6 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We set 90% confidence level upper limits on the branching fractions of the studied B decay modes, independent of intermediate resonances, in the range (0.6–5.3)×10^−4. We also search for molecular-state candidates in the D^0 ¯D^∗0 − ¯D^0D^∗0, D^0 ¯D^0 + ¯D^0D^0 and D^∗0¯D^∗0 + ¯D^∗0D^∗0 combinations, neutral partners of the Z(3900)± and Z(4020)±, and a poorly understood state X(3915) as possible intermediate states in the decay chain, and set 90% confidence level upper limits on the product of branching fractions to the mentioned intermediate states and decay branching fractions of these states in the range (0.6–6.9)×10^−5.
Keywords: exotics, quarkonium, e+-e- experiments, B physics, particle and resonance production
Published: 27.06.2017; Views: 413; Downloads: 242
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3.
Measurement of D0–D‾0 mixing and search for CP violation in D0 → K+K−,π+π− decays with the full Belle data set
Marko Starič, Jyoti Prakash Biswal, Marko Bračko, Boštjan Golob, Samo Korpar, Peter Križan, Tara Nanut, Rok Pestotnik, Marko Petrič, Eva Ribežl, Samo Stanič, Anže Zupanc, 2016, original scientific article

Abstract: We report an improved measurement of $D^0–{\overline{D}}^0$ mixing and a search for $CP$ violation in $D^0$ decays to $CP$ -even final states $K^+K^−$ and $\pi^+\pi^-$. The measurement is based on the final Belle data sample of $976 fb^{−1}$. The results are $y_CP=(1.11±0.22±0.09)%$ and $A_Γ=(−0.03±0.20±0.07)%$, where the first uncertainty is statistical and the second is systematic.
Keywords: charm mesons, mixing, CP violation
Published: 17.07.2017; Views: 343; Downloads: 203
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4.
First model-independent Dalitz analysis of $B^0 \to D^0K^{\ast 0}$, $D\to K_S^0\pi ^+\pi ^-$ decay
K. Negishi, Jyoti Prakash Biswal, Marko Bračko, Boštjan Golob, Samo Korpar, Peter Križan, Tara Nanut, Rok Pestotnik, Marko Petrič, Eva Ribežl, Samo Stanič, Marko Starič, Luka Šantelj, Anže Zupanc, 2016, original scientific article

Abstract: We report a measurement of the amplitude ratio $r_S$ of $B^0 \to D^0K^{\ast 0}$ and $B^0 \to \bar {D^0}K^{\ast 0}$ decays with a Dalitz analysis of $D\to K_S^0\pi ^+\pi ^-$ decays, for the first time using a model-independent method. We set an upper limit $r_S < 0.87$ at the 68% confidence level, using the full data sample of $711\,{\rm fb}^{-1}$ corresponding to $772\times 10^6$ $B\bar {B}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. This result is obtained from observables $x_- = +0.4 ^{+1.0 +0.0}_{-0.6 -0.1} \pm 0.0$, $y_- = -0.6 ^{+0.8 +0.1}_{-1.0 -0.0} \pm 0.1$, $x_+ = +0.1 ^{+0.7 +0.0}_{-0.4 -0.1} \pm 0.1$, and $y_+ = +0.3 ^{+0.5 +0.0}_{-0.8 -0.1} \pm 0.1$, where $x_\pm = r_S \cos (\delta _S \pm \phi _3)$, $y_\pm = r_S \sin (\delta _S \pm \phi _3)$, and $\phi _3\ (\delta _S)$ is the weak (strong) phase difference between $B^0 \to D^0K^{\ast 0}$ and $B^0 \to \bar {D^0}K^{\ast 0}$.
Keywords: CO2, CO3, Cabibbo-Kobayashi-Maskawa quark-mixing matrix, CP violation, experimental particle physics
Published: 21.07.2017; Views: 370; Downloads: 65
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5.
Nasilje psihiatričnih bolnikov in vloga policije v Republiki Sloveniji
Kaja Ribežl, 2018, undergraduate thesis

Abstract: Duševno zdravje v Republiki Sloveniji od leta 2008 ureja Zakon o duševnem zdravju. Na podlagi drugega odstavka tega člena pa je ministrstvo izdalo tudi Pravilnik o načinu sodelovanja med zdravstvenim osebjem in reševalno službo ter policijo, ki velja od leta 2009. Pred tem sta to področje urejala Zakon o zdravstveni dejavnosti in Zakon o nepravdnem postopku. Duševna motnja je bolezen, ki lahko prizadene vsakega posameznika na različne načine in v kateremkoli življenjskem obdobju. Tem so skupne motnje bioloških in psiholoških funkcij, ki prizadenejo mišljenje, zaznavanje, čustvovanje, vedenje, spomin in prepoznavanje. Kadar je bolnik duševno bolan, lahko izgubi stik z realnostjo in občutek za razumevanje svojih dejanj. Zaradi vpliva duševne motnje pa lahko bolnik hkrati postane nasilen do ljudi okoli sebe kot tudi do samega sebe. Policisti se z duševnimi bolniki srečujejo tako v psihiatričnih bolnišnicah kot tudi izven nje. Lahko so v pomoč zdravstveni službi ali pa se z bolniki soočijo v okviru intervencije. Prepričanje, da so duševno motene osebe bolj nasilne, ne drži popolnoma. Povišana nasilnost, ki je največkrat usmerjena proti samemu sebi, se navadno pojavi le v obdobju poslabšanja določene bolezni. Večjo nevarnost za druge predstavljajo ljudje, ki imajo osebnostne motnje. V diplomski nalogi smo pregledali zakonodajo, ki ureja področje duševnega zdravja. Pregledali smo tudi literaturo, ki opisuje postopke načina reševanja, kadar se policist sooči z nasilnimi psihiatričnimi bolniki. Z anketnim vprašalnikom pa smo skušali ugotoviti, kako pogosto pride do soočanja policije z nasilnimi psihiatričnimi bolniki in njihovo usposobljenost za reševanje tega problema.
Keywords: psihiatrija, duševno zdravje, duševni bolniki, nasilje, neprostovoljna hospitalizacija, policija, policijska pooblastila, diplomske naloge
Published: 12.07.2018; Views: 494; Downloads: 90
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