Masses and Internal Structure of Mesons in the String Quark Model

The relativistic quantum string quark model, proposed earlier, is applied to all mesons, from pion to $\Upsilon$, lying on the leading Regge trajectories (i.e., to the lowest radial excitations in terms of the potential quark models). The model describes the meson mass spectrum, and comparison with measured meson masses allows one to determine the parameters of the model: current quark masses, universal string tension, and phenomenological constants describing nonstring short-range interaction. The meson Regge trajectories are in general nonlinear; practically linear are only trajectories for light-quark mesons with non-zero lowest spins. The model predicts masses of many new higher-spin mesons. A new $K^*(1^-)$ meson is predicted with mass 1910 Mev. In some cases the masses of new low-spin mesons are predicted by extrapolation of the phenomenological short-range parameters in the quark masses. In this way the model predicts the mass of $\eta_b(1S)(0^{-+})$ to be $9500\pm 30$ MeV, and the mass of $B_c(0^-)$ to be $6400\pm 30$ MeV (the potential model predictions are 100 Mev lower). The relativistic wave functions of the composite mesons allow one to calculate the energy and spin structure of mesons. The average quark-spin projections in polarized $\rho$-meson are twice as small as the nonrelativistic quark model predictions. The spin structure of $K^*$ reveals an 80% violation of the flavour SU(3). These results may be relevant to understanding the ``spin crises'' for nucleons.Comment: 30 pages, REVTEX, 6 table

Colour Screening, Quark Propagation in Nuclear Matter and the Broadening of the Momentum Distribution of Drell-Yan Pairs

We calculate the broadening of the transverse momentum distribution of a quark propagating through nuclear matter. Colour screening plays a fundamental role in that it cuts off quark-nucleon interactions with soft gluons. The mean transverse momentum of the quark acquired along its trajectory, observed via Drell-Yan pairs, is related to it the ratio of the total inelastic meson-nucleon cross section it to the meson mean squared radius. Parameter-free calculations agree with the data.Comment: LaTex file, 7 pages + 2 figs (not included, available by fax) Heidelberg , HD-TVP-93-

A study of the pi^0pi^0 system produced in charge exchange and central collisions

A study of the $\pi^0\pi^0$ system produced in charge exchange $\pi^-p$ collisions at 38 and 100 GeV/c and in central $pp$ interactions at 450 GeV/c has been carried out. The $S$ wave has rather a complicated structure in both processes indicating the existence of several scalar resonances. The $f_0(980)$ and $f_0(1500)$ appear as dips at 1 and 1.5 GeV in the $S$ wave for charge exchange reaction, and as shoulders at these masses in the $S$ wave for central production. The production of the $f_0(980)$, $f_0(1300)$ and $f_0(1500)$ in the reaction $pp \to p_f\pi^0\pi^0p_s$ as a function of the $dP_{T}$ kinematical filter shows the behaviour differed from what has been observed for the undisputed $q\bar{q}$ mesons. An extra $f_0(2000)$ state is seen in the $S$ wave for charge exchange reaction as a dip at 2 GeV. Resonances with higher spins, $f_2(1270)$, $f_4(2050)$ and $f_6(2510)$, have also been studied. All the three mesons are produced in the reaction $\pi^-p\to\pi^0\pi^0{n}$ mainly via an one-pion exchange for small $-t$, whereas a natural-parity exchange domimates for large $-t$. The behaviour of the centrally produced $f_2(1270)$ as a function of the $dP_{T}$ is consistent with what has been observed for other $q\bar{q}$ states.Comment: 6 pages, 6 figures, use file stwol.sty, presented at International High-Energy Physics Euroconference in Quantum Chromodynamics, 2-8 July 1998, Montpellier, France on behalf of the GAMS and WA102 Collaboration

PERBEDAAN KENAIKAN MEAN ARTERIAL PRESSURE PADA PEMBERIAN CAIRAN KRISTALOID DAN KOLOID PADA PASIEN OPERASI ORTOPEDI

ABSTRAKOperasi ortopedi merupakan operasi yang memiliki kemungkinan terjadi perdarahan yang lebih tinggi dibanding yang lain. Penggantian cairan yang tepat dan cepat adalah salah satu cara yang dapat dilakukan untuk mengatasi ketidak seimbangan hemodinamik yang timbul akibat kehilangan cairan. Pilihan cairan yang bisa digunakan sebagai cairan pengganti adalah kristaloid, koloid dan darah. Penelitian ini bertujuan mengetahui perbedaan kenaikan Mean Arterial Pressure (MAP) pada pemberian cairan kristaloid dan koloid pada pasien operasi ortopedi. Penelitian ini merupakan penelitian analitik observasional dengan pendekatan cross sectional survey yang dilaksanakan pada bulan September-November 2014 di Kamar Operasi Instalasi Bedah Sentral Rumah Sakit Umum Daerah dr. Zainoel Abidin Banda Aceh. Jumlah sampel penelitian ini adalah 40 orang yang dibagi ke dalam dua kelompok yakni 20 orang kelompok kristaloid dan 20 orang kelompok koloid. Analisa data komparatif dilakukan dengan uji t tidak berpasangan. Hasil analisis komparatif menunjukkan kenaikan MAP pada pemberian cairan koloid lebih tinggi dibandingkan kenaikan MAP pada pemberian cairan kristaloid (p = 0,000).Kata kunci: mean arterial pressure, kristaloid, koloi

J/Psi and Psi' Suppression in Hadronic Matter

We present a microscopic calculation of the breakup cross sections of $J/\psi$ and $\psi'$ on pions and nucleons as a function of the kinetic energy. These cross sections are used for the investigation of the $J/\psi$ to continuum and $\psi'/J/\psi$ ratios in ultrarelativistic heavy ion collisions. The contribution of produced comoving pions to the $\psi'/J/\psi$ signal is calculated. While this model can account for the data, the uncertainties in the parameter values do not allow to exclude the possibility of additional sources for charmonium absorption, like a resonance gas or the quark gluon plasma.Comment: LaTeX, 6 pages including 2 EPS files, to be published in Prog. Part. Nucl. Phys., [email protected]

STILISTIKA DALAM NOVEL TERUSIR KARYA HAMKA

Penelitian ini menggunakan kajian stilistika yang bertujuan untuk mendeskripsikan penggunaan gaya bahasa dalam novel Terusir karya Hamka. Novel ini memaparkan cerita mengenai kesulitan hidup seorang istri akibat sang suami yang mudah termakan fitnah. Penggunaan gaya bahasa dalam novel Terusir meliputi, (1) gaya bahasa perbandingan, (2) gaya bahasa pengontrasan dan (3) gaya bahasa pertautan. Penelitian ini menggunakan deskripsi kualitatif. Pengumpulan data dilakukan dengan menggunakan teknik simak, catat, kemudian dianalisis. Hasil yang diperoleh mengenai gaya bahasa yang paling dominan dalam novel Terusir yaitu gaya bahasa hiperbola. Penggunaan gaya bahasa hiperbola yang ditemukan dalam novel ini sebanyak 14 data, gaya bahasa paradoks sebanyak 12 data, gaya bahasa simile dan sarkasme berjumlah 11 data, gaya bahasa sinekdoke 9, kemudian gaya bahasa yang paling sedikit ditemukan yaitu ironi dan simile yang berjumlah 4 data. Fungsi dari penggunaan gaya bahasa hiperbola dalam novel ini dapat memberikan kesan dramatis yang dapat dirasakan pembaca mengenai perasaan tokoh yang ada di dalamnya. Karena, jalan cerita dalam novel ini menceritakan mengenai kemalangan hidup yang dirasakan oleh Mariah. Penggunaan gaya bahasa hiperbola sangat membantu dalam menggambarkan bagaimana penderitaan yang dirasa oleh tokoh utama

MUSEUM GULA INDONESIA DI KABUPATEN BREBES BERBASIS TEKNOLOGI

Merencanakan suatu museum dengan konsep berbasis teknologi yang dapat mengedukasi sejarah ataupun teknologi itu sendiri, secara edukatif dan inovatif serta menciptakan bangunan yang memiliki citra yang baru dengan fasilitas-fasilitas yang interaktif didalamnya. Hal ini bertujuan agar dapat melestarikan peninggalan sejarah yang sudah menjadi cagar budaya yang ada, mengapresiasi teknologi karya bangsa sekaligus menambah wawasan masyarakat mengenai perkembangan industri gula, merancang suatu museum yang baru dan museum yang lebih segar sehingga memberikan pengalaman baru terhadap museum di Indonesia serta dapat meningkatkan minat wisatawan untuk mengunjungi museum

J/psi Production and Absorption in High Energy Proton-Nucleus Collisions

Measured J/Psi production cross sections for 200 and 450 GeV/c protons incident on a variety of nuclear targets are analyzed within a Glauber framework which takes into account energy loss of the beam proton, the time delay of particle production due to quantum coherence, and absorption of the J/Psi on nucleons. The best representation is obtained for a coherence time of 0.5 fm/c, previously determined by Drell-Yan production in proton-nucleus collisions, and an absorption cross section of 3.6 mb, which is consistent with the value deduced from photoproduction of the J/Psi on nuclear targets.Comment: LaTeX2e, 7 pages, 4 PS figures. Typos removed, minor change