ترغب بنشر مسار تعليمي؟ اضغط هنا

Has a $ppK^{-}$ Signal in p+p Reactions been Observed Yet?

177   0   0.0 ( 0 )
 نشر من قبل Eliane Epple
 تاريخ النشر 2015
  مجال البحث
والبحث باللغة English




اسأل ChatGPT حول البحث

Our answer to the question posed in the title is: probably no. In this work we show that it is rather unlikely that the structure $X(2265)$ reported by the DISTO collaboration corresponds to a kaonic nuclear bound state. The main argumentation is based on the repetition of the DISTO analysis on the HADES data sample, containing p+p reactions at 3.5 GeV. We further discuss many aspects in connection with the $pK^{+}Lambda$ final state and the $Lambda(1405)$-resonance. The results evidence possible problematics in the interpretation of the DISTO data.



قيم البحث

اقرأ أيضاً

The experimental search for the location of the QCD critical point in the phase diagram is of primary importance. In a recent publication it is claimed that measurements at RHIC lead not only to the location of the critical point ($mu_{cep}=95$ MeV, $T_{cep}=165$ MeV) but also to the verification of its universality class ($3d$ Ising system) by extracting the values of the critical exponents ($gamma=1.2$, $ u=0.66$). We argue that this claim is based on an erroneous treatment of scaling relations near the critical point. As a result, the correct interpretation of the measurements cannot be linked to the QCD critical point.
We observed a distinct peak in the $Lambda p$ invariant mass spectrum of $^{3}{rm He}(K^-, , Lambda p)n$, well below the mass threshold of $m_K + 2 m_p$. By selecting a relatively large momentum-transfer region $q = 350 sim 650$ MeV/$c$, one can clea rly separate the peak from the quasi-free process, $overline{K}N rightarrow overline{K}N$ followed by the non-resonant absorption by the two spectator-nucleons $overline{K}NN rightarrow Lambda N $. We found that the simplest fit to the observed peak gives us a Breit-Wigner pole position at $B_{rm {it Kpp}} = 47 pm 3 , (stat.) ,^{+3}_{-6} ,(sys.)$ MeV having a width $Gamma_{rm {it Kpp}} = 115 pm 7 , (stat.) ,^{+10}_{-9} ,(sys.)$ MeV, and the $S$-wave Gaussian reaction form-factor parameter $Q_{rm {it Kpp}} = 381 pm 14 , (stat.),^{+57}_{-0} ,(sys.)$ MeV/$c$, as a new form of the nuclear bound system with strangeness -- $K^-pp$.
101 - Johanna Stachel 2005
Data from the first three years of running at RHIC are reviewed and put into context with data obtained previously at the AGS and SPS and with the physics question of creation of a quark-gluon plasma in high energy heavy ion collisions. Also some ver y recent and still preliminary data from run4 are included.
The $Lambda(1405)$ production in p+p collisions at 3.5 GeV and K$^-$-induced reactions is discussed. The shift of the measured spectral function of the $Lambda(1405)$ in p+p reactions does not match either theoretical calculations for p+p reactions o r experimental observation in previous K$^-$-induced reactions. New experiments with stopped and in-flight $K^-$ are needed to study this initial state more in detail. The state of the art of the analysis is discussed.
High-statistics differential cross sections for the reactions gamma p -> p eta and gamma p -> p eta-prime have been measured using the CLAS at Jefferson Lab for center-of-mass energies from near threshold up to 2.84 GeV. The eta-prime results are the most precise to date and provide the largest energy and angular coverage. The eta measurements extend the energy range of the worlds large-angle results by approximately 300 MeV. These new data, in particular the eta-prime measurements, are likely to help constrain the analyses being performed to search for new baryon resonance states.
التعليقات
جاري جلب التعليقات جاري جلب التعليقات
سجل دخول لتتمكن من متابعة معايير البحث التي قمت باختيارها
mircosoft-partner

هل ترغب بارسال اشعارات عن اخر التحديثات في شمرا-اكاديميا