Top-quark production in hadron-hadron collisions and anomalous top-quark-gluon couplings

被引:82
作者
Haberl, P
Nachtmann, O
Wilch, A
机构
[1] Institut für Theoretische Physik, Universität Heidelberg, Heidelberg, D-69120
关键词
D O I
10.1103/PhysRevD.53.4875
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We discuss the influence of anomalous t(t) over barG$ couplings on total and differential <t(t)over bar> production cross sections in hadron-hadron collisions. We study in detail the effects of a chromoelectric and a chromomagnetic dipole moment d(t)' and mu(t)' of the top quark. We estimate the values of d(t)' and mu(t)' which are allowed by the present Fermilab Tevatron experimental results on top-quark production in <t(t)over bar> collisions. In the mu(t)'-d(t)' plane, we find a whole region where the anomalous couplings give a zero net contribution to the total top-quark production rate. In differential cross sections, the anomalous moments have to be quite sizable to give measurable effects. A chromoelectric dipole moment of the top quark violates CP invariance. We discuss a CP-odd observable (O) over cap(L)$ which allows for a direct search for CP violation in top-quark production. We find that the presence of a chromomagnetic moment mu(t)' can influence the sensitivity of (O) over cap(L)$ to d(t)' considerably.
引用
收藏
页码:4875 / 4885
页数:11
相关论文
共 44 条
[1]   OBSERVATION OF THE TOP-QUARK [J].
ABACHI, S ;
ABBOTT, B ;
ABOLINS, M ;
ACHARYA, BS ;
ADAM, I ;
ADAMS, DL ;
ADAMS, M ;
AHN, S ;
AIHARA, H ;
ALITTI, J ;
ALVAREZ, G ;
ALVES, GA ;
AMIDI, E ;
AMOS, N ;
ANDERSON, EW ;
ARONSON, SH ;
ASTUR, R ;
AVERY, RE ;
BADEN, A ;
BALAMURALI, V ;
BALDERSTON, J ;
BALDIN, B ;
BANTLY, J ;
BARTLETT, JF ;
BAZIZI, K ;
BENDICH, J ;
BERI, SB ;
BERTRAM, I ;
BEZZUBOV, VA ;
BHAT, PC ;
BHATNAGAR, V ;
BHATTACHARJEE, M ;
BISCHOFF, A ;
BISWAS, N ;
BLAZEY, G ;
BLESSING, S ;
BOEHNLEIN, A ;
BOJKO, NI ;
BORCHERDING, F ;
BORDERS, J ;
BOSWELL, C ;
BRANDT, A ;
BROCK, R ;
BROSS, A ;
BUCHHOLZ, D ;
BURTOVOI, VS ;
BUTLER, JM ;
CASEY, D ;
CASTILLAVALDEZ, H ;
CHAKRABORTY, D .
PHYSICAL REVIEW LETTERS, 1995, 74 (14) :2632-2637
[2]   NEARBY DOORWAY STATES, PARITY DOUBLETS, AND PARITY MIXING IN COMPOUND NUCLEAR-STATES [J].
AUERBACH, N ;
BOWMAN, JD ;
SPEVAK, V .
PHYSICAL REVIEW LETTERS, 1995, 74 (14) :2638-2641
[3]   TEST OF CP-INVARIANCE IN E+E- -] Z(0)-]TAU+TAU- AND A LIMIT ON THE WEAK DIPOLE-MOMENT OF THE TAU LEPTON [J].
ACTON, PD ;
ALEXANDER, G ;
ALLISON, J ;
ALLPORT, PP ;
ANDERSON, KJ ;
ARCELLI, S ;
ASHTON, P ;
ASTBURY, A ;
AXEN, D ;
AZUELOS, G ;
BAHAN, GA ;
BAINES, JTM ;
BALL, AH ;
BANKS, J ;
BARKER, GJ ;
BARLOW, RJ ;
BATLEY, JR ;
BEAUDOIN, G ;
BECK, A ;
BECKER, J ;
BEHNKE, T ;
BELL, KW ;
BELLA, G ;
BERLICH, P ;
BETHKE, S ;
BIEBEL, O ;
BINDER, U ;
BLOODWORTH, IJ ;
BOCK, P ;
BODEN, B ;
BOSCH, HM ;
BOUGEROLLE, S ;
BRABSON, BB ;
BREUKER, H ;
BROWN, RM ;
BRUN, R ;
BUIJS, A ;
BURCKHART, HJ ;
CAPILUPPI, P ;
CARNEGIE, RK ;
CARTER, AA ;
CARTER, JR ;
CHANG, CY ;
CHARLTON, DG ;
CLARKE, PEL ;
COHEN, I ;
COLLINS, WJ ;
CONBOY, JE ;
COOPER, M ;
COUCH, M .
PHYSICS LETTERS B, 1992, 281 (3-4) :405-415
[4]   RIGOROUS QCD-POTENTIAL FOR THE (T)OVER-BAR-T SYSTEM AT THRESHOLD [J].
KUMMER, W ;
MODRITSCH, W .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1995, 66 (1-2) :225-239
[5]   SECONDARY LEPTONS AS PROBES OF TOP-QUARK POLARIZATION IN E+E--]T(T)OVER-BAR [J].
ARENS, T ;
SEHGAL, LM .
NUCLEAR PHYSICS B, 1993, 393 (1-2) :46-64
[6]   ENERGY CORRELATION AND ASYMMETRY OF SECONDARY LEPTONS IN E+E--]T(T)OVER-BAR [J].
ARENS, T ;
SEHGAL, LM .
PHYSICAL REVIEW D, 1994, 50 (07) :4372-4381
[7]   AZIMUTHAL CORRELATION OF CHARGED LEPTONS PRODUCED IN P(P)OVER-BAR-]T(T)OVER-BAR+... [J].
ARENS, T ;
SEHGAL, LM .
PHYSICS LETTERS B, 1993, 302 (04) :501-506
[8]   ANALYSIS FOR MAGNETIC-MOMENT AND ELECTRIC-DIPOLE MOMENT FORM-FACTORS OF THE TOP QUARK VIA E+E-]TTBAR [J].
ATWOOD, D ;
SONI, A .
PHYSICAL REVIEW D, 1992, 45 (07) :2405-2413
[9]   EXTRACTING ANOMALOUS GLUON-TOP-QUARK EFFECTIVE COUPLINGS AT THE SUPERCOLLIDERS [J].
ATWOOD, D ;
AEPPLI, A ;
SONI, A .
PHYSICAL REVIEW LETTERS, 1992, 69 (19) :2754-2757
[10]  
ATWOOD D, 1994, SLACPUB6580