PUBLIKASI - LEMBAGA ILMU PENGETAHUAN INDONESIA

Extracting visible s-channel Higgs in the lepton scattering

The contributions of $s-$channel Higgs in l^+ l^- -> q bar{q}$ processes in the general lepton collider (l^+ l^- collider) is studied. A framework to extract the contribution by using the experiment results from both electron and future heavy-lepton colliders at same center-of-mass energy is proposed. Deviations due to the $s-$channel Higgs contributions are analysed and discussed for the heavy-quark final states by using the cross-section and forward-backward asymmetry. It is shown that significant deviations are expected in the forward-backward asymmetry difference between the experiment results at both colliders for the top quark final state within the Standard Model frame. Selengkapnya

mu^+ mu^- Collider Physics

The author gives a brief explanation for the physics in the future mu^+ mu^- collider. In spite of the possibility of constructing the collider is very early age, it is shown that the physics are clear from beginning, Selengkapnya

Test of the chiral structure and FCNC in the quark sector by radiative B meson decays

We study the effects of a vector-like SU(2) quark doublet as a fourth generation. In this model we examine the chiral structure and the FCNC in the quark sector by using radiative B meson decays in the allowed region for parameters from R_b = {Gamma_{qq}}/{Gamma_{rm had.}}. We compute the ratio R = {Br (b -> d gamma)}/{Br (b -> s gamma)} in the model which realizes a different chiral structure as well as FCNC. The constraints has been extracted from the experimental results of B meson decays, the T_{rm new} parameter of oblique corrections and $R_b$. Under the natural assumption… Selengkapnya

Fisika Teori dan Aspeknya dalam Pengembangan Teknologi Tinggi

Kami membahas aspek-aspek sampingan yang timbul dalam pengembangan peralatan eksperimen dari fisika energi tinggi. Sebagai salah satu ujung dari ilmu pengetahuan yang berusaha menyimak rahasia alam semesta, fisika energi tinggi selalu menuntut usaha-usaha maksimal dari manusia untuk membuktikan teori-teorinya. Sebagai konsekuensinya, tuntutan tersebut selalu malampaui batas-batas kemampuan teknologi saat ini. Dilain pihak, hal ini mendorong adanya inovasi baru dalam teknologi terapan yang bisa diaplikasikan dalam kehidupan sehari-hari. Selengkapnya

Peranan Fisikawan Teori dalam Proses Peningkatan Sumber Daya Manusia

Dalam makalah ini kami mengupas kondisi fisikawan teori di Indonesia, sekaligus memberikan pandangan mengenai peranan fisikawan teori dalam proses peningkatan sumber daya manusia (SDM). Kami menunjukkan bahwa secara umum ilmuwan teori (dengan contoh fisikawan dan matematikawan) bisa, atau bahkan seharusnya mempunyai peranan mendasar dalam proses peningkatan SDM. Meskipun secara umum, ilmuwan teori sering dianggap kurang memberikan kontribusi secara langsung kepada masyarakat, hal mana menimbulkan pengertian yang salah terhadap keberadaan ilmu teori sebagai dasar dari ilmu terapan yang tidak bisa dikesampingkan begitu saja. Untuk menunjukkan hal tersebut diatas, kami memberikan contoh- contoh nyata didalam masyarakat dunia, khususnya di negara-negara berkembang yang… Selengkapnya

Power Corrections on Hadronic Spectra for B -> X_s l^+ l^- process

We use the techniques which first was developed in Georgi et.al. to estimate power corrections on hadronic matrix element for B -> X_s l^+ l^- process. Selengkapnya

A Model Independent Analysis for b -> s e^+ e^- Process

We make a prediction for the long-distance effects due to vector mesons to B rightarrow X_s l^+ l^- Process. The analysis is done by extracting the Wilson coefficients of the relevant operators in the effective Hamiltonian. In this context the analysis is applicable for many models which have 10 operators like the Standard Model. We show that a consistent solution is exist if the long-distance contributions are include. Selengkapnya

Effect of the Flavor Changing Neutral Current on Rare B decays

We study the effect of the FCNC on rare B decays in the beyond standard model with vector like singlet quarks. It has been shown that b -> s gamma does not receive sizable contribution compared with that of the standard model while b -> d gamma, b -> s(d) l^+ l^-, can be changed from the predictions of the standard model. Selengkapnya